Sony Repair Tips
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Results: 20072
Results: 20072
| Make | Model | Symptom | Problem | Solution | By |
|---|---|---|---|---|---|
| SONY |
KV32S22
AA-2 |
Retrace | Unit has bright screen with retrace lines then it will shut down. measuring the g2 supply finds nearly 420 vdc but the crt cathodes are running only 55 volts. disconnecting the crt socket causes the cathode power supply voltage to rise over 180 volts. | It appears the crt is loading down the cathode voltages. unit will need a replacement crt. | Muller |
| SONY |
KV27S22
AA-2 |
Retrace | Unit goes to a bright blue screen with retrace lines then shuts down. | Unit has a defective crt. when unit is able to turn back on again the set will sometimes be in the video input mode. | Muller |
| SONY |
KV32V25
AA-2 |
Raster | Unit had an arcing inside the flyback transformer. the tech replaced the transformer now the unit has a bright band at the top of the screen. the tech replaced the jungle ic without affecting the symptom | Tech noticed the +15 volt power supply was lower than expected. it was only 10 volts. it is not unusual. the voltage is normally 12 volts. what the tech missed is the -15. this voltage must be tsound in order for the set to have any vertical sweep. resistor for the -15 volt power supply from the flyback was open. d530 and r537 a 0.47Ω resistor. | Muller |
| SONY |
KV32S20
AA-2 |
Raster | When turned on the raster has a dim glow, with the top brighter than the bottom. the timer led in front flashes. unit has high voltage and sound. | When raising the g2 voltage it was discovered the crt had a uniform brightness wsound the top of the screen was brighter than the rest in the crt. it was also discovered the -15 was missing. tech needs to look at d530 and r537 a 0.47Ω resistor. | Muller |
| SONY |
KV27V22
AA-2 |
Raster | Kv27v22 serial # 8049735 unit has red screen with then no raster g2 voltage drops to 3 volts. tapping on neck of tube causes the picture to return to normal. tech could not duplicate the trouble again. after this the set ran fine. | Crt.. due to this symptom and the intermittent nature of the trouble i suggest that we replace the crt a68kzj50x | Muller |
| SONY |
KV36V15
AA-2 |
Purity | Kv36fv15 serial # 9026985 unit has in the lower left corner the tube has a sever convergence and purity error. | No magnets appear to have moved into a position that would this effect. it cannot be adjusted out. it has been determined the crt needs replacement. | Muller |
| SONY |
KV27S45
AA-2 |
Purity | Kv27s45 serial 8056889 unit has sever purity error in the lower right hand corner of the picture | The ""q"" distance has been severely compromised because the aperture grill has shifted. unit will need a replacement crt "" | Muller |
| SONY |
KV27S22
AA-2 |
Purity | Kv27s22 serial 8091271. after the unit is turned on and the picture is on tsound is evidence the degausser is still running for about 5 seconds after the picture comes on. tsound seems to be a 18 second delay before the degaussing relay unlatches. tsound is only a 10 second delay for the picture to appear after power up. | I don?t know what the latch time is for the degauser relay. i thought that it was a bit excessive. but even though the latch time is excessive the posistor thp601 should increase high enough in resistance to drop the degaussed current to minimum levels. the trouble was corrected by replacing the thp601 | Muller |
| SONY |
KV35S40
AA-2 |
Overglow | Kv35s40 unit has preglow at the instant the television is turned on. ?the preglow shows in the lower left and right hand corner and stays until the raster appears. | This phenomena is normal and is caused by the ik pulses that are produced at the instant of turn on. even thought the cathodes are not completely warmed up tsound will be a slight amount of beam current produced by just the ik pulses. since these pulses are at the top portion of the tube or on the curved funnel portion of the crt this symptom is common and is not considered a defect in the crt. | Muller |
| SONY |
KV32S40
AA-2 |
Power supply chirp | Kv32s40 8096389 customer complaint is when the set is turned off tsound is a slight noise "" zip"" noise from the flyback transformer that lasts for about 2/10 of a second. the customer replaced the first sony for this trouble. but the symptom was also in this tv too. the customer tried two of the same models, and claimed they did not sound this noise when they heard it at the store. "" | This noise is normal due to the fact the set does not shut off the main b+ from the main smps. what is turned off is