If you replaced D1410 in the audio circuit, also replace Ic140 the audio amp and your set will power up once again.. Check for vary fine ring cracks around the driver transistor, driver
Trang 1stopped powering up. I found a shorted diode in the audio section and replaced that. Now the set powers up but without any picture at all. Sound is fine. The picture tube and the associated drivers look fine, but there is no video signal. Tracing back, I see the video jungle chip
isn't putting out anything but it looks like it does not have the
proper
inputs. Tracing further, it looks like there is something amiss on the
"P4" board which is the COMB filter. Service manual shows a part number
1195065 for the board, and the board has both 1195054 and 1195045 stamped on it. The schematic for the board does not match the circuit
on
my version of the board, so I cannot really troubleshoot at the
component
level. The two ICs on the board are discontinued Sony parts. I would like to replace the board but Sony says they do not carry a replacement anymore
If you replaced D1410 in the audio circuit, also replace Ic140 the audio amp and your set will power up once again. Strange but true! In the future when looking for help always give the part numbers that you have already changed, it makes it easier to look up the repair.
QUESTION: Sony KV27TS27 TV. After working for a month since
the first replacement of Q601 and 602 including the h.o.t. Q502, they broke down again. I checked all of the surrounding components and they all measure o.k. I replaced the parts and the set played for one week then failed again. The supply to the set is 123 V AC. How sensitive
no picture. Voltages are about 60% lower than normal. 200V is around 90V
There is a .47uf cap in the horizontal drive circuit (on the base of driver?) that can cause this problem.
Trang 2More than likely R607 a .1ohm 1/2 watt res. is open. Also check q603.
QUESTION: Sony KV20TS27 TV. All channels show static for at
least 5 minutes in colder weather. Higher range (50+) available before lower range. Video in appears unaffected. Tuner replacement or bad connections? If tuner, source?
Connections within the tuner, you may try removing the tuner and
resoldering all the ground tabs connecting to the case from the pcb and checking for any other suspicious connections. Tuners available fron Fulton Radio Service in Lansing, MI.
QUESTION NO. P12159: Sony Trinitron KV32TS36 TV the original owner
stated if a fan blowing on it from the back was on it would keep the
picture. I found a loose solder connect at the C board. I replaced the
solder and it was fine for about 6 months. It came back with the picture
going on & off frequently. I removed the cover again noticed the same
when I plug in the set I can hear the protect relay click. Also when I
power the set by means of the power button, the protect relay engages and
the set shuts down (0.5 sec). I rechecked the components I
replaced and
they are still good. Also is there a way to test the FBT?
A good FBT ringer can be used to check the fbt without actually replacing
it. Check for vary fine ring cracks around the driver transistor, driver
transformer, horiz output transistor and FBT. Also any of the other
components in the H deflection may need to be checked. A X 10 or more
magnifier may be needed to see the ring cracks. Seems to be a common
problem. Does the horiz output or FBT get quite warm when you try
to start
Trang 3QUESTION NO. P11309: Sony kv27ts27 TV has perfect picture but w/out
sound when coax cable is hooked up to the back. But when VCR or DVD is
hooked up using audio/video cables, the set works perfectly (w/ sound +
picture)
Look for small green circuit board labeled sbx1637xx. Probably has leaky
capacitors. DO NOT attempt to repair, just replace. Available as generic
C1906 on 1.602.172.11)
C1902 is a 330pf @2kv capacitor. Sony p/n is 110232700
QUESTION NO. P1233: Sony KVM14U TV. I need the value of and power
rating of resistor R852? The one I've removed has lost its color bands,
and used to glow orange when in circuit! ;(
The first anode (G2) voltage was low at 190V and R852 was
smoking. D852
was leaky (Sorry, I don't know the type) and R852 1k ohm was burnt out.
Fitting replacements restored the G2 to 880V
QUESTION NO. P11181: Sony 27XBR10 TV. B+ is down to 4 volts. There is no
HV, and there is a loud, highpitched whine. I have 167 volts at the
output of D601. I am trying to figure out how the feedback loop works.
There is .4 volts across the IC652 LED, and Q651 is cut off. When Q651 is
cut off, is that supposed to make IC651 increase or decrease the transformer voltage? Is there a data sheet for the STRS6301A available?
Which is the primary of the transformer T651? Pins 5 and 8, or pins 2 and
3? This is the second time the set has failed with the same symptoms. I
didn't fix it last time. The guy said he replaced the power
supply. I
presume that means the F board, but I don't know for sure. The
Trang 4operated normally for several months after the first repair. Just before
it failed, it would occationally drop HV for a couple seconds. Suspect the regulator ic, also check the horiz driv transformat and
flyback for very small ring cracks. You will need a good
magnifier to see
them, probably even a loupe. I would go with the ic and do the connections
for sure
QUESTION NO. P9228: Sony KV27HSR10 TV. The horiz freq is too high. I
replaced ic301, the only voltage off is on pin 30 of ic301. It is 3.9v
instead of 3.0v. Incoming hori sync pulse are clean
I suspect the surface mount resistor/about the same location where you got
your horizontal sync. pulses. It is a 1/8 watt surface mount with a value
of 1.8k ohm. But I would advise to use a magnifying glass.
Please note
that is on the upright board beside your jungle IC. Remove the board that
has horiz. sync. pulses on it and you should find it . It may have a 183
written in tiny print/or similar
QUESTION NO. P8182: Sony kv32xbr26 TV, what kind of voltage should I get
on the flyback terminal (low voltage side)? Is it ac or dc? When I try
effectively infinity. Take the diode out of the ckt @ check both fwd and
rev readings. The other end of the coil in the FBT is probably grounded.
If there is a low resistance load on that particular supply you will read
it rather than the true condition of the rectifier
QUESTION NO. P9142: Sony KV20XBR TV has no output from the speaker
jacks. Power amps seem fine, I suspect that perhaps in the
service menu,
Trang 5way to select speakers off
Check the bias voltages to the audio ic and for cracks in the solder
connections where the speakers [leads & connector] physically connect to
and audio input. But when cold, no tuner image or sound. After
30
minutes or so, tv works fine in tuner mode. Sometimes tuner works for 23
first, before I can get back to the original problem. Right now I only
heard the relay 'click' after turning it on with no sound &
picture
Fulton Radio Supply in Lansing, Michigan is a Sony authorized distributor,
I know that there are others. Scope the drive signal from the ic, thru the
driver, to the gate of the output to see where the jitter and tearing is
coming from
Sanken's STRS6301A is available from B&D Enterprises (8004586053) and
MCM (8005434330), among others. One could also sub ECG/NTE 7046
QUESTION NO. P7268: The convergence of Sony KP46S55 (4 years olds) is
bad after the TV was turn on for approximately 10 minutes. The blue color
is horizontally displaced to the left about 2 inches. The cross
Trang 6convergence adjustment were merged to form a perfect vertical white line.
The horizontal line is also white except about a half inch at both ends
have the yellow/orange colors
I troubleshot the pincushion problem and found out one of the three power
amps in the IC1704 was internally shorted to 16V at its output (pin #10).
This explains why the fuse 902 was blown. Also the blue
convergence
problem was caused by the lose solder at pin #24 of IC 1705
QUESTION NO. P7217: Sony KV32S15 TV has sound but no picture (including
OSD). High Voltage is OK. Video OK to CRT and I can hear
Horizontal sweep
circuits. Voltage at pin 5 of CRT should be 460 volts and is 175. Pins 7
and 8 of the CRT are at zero volts (DC to ground). Schematic shows 200
volts (on each?). 135 volts at TP91 is correct
I have since found the problem. R701 (680K) is in series with the screen
voltage control and was open
Additional note to Sony television service tip, had similar
problem with
KVKV 27exr10, difference was that the tv would come on and play correctly sometimes for about one hour and THEN the screen image would
become black for the first 1/3 of the picture or the first 4/5 of the
picture. Problem could be mistakenly diagnosed as a vertical deflection
problem
QUESTION NO. P7206: Sonykv27ts27 TV, cannot select between tuner and
actual true color in each corner of screen. The rest of the screen is
offcolor, fleshtones are highintensity greens, for the most part.
Rotating the unit does not change the spots intensity. However,
Trang 7compensation magnets in various locations around the tube will extend the
correct color areas out a bit. Is the tube hashed?
Have you tried a tube degausser? Usually random color spots are caused by
a stronger magnet that was too close to the tv, ex.stereo
speakers. If a
degausser works turn set off and back on. If the colors are still gone
you are fine. But if they came right back check your fround loop strap
that circles the back of the tube. Check for cracked solder
joints where
the loop plugs into the board also. If the colors do not go away or the
tv looks like it has been dropped, the tube most likely has gone bad or
horizontal circuit and power supply circuits. Fuse is not blown and
flyback and yoke checked for their respective resistance
according to the
schematic values, OK . No visible signs of cracks or bulging in the
flyback and or any electrolytic capacitors . Lifted the B+ to the Horizontal circuit and the clicking stopped and you hear the two relays
click on with low but clear sound from the TV program the cable box is
tuned to. Have checked the circuit starting from the B+ was
lifted all the
way to the end (Flyback transformer output) and cannot find any defective
parts. Found one odd thing in the audio output section, where a transistor 2sa1309a has a 30v at the emitter and 29.3v at the base,exactly
according to the schematic did not have a voltage of 29.9v at the collector , it measured 0.7v but when I pulled the transistor out
of the
circuit it checked good with the ohmmeter. Also found the voltage
at the
Power converters (Q601 & Q602) emitter and collector respectively high as
compare to the schematics value of 160, it measured 227V
Trang 8converter for the cause of too high voltage at Q601/2. Check voltages/supplies derived from FBT for s/c. Ring FBT. Replace supect
2sa1309a but check collector circuitry for s/c and drive to base
QUESTION NO. P6225: SONY KV32xbr50 TV. Fuse is okay. The relay clicks
when applied power. Set dead, no functions, no high voltage. Replaced
IC651 (strs6301A), set worked for 1 minute. Then main fuse
opened. Ic651
short between pins 123. Replaced IC651 again, along with C654, C613,
C652, Q604,Ic652 and q651. Set worked for 1 minute, 135 volt is
ok (when
set was working). the original IC561 is strs6301A. I wonder if strs6301
(without the letter A at the end) will work
STRS6301A is the replacement for STRS6301, and was designed to withstand
to be killed by heat in only one minute's time, when properly heatsinked,
IF there are no other faults
QUESTION NO. P671: Sony KV27s25 TV with sound but no picture.
It
seems to have high voltage for a split second but then HV shuts down. I
believe the set is going into current protection since the high voltage
shutdown circuit is not being turned on
Possible the regulated B+ to the sweep circuits are too high or the caps
in the horiz yoke return ckt have changed value. Also make
absolutely sure
the connection at the flubask and driver transformers have been cleaned
and resoldered. These connections have been a cause of many a quirky
problem
QUESTION NO. P6710: Sony KV27V36 TV. Replaced the flyback and H.O.T.
Now the set will not power up. There is 160v but no low voltage.
Trang 9transistor, and
flyback. Thourghly clean the leads of the components and the ckt board
where they mount and reinstall them. Ring cracks at the fbt and driver
transformer have been causing a large amount of these types of failures
QUESTION NO. P646: Sony KVM2120E TV, power supply B+ too high,
135 v
and it should be 119 v. I checked and replaced all the caps on the ps,
the regulator STR54041 and the fbt
Are you certain the B+ from the regulator is initialized at 119 and not
135? Seen a lot of Sony teles and the normal B+ seems to be around
130,135. Try the set on a good variac and lower the input so your B+ is at
119 and see how the set functions. I will wager the set will have reduced
width. Bet you have another deflection related prob
QUESTION NO. P5267: Sony KV27TS27 TV that developed muffled, flat
audio. It used to resolve itself after 30 to 60 minutes, but now
it does
not. Treble and bass adjustment with remote have no effect. Also, CRT
elements are now arcing the length of tube neck every 30 to 120 seconds
which sometimes shuts down set. Are these problems related?
No, crt problem not related to audio symptom. New crt should fix arcing
problem, MTS assembly or processing ic should take care of audio problem
QUESTION NO. P5176: Sony KV27V55 TV. No picture no sound,and
no power.
Found Q602, Q601 and Q591 Hout shorted. R607 open. Replaced Q601,Q602,Q591,VDR602, VDR603, R607 and Flyback Trans. Worked for 1 hour
and then made a loud snap, same problem again
You did not mention if the replacements semiconductors were
original Sony
Trang 10specific areas. Also, check the small red capa in the smps and derived ps
circuits. Check for poor solder connections at the horiz driver transistor, transformer, horiz damper diode, horiz output, and flyback
Remove old solder from flyback transformer and horizontal drive transformer and resolder. Apparently Sony had a service bulletin
on that
problem a while back. Also, if VDR's checked bad, check R644 and Audio Out
IC. And finally, resolder anything that looks suspect in
horizontal drive
and output circuits. This should prevent all those expensive parts blowing
again
QUESTION NO. P5131: Sony TV 32XBR25, no picture, no sound, no high
voltage. When the tv is plugged in, the relay RY601 turns on and off.
All the components in the power supply check ok, same in the high voltage
Check the vertical output circuit, the pincushion circuit, and the video
output devices. Any of which can cause the set to sense a problem and
initialize protect. Also, if the crt has a problem, aka arcing or intermittent interelement shorts, it will destroy the video outputs and
cause shutdown
QUESTION NO. P5107: Sony kv32s26 TV, has sound, high voltage but no
picture and the power led blinks
Check the video output devices [3] and the vertical sweep ckts. Occasionally the crt arcs that can fry the output devices. When the
protect senses the defective video device it will not allow the set to go
into full operational mode
QUESTION NO. P486: Need value for R568 for Sony KV2020E TV. Value of resistor is 18Kohm 1/4watt Taken from Sony KV2720
manual
QUESTION NO. P3225: Sony kva3411 d. The television is giving
a red
spot in the left uppercorner because of a magnetic field. If I move a
magnet on the top of the television a can get the spot away. If
Trang 11the television (on wheels) through the room the spot disapears or some
green spots in the other side of the screen apear. I walk around the with
a portable colortv (philips)and nothing changes on that screen. Are there
magnetic fields in the room that interfere on the big screen model?
Your answer is yes. You may have to realign the purity on the crt
QUESTION NO. P41510: Sony kv27v10, dead. q601,q602
powerconverters,
2sc4834 shorted, r607.1ohm open. Checked, vdr's, ic601, dm48and parts
associated with convertes,voltage accross r607at70vac i.2ma but relay
starts clicking,at 120vac sounded like h.v. came up. Rung
f.b.t.ok,
removed horizontal output transistor, relay still clicking, b+ going from
80vdc to135vdc
Check: Q601 (872901951), Q602(872901951), R607(120293361),
R644(121285361), IC2200(871998043)Audio Out IC, VDR601(18072881),
VDR603(181005321). If R644 is open, check VDR's and audio out
IC,
along with the shorted parts. If horizontal output transistor is shorted,
also remove solder from horizontal drive and flyback transformers and
get them?
Many Sony distributors will be helpful to techs when they have the Sony
part numbers already. Here are a few possible US distributors. East
coast, Standard Electronics (800)3331519; Southeast, Tritronics (800)3658030, (800)6383328; Midwest, Fulton Radio (800)2480898; South,
Eagle Distributors (800)7265930; West Coast, Andrews Electronics (800)2890300
Trang 122SC4834. Resistor R607 open, one ohms. Replaced parts, now just clicking
relay
Bet they fried again! Check the horiz output transistor for shorts,
remove the solder from the fbt and driver transformers and
resolder.
Replace the defective semiconductors using original Sony parts. Check the
little red or blue caps in the SMPS for cracks and replace same. Check: Q601 (872901951), Q602(872901951), R607(120293361),
R644(121285361), IC2200(871998043), VDR601(18072881), VDR603(181005321). Check R644. If open, replace VDR's and is good
idea to also replace IC2200 along with rest of above parts. Also check
horizontal output transistor for short. Remove old solder from horiz
drive transf and flyback and resolder
QUESTION NO. P3266: Sony KVX2521U TV. Has partial vertscan collapse,
it is very nonlinear, the bottom 10% of picture is missing and black, and
the top 20% is stretched with the middle shrunk to the equivalent
of 16/9.
It is worse at switch on but does not improve much with warmup. The fault
is getting worse with time. I have resoldered all the suspect joints
Defective electrolytic capacitors in vertical deflection and possible im
but it is an odd size
QUESTION NO. P3229: Sony kv27v10, relay was clicking then went dead. B+
out of main bridge, nothing at the collector of 2sc4834mnp
Fault Clicks onoff, then goes into shutdown. Replace Flyback (#145314621). I have not personally experienced this
particular fault
on this chassis, but if you have a flyback checker, maybe a ring test will
Trang 13transistors. I would like to replace these with Sony original parts. Will
the original parts prevent this problem from coming back? Also C609 and
C611 (with the no. 224 printed on them) were burned from debris coming
Q602 (C4834), C611 for leakage (224nf). Also replace cap next to C611,
which I believe is C609 (224nf also). I do not know cap part#'s offhand.
After replacing parts, remove solder from flyback and hor dr transformer
and resolder. Resoldering these particular components is VERY important.
Apparently Sony had an update on this some time ago
QUESTION NO. P255: Sony kv32xbr10, The image is stretched on the top
the selected channel. I have resoldered all pins and components related
to the video IF module (VIF201). I also resoldered all the
components in
this module and replaced the IC inside. What stops the correct frequency
hunting is to spray inside the module with freeze mist. It will
Trang 14stable and in freq as long as it is maintained cold
Readjust the if section, The aft adjustment is off, you may also have a
bad cap in the aft circuit
Replace the complete assembly with a new one from Sony. Obvious there is
something intermittant within the unit that you have missed or can not
repair. Cease the fustration and replace the unit
QUESTION NO. P1203: Sony KV32HSR10 with a vertical problem, there is a
full deflection, but at the top and bottom 1 quarter of the
screen there
are missing scan lines. Hard to explain, but it looks like extra dark
lines on the screen. Replaced IC500, c502,c555,c501. The sam's
2821 I
think has some errors. On Pin 6 of Vertical output IC says 30V PkPk but
read about 2.8V. Voltages look ok around IC500
Resolder C546 on pin 5 of IC500 (vertical output IC), check out IC1504
(12V regulator) on D board
QUESTION NO. P215: Sony RPTV model#KP46S15, the red "bleeds" to the
right from time to time, does not seem to be temp related. It appears to
be horizonal only. The convergence board has been replaced. It only does
it sometimes and not usually very long
Change the contrast settings and see if bleeding only happens at high
contrast and brightness settings. This is a quick way of checking the
crts. If the bleeding is more severs only at high contrast and brightness
settings you may be fairly sure the crts are getting a bit weak. QUESTION NO. P11910: Sony KV 19TR20. No color, just
concentric rings
of yellow / blue/ red . Picture / sound fine. The volume bar used
to be
green , now is red. PS has a cracked board around the tuner, works if
properly positioned!
CRT is damaged
QUESTION NO. P1226: Sony KV27V55 television that shuts down on
Trang 15intermittent basis. Sometimes it shuts down after the set is on for 20
minutes, sometimes after it is on for many hours. CRT goes green and thump
is heard in audio when set shuts down. Two presses of remote control or
the set's power switch turns set back on. All voltages checked and are OK.
Any suggestions before we tear down the set further?
Bright green with retrace? Possible that either the CRT is
shorting
intemittantly or something in the gy circuit is awry. When the set goes
green the protect is probably shutting it down
QUESTION NO. P171: Sony KV27XBR51 Intermittent operation. Blank screen
with raster no sound. Loud noises and loud distorted sound during change
to normal operation. Ocassional high voltage arc
Check Sony sound module, a common failure. Discard from the set and
replace with 2 caps.(50volt 4.7 uf) pin 12 put + of each ,and pin
10, pin
11, for ). This module causes a lot of symptoms (it is for sap, not
needed in many countries) or you have it on your VCR and save about
$70.00
QUESTION NO. P1142: Sony KV27V55. The screen has shifted
downwards
slowly. It started small, now it is about an inch wide. Cannot see any
visible signs and no diagrams either
Direct view Sony with one color shifting? Sounds as if the static convergence magnets, on the crt neck, have been misadjusted. The purity,
and convergence adjustments are done with the three concentric rings
behind the yoke assembly. Spot areas are adjusted using 'spot' and 'wand'
type magnetic material and yoke wedges. Shifting of a particular color,
without affecting the others, may be a problem within the crt itself
QUESTION NO. P1132: Sony 15sxtrinitron powers up, tube lights,
no
video, no visible component failure
Check for ring cracks @ the on board regulator ics. Also for a
Trang 16of the smps feeds to the tuner, video, audio cks
QUESTION NO. P187: Sony 35xbr48 with a light shadow arc in the upper
right. The arc is only visable on white, light blue yellow
solids and
from all sources. Degauss done, no effect. Adjusted picture and electronic
focus, no effect
Make absolutely sure there are no magnetic items, speakers, large power
amplifiers, etc. near the tele. Have the degauss circuitry
checked. Have
the set manually degaused, have a signal generator connected to adjust the
purity and check tracking low to high light conditions. Some of these
adjustments may require the set being serviced by a qualified repair
person. Make sure the person adjusting the set has the available time to
is a 4 pin IC not to be confused with a 78M09 which is 3. Anyone have a
cross, source, or data sheet?
Sorry, you will have to order the part from Sony. Their engineers are some
of the best in the world of electronics, however, they do like to design
some propreitry parts too
QUESTION NO. P1243: Sony KV27TS31 TV. It had intermittent sound and
now the sound is almost gone. You can hear some distorted sound
at
highest volume setting. Both stereo channels are bad so I do not suspect
anything past the AUDIO controller (IC431). Also, all voltages
on the
IC431 seem ok. I have tried to plug an audio amp into the audio outputs
and they are also bad. When I turn mute on, all sound goes off completely. Trying to trace back, I am stuck here
Trang 17Replace Sony #874637120 with generic # BX163711, located on one of the
vertical mounted sub modules with RCA input jacks
QUESTION NO. P11103: Have a Sony 27" TV (KV2781R) that turns on after 10
flyback transformer or the horizontal transistor
Sounds as if you have a regulation problem, definetely not FBT. Look for
Isolate the pin from the buss to allow the buss to go low. If the line
does not go low when the IC pin is disconnected, you know the problem is
from another source. If the sound returns [ buss goes low] when removing
the MPU pin form the buss, the problem most likely is in the MPU. QUESTION NO. P11108: I recieved a Sony TV Model# 1981R, which has a
vertical foldover problem and also looses picture periodically.
I have
checked all the electrolytics in the vertical section and they measure
fine. I did discover that when I tried to adjust the vertical bias
control, by just touching it the picture goes to raster, and if I work it
alittle it comes back. The part is RV505 Vertical bias control 33K mfg
Trang 18potential
problem component, and if so does anyone know where I might get a 33K Trim
Pot part# 123063211 or has anyone come accros this type of problem
before on a Sony ?
It is possible that you have numerous poor solder connections in the area
of the control you are physically adjusting. Also, nonlinear sweep
suggests defective active or passive components in the vertical sweep
circuits
QUESTION NO. P11123: I have a Sony TV KVX2962U that has a line (made
up of one scanline each of R, G and B) running right across the top of the
screen. As it appears just above the picture it can be shifted up off the
screen using the service mode but in 169 it's very obvious and intrusive
Possibly what you are seeing is the VITS signals that are
broadcast during
the vertical blanking period. Adjust the vertical size to a point where
the lines and vits are no longer available for viewing
QUESTION NO. P10239: Sony 27" Color Receiver Model KV27S35, Chassis No.
SCCJ71GA. This unit has high voltage (22KV), filament to CRT, audio is
fine; but no raster
Concentrate on IC351. It has been known for strange problems. QUESTION NO. P1123: I am working on a Sony KV 2764 FE TV. A few
minutes after powering up, the image and sound disappear. Only the video
input allows to have an image and sound. I have checked the AGC and the
memory, OK. I tried the cold spray and hot air but no effect. Where can
I search the problem?
I see most Sony TV's fail due to bad grounds in either the tuner
or the IF
module, that little subassembly next to the tuner. Usually, but not
always, rapping either will resolve which one has the trouble. I usually
Trang 19QUESTION NO. P10297: I have a Sony 27" KV27TS27, Mfg date 10/91. Audio
is emitting a high pitched noise. The louder the volume, the louder the
noise. It is not the speakers, externally wired speakers do the same.
Audio is occasionally muffled and takes time to come through. Approximate
part cost?
You need to replace the IF module. The part # is on the shield. This model has a common problem with sound bad of all natures, as all
models using the sound module SBX 163711. Available at Dalbani, Mcm or
most part stores
QUESTION NO. P1029: I am working on a Sony TV KV27ts27 that came in with
a power supply problem, resistor and diode fried. I replaced the components. The picture now comes up but is very dark. I do not have a
remote for this set and am wondering if it is just a menu
adjustment of
brightness and contrast. Is there any way to access the internal settings
without a remote (or should I suspect another problem)?
You need to get the remote for the set. It is the only way to access the
menu
QUESTION NO. P10231: I have a Sony model kv1973r that has
distorted
audio half way through the volume range. Speaker is fine and solders are
ok too
Check the Power Supply Capacitors. The value of them/it should be 1,000/20,000uF and 25/75 volts
QUESTION NO. P10134: I have a Sony KVA2922U (approximately
1992
vintage) with no vertical deflection on power up. Have reseated connections to yoke. Cannot see a service switch inside. Any tips?
Failure in vertical deflection circuit or supply power circuit to
Trang 20Suspect vertical output devices and electrolytic capacitors in vertical
circuit
QUESTION NO. P1081: I have a Sony (PAL) TV, type KV2581 and I need to
enter the Service Menu to make some adjustments
Sony RA Chassis service mode may be entered by the following sequence of
buttons on the Sony remote. Switch the receiver off, press
display, 5,
volume up, and power within one second of another. Set should come on with
a menu display. Buttons 1 & 3 select register to be modified, buttons 2 &
4 select the data value. To write changes to the registers, press
8 and
enter button and power off. Suggestion, write down the original data
values before changing so you can return to them if necessary. QUESTION NO. P9289: I have a Sony KV2063 which can run without problems
voltage regulator and the Protection Module with no success. I am beginning to think that the micro is acting up. Has anyone had a similar
experience and what can be done about it?
Very good probability, also check the memory ic. Also, look for possible
solder cracks in the area of the micro, specifically associated with
grounds, reset, and source
QUESTION NO. P9239: I have a Sony TV model kv32S22 with
intermittent
trouble. The set will run three hours, sometimes five or more, then shuts
down. Hitting the power button will return set to normal again.
I have
checked for bad connections, resoldered any in question, replaced error
amp detector on power supply board. Monitored supply as well. Changed
flyback with oem, changed video / chromra processor ic, monitored beam
Trang 21one hour starts doing it again. I tried calling Sony at their
900 # but
can never get through. I am lost on this one, any help?
Your Sony is acting just like one I had in the shop. Finally found a bad
connection from the circuit run to the solder pad by taking a stick and
pushing down on the board all over the place, tapping on
components and
moving them around. I tried cold spray to no avail. These are hard to find
and takes time
QUESTION NO. P8271: Sony KV1440E's power supply is screaming, even when
disconnected from load. Before that, the set was smoking but cannot find
any burned components
Check for shorted diodes and dried up electrolytics in the power supply.
The screaming you hear is probably due to one or both conditions being
met
QUESTION NO. P984: I have a Sony 68cm CTV model number KV
2966AS. Line
driver STRS5741 blown. Does that mean I have a short somewhere up stream?
Perhaps a transformer with a short to earth OR a dud Capacitor? Probably just the regulator ic took a dump, seen it before.
tranzistor. TV was functional about 1 month and back again with same
tranzistor exploded. I have checked components around but
without
success. I have replaced tr. and after 1 month same story. Any idea?
You did not state that you used exact Sony replacement parts or generic?
Try the original Sony part, also check for possible leaky caps in filtering checks
Replace control ic 601
QUESTION NO. P864: TV Sony Model KPR41EXP95 have horizontal
Trang 22bottom of picture and the begining (left) of lines looks like many
haftSine wave form. It is not problem of tuner. May be caused by some
capacitor? Any ideas?
Vertical, pincushion, convergence, then guess. Probably not a power
related problem
QUESTION NO. P7249: Sony 27" with number KV27XBR50. The sound disappears
from time to time. When present it is clear and loud (the amp ICs seem to
be OK). It is probably something small but tricky
Check for a small pcb housing many smd electrolytic capacitors. ESR each
cap until you locate the defect. Also, some of these units
developed
cracks in the ground shields of the tuner and mts assemblies which may
supplier of factory parts. These parts are still available. from Sony but
require a long wait. Keep in mind these older Sonys need to have exact
replacements (no subs.) or the set goes into meltdown (believe me). While
you're at it, double check the damper diode (this usually fails when a
h.o.t. shorts) and order the exact replacement. Check associated nearby
components tied in with the h.o.t. as well. Check your B+
regulator
transistor also for damage or leakage. Check the horizontal osc. and drive
transistors. Perform resistance checks from h.o.t. lead to ground
so there
are no heavy current paths. I know this sounds like a lot of work but
these old Sony types are finicky when the horizontal out fails
Trang 23ANYTHING left unchecked will assuredly pop your new replacement. Rarer
yet, sometimes the high voltage wire to the anode goes bad and needs
replaced. I usually plug the set into a variable ac supply and bring up
the voltage slowly!, watching the current consumption and monitor the 18v
power rail as well. I know this seems like quite an effort but, very
necessary on old Sony's, even the factory recommends these
procedures.
Good luck I don't envy you ( I'm still working on an old Sony pro
monitor which is full of grief!)
QUESTION NO. P6184: I have a Sony KV27SXR10 Television which exhibits
intermitent loss of luminence. The picture will turn dark red after a few
minutes of operation and can be returned to normal by striking the set.
This solution has recently lost its effectivness for the owner. Hence, a
faulty solder join is suspected
Look for broken solder connections at the regulator ics mounted
on the
center aluminum heat sink, towards the front of the chassis. Common
problem
Find and resolder the main video delay line. On some versions the video
board is mounted on the left side of the cabinet (facing the back)
QUESTION NO. P689: I am working on a sony kv2162m9 tv. It works fine for
about 30 sec, then the horizontal transitor or d613 blows. Just before
crashing there is a arcing sound from the power supply area.Could
it be
the PS transformer t602? I have ruled out the yoke and H.V. transformer
you hear. The voltage in the B+ power supply in normally not high enough
Trang 24
QUESTION NO. P6102: I have 2KV27V55 (chassis SCCF84HA) in for repair.
After replacing Q601, Q602 & r607, they failed again in less than
a
minute. Horiz out xsist is ok. Can someone would share their troubleshooting procedure for this power supply?
First, use Sony original transistors for the choppers. Also, check for a
thermistor in the secondary of the supply that ocasionally fails. Generally. replacing the two transistors and fuse resistor with original
parts normally sufices. Once in a while the thermistor also
causes a
problem along with a leaky diode in the secondary. We have been repairing
these sets in the field for some time with apx 98% completion rate. For
troubleshooting, the use of generic transistors is fine but we always put
Sony components into the sets before returning to service
QUESTION NO. P4172: I have a Sony KV2092 tv which
intermittently loses
the tuned station on some of its channel numbers. What should I suspect?
Check for bab solder on the IF Coils and also on the ground tabs around
the IF circuit. You can also see the plugs that make the
connection
between the main and the IF Board
QUESTION NO. P41510: Sony KV32XBR35 no power blown F602, R623. Any
advice?
Check both switching transistors in smps circuit, check horiz. output
transistor. Normally the smps switches short and open the fusable resistor. Replacing them may get this unit operational, however,
if the
horizontal output also is shorted you may have a defect in the fbt or
deflection circuits or derived supplies
QUESTION NO. P429: I am trying to repair a Sony Model KV1882AEB (chasiis
SCC573AA) This set has a prgrammable tuner. It appears to
program ok but
once power is removed the tuner loses its programmed channels. I was under
Trang 25not find any battery on the schematic. I have a feeling the
problem is a
bad CX7959 Sony Memory chip. Can anyone give me some thoughts on this
problem also need a current address/ telephone # for the Sony westcoast
Parts center
Yes. Your problem is most likely the memory ic cx7959. As for west coast
distributor Sony has a service/training center in Costa Mesa Calif.I do
not have the telephone number however I suggest calling 18005551212
directory assistance for an 800 Sony listing and go from there. QUESTION NO. P415: Does anyone know how to get into the service mode of a
Sony KVT29MN81?
Check for a small hole on the back panel of your tv. Puch a nonconductive
device thru that hole and press select switch to activate service mode
QUESTION NO. P3303: I have a Sony TV model # KV32S25 which came
in dead.
I replaced Q601, Q602, R607, in power supply and Q502 (horizontal output).
The set now powers on but has no high voltage, sound and tuner functions
ok. The high voltage seems to pulse on for a few seconds then disappears
HV Protect or B+ is going to high causing HV shutdown. Have you tried
disconnecting the hv from the crt & seeing if shutdown occurs then?
Carefully PLEASE! May even be a fault in FBT
QUESTION NO. P3237: I am working on a Sony kv27ts32 q601, q602 pwr conv
are shorted r607 and r644 are open. replaced same parts and
transistors
shorted and resistors opened. has anyone encounted this problem and its
cause
Use original SONY PARTS. Check the Horizontal Output Transistor,
if
shorted you may also need a flyback. Also check for defective parts in
secondary of main smps
I had the same thing happen on an XBR version. Turned ou to be a
Trang 26be able to see the 3 pulses at the IK output from the CRT board and note that the amplitude will grow or shrink depending on the screen setting. If one color is missing then you have an amp circuit problem for that color
If none of the pulses are there and they go in from the jungle IC then look for a bad IK amp transistor. If the pulses are there but do not very with changing screen voltage the feedback to the jungle IC or the IC itself is
bad. Some times the jungle IC has small Mylar caps off of it and if there they have been known to short. Sometimes the caps are built into the jungle IC and can still short
Many times the IK circuit just goes out of tolerance meaning the current drawn by one crt is no longer with
in acceptable range and the picture is blanked. If this is the case then increasing the screen voltage will solve,
Trang 27Fix: Do a hard reset, with set off press display, 5 vol+ power. then press mute & enter so save.
Trang 28SONY KP53XBR35
Pincushion Problem: Q508 PinOut Xstr Failed Or Runs Hot
Check For Poor Solder Connections On The Two Large Caps, C510 And C512,Located Near The Pin Out Transistor. Look Closely Where The Feed Thru'S ForThe Caps Solder To The Surrounding Pc Trace
SONY KP53XBR35
Turns On And Powers Down Immediately
Customer Complained Pix Got Smaller And Now Powers Down At Turn On. 135Present At C Of Q508 But Not B Or E. Check For 29k Between C Of Q508 And B
And R515 (18k 1/4w)
R515 Was The Worst, The Old Resistor Measured 56k. The Picture Filled OutAnother 10" Total Horizontally. The Pin Amp Q508 Is Still Running Hot ButThe Voltages On Q508 All Are Within A Volt Of What The Service Manual SaysThey Should Be
Trang 29bad on a lot of Sony sets
QUESTION NO. P3238: Sony KV32V26 TV picture cuts out very randomly
(almost seems to happen on high humidity days here in CT).
Sometimes a
week or two goes by between failures. When working, the picture quality is
perfect. When failure occurs, front poweron red LED either blinks (and
relay clicks) or is solid on. Also when failure occurs video input mode
switches to video 2 every time (which is set up as VHS input).
In failure
mode, if poweron red LED is blinking, I power TV set offthen on and set
Cleaned HV and anode areas. Noted that red HV wire is routed correctly.
Seems like HV is cutting out. When it fails I see a momentary horizontal
line before relay clicks and input switches to video 2
Check for poor soldering at the horiz driver transistor,
transformsr,
horiz output transistor, flyback, and coupling componento to the
Trang 30Seen a lot of very fine hairline cracks at the driver and fbt on some of
I will replace str54041. I do not have a variac, can I build it?
Purchase a variac, do not attempt building one, safety and
isolation
problems in home brews. Try placing a 100 watt lamp in series with the B+
to the deflection. Probably the regulator is the problem
QUESTION NO. P2116: Sony kv27xbr50 TV, after 15 minutes to 3 hours it
shuts down. There is no set time thus making it hard to test. Check for multiple inferrior solder connections in area of
Replaced both, now set runs but there is a 60 cycle hum, the 135 volt
transformers. Also for defective caps in the power supply, esp the small
blue ones
QUESTION NO. P211: Sony KV21R1D TV picture and audio are ok. When I
switch to Teletextmode only the frame appears, but no Teletextpage. Is
that a hardwareproblem or only in the setup of the TV?
Probable hardware problem. Does the set work in the closed
caption modes?
Make sure that modes are properly set. CC/TT decoder problem
Trang 31distortion of data signal coming in from source
QUESTION NO. P1104: Sony KV32XBR95S TV had a good picture, until it
stopped powering up. I found a shorted diode in the audio section and
replaced that. Now the set powers up but without any picture at all.
Sound is fine. The picture tube and the associated drivers look fine,
but there is no video signal. Tracing back, I see the video jungle chip
isn't putting out anything but it looks like it does not have the proper
inputs. Tracing further, it looks like there is something amiss
on the
"P4" board which is the COMB filter. Service manual shows a part number
1195065 for the board, and the board has both 1195054 and 1195
045
stamped on it. The schematic for the board does not match the circuit on
my version of the board, so I cannot really troubleshoot at the component
level. The two ICs on the board are discontinued Sony parts. I would
like to replace the board but Sony says they do not carry a
replacement
anymore
If you replaced D1410 in the audio circuit, also replace Ic140 the audio
amp and your set will power up once again. Strange but true! In the
future when looking for help always give the part numbers that you have
already changed, it makes it easier to look up the repair
QUESTION NO. P1256: Sony KV27TS27 TV. After working for a month since
the first replacement of Q601 and 602 including the h.o.t. Q502, they
broke down again. I checked all of the surrounding components and they
all measure o.k. I replaced the parts and the set played for one week
Trang 32to turn on. Eventually, it took up to 30 minutes or more, and then
totally quit coming on at all. I found a defective surge
resistor (220
ohm/25W), and a shorted horizontal output. Now there is a wavy green
channel display and volume display when activated. The sound is
OK, but
no picture. Voltages are about 60% lower than normal. 200V is around
damaged. I replaced them with no succes. The relay on the set comes in
when I plug in the set and then drops off again. When I try to start it
through the power button same thing. I checked the entire power supply and
everything is o.k. I checked all the components I replaced again and
they are still O.K
More than likely R607 a .1ohm 1/2 watt res. is open. Also check q603
QUESTION NO. P12162: Sony KV20TS27 TV. All channels show static for at
least 5 minutes in colder weather. Higher range (50+) available before
lower range. Video in appears unaffected. Tuner replacement or bad
connections? If tuner, source?
Connections within the tuner, you may try removing the tuner and resoldering all the ground tabs connecting to the case from the pcb and
checking for any other suspicious connections. Tuners available fron
Fulton Radio Service in Lansing, MI
QUESTION NO. P12159: Sony Trinitron KV32TS36 TV the original owner
stated if a fan blowing on it from the back was on it would keep the
picture. I found a loose solder connect at the C board. I replaced the
solder and it was fine for about 6 months. It came back with the
Trang 33going on & off frequently. I removed the cover again noticed the same
when I plug in the set I can hear the protect relay click. Also when I
power the set by means of the power button, the protect relay engages and
the set shuts down (0.5 sec). I rechecked the components I
replaced and
they are still good. Also is there a way to test the FBT?
A good FBT ringer can be used to check the fbt without actually replacing
it. Check for vary fine ring cracks around the driver transistor, driver
transformer, horiz output transistor and FBT. Also any of the other
components in the H deflection may need to be checked. A X 10 or more
magnifier may be needed to see the ring cracks. Seems to be a common
problem. Does the horiz output or FBT get quite warm when you try
to start
the set?
QUESTION NO. P11309: Sony kv27ts27 TV has perfect picture but w/out
sound when coax cable is hooked up to the back. But when VCR or DVD is
hooked up using audio/video cables, the set works perfectly (w/ sound +
picture)
Look for small green circuit board labeled sbx1637xx. Probably has leaky
capacitors. DO NOT attempt to repair, just replace. Available as generic
C1906 on 1.602.172.11)
Trang 34QUESTION NO. P1233: Sony KVM14U TV. I need the value of and power
rating of resistor R852? The one I've removed has lost its color bands,
and used to glow orange when in circuit! ;(
The first anode (G2) voltage was low at 190V and R852 was
smoking. D852
was leaky (Sorry, I don't know the type) and R852 1k ohm was burnt out.
Fitting replacements restored the G2 to 880V
QUESTION NO. P11181: Sony 27XBR10 TV. B+ is down to 4 volts. There is no
HV, and there is a loud, highpitched whine. I have 167 volts at the
output of D601. I am trying to figure out how the feedback loop works.
There is .4 volts across the IC652 LED, and Q651 is cut off. When Q651 is
cut off, is that supposed to make IC651 increase or decrease the transformer voltage? Is there a data sheet for the STRS6301A available?
Which is the primary of the transformer T651? Pins 5 and 8, or pins 2 and
3? This is the second time the set has failed with the same symptoms. I
didn't fix it last time. The guy said he replaced the power
supply. I
presume that means the F board, but I don't know for sure. The set
operated normally for several months after the first repair. Just before
it failed, it would occationally drop HV for a couple seconds. Suspect the regulator ic, also check the horiz driv transformat and
flyback for very small ring cracks. You will need a good
magnifier to see
them, probably even a loupe. I would go with the ic and do the connections
for sure
QUESTION NO. P9228: Sony KV27HSR10 TV. The horiz freq is too high. I
replaced ic301, the only voltage off is on pin 30 of ic301. It is 3.9v
instead of 3.0v. Incoming hori sync pulse are clean.
I suspect the surface mount resistor/about the same location where you got
your horizontal sync. pulses. It is a 1/8 watt surface mount with a value
Trang 35Please note
that is on the upright board beside your jungle IC. Remove the board that
has horiz. sync. pulses on it and you should find it . It may have a 183
written in tiny print/or similar
QUESTION NO. P8182: Sony kv32xbr26 TV, what kind of voltage should I get
on the flyback terminal (low voltage side)? Is it ac or dc? When I try
effectively infinity. Take the diode out of the ckt @ check both fwd and
rev readings. The other end of the coil in the FBT is probably grounded.
If there is a low resistance load on that particular supply you will read
it rather than the true condition of the rectifier
QUESTION NO. P9142: Sony KV20XBR TV has no output from the speaker
jacks. Power amps seem fine, I suspect that perhaps in the
service menu,
if there is one, that the audio may be turned down or perhaps there is a
way to select speakers off
Check the bias voltages to the audio ic and for cracks in the solder
connections where the speakers [leads & connector] physically connect to
and audio input. But when cold, no tuner image or sound. After
30
minutes or so, tv works fine in tuner mode. Sometimes tuner works for 23
minutes when I first turn it on, then fails and comes back after
30
minutes
Trang 36heard the relay 'click' after turning it on with no sound &
picture
Fulton Radio Supply in Lansing, Michigan is a Sony authorized distributor,
I know that there are others. Scope the drive signal from the ic, thru the
driver, to the gate of the output to see where the jitter and tearing is
coming from
Sanken's STRS6301A is available from B&D Enterprises (8004586053) and
MCM (8005434330), among others. One could also sub ECG/NTE 7046
QUESTION NO. P7268: The convergence of Sony KP46S55 (4 years olds) is
bad after the TV was turn on for approximately 10 minutes. The blue color
is horizontally displaced to the left about 2 inches. The cross lines for
convergence adjustment were merged to form a perfect vertical white line.
The horizontal line is also white except about a half inch at both ends
have the yellow/orange colors
I troubleshot the pincushion problem and found out one of the three power
amps in the IC1704 was internally shorted to 16V at its output (pin #10).
This explains why the fuse 902 was blown. Also the blue
convergence
problem was caused by the lose solder at pin #24 of IC 1705
QUESTION NO. P7217: Sony KV32S15 TV has sound but no picture (including
OSD). High Voltage is OK. Video OK to CRT and I can hear
Horizontal sweep
circuits. Voltage at pin 5 of CRT should be 460 volts and is 175. Pins 7
and 8 of the CRT are at zero volts (DC to ground). Schematic
Trang 37volts (on each?). 135 volts at TP91 is correct
I have since found the problem. R701 (680K) is in series with the screen
voltage control and was open
Additional note to Sony television service tip, had similar
problem with
KVKV 27exr10, difference was that the tv would come on and play correctly sometimes for about one hour and THEN the screen image would
become black for the first 1/3 of the picture or the first 4/5 of the
picture. Problem could be mistakenly diagnosed as a vertical deflection
problem
QUESTION NO. P7206: Sonykv27ts27 TV, cannot select between tuner and
actual true color in each corner of screen. The rest of the screen is
offcolor, fleshtones are highintensity greens, for the most part.
Rotating the unit does not change the spots intensity. However, placing
compensation magnets in various locations around the tube will extend the
correct color areas out a bit. Is the tube hashed?
Have you tried a tube degausser? Usually random color spots are caused by
a stronger magnet that was too close to the tv, ex.stereo
speakers. If a
degausser works turn set off and back on. If the colors are still gone
you are fine. But if they came right back check your fround loop strap
that circles the back of the tube. Check for cracked solder
joints where
the loop plugs into the board also. If the colors do not go away or the
tv looks like it has been dropped, the tube most likely has gone bad or
been damaged internally
QUESTION NO. P685: KV 27xbr37 TV shut down, only repeated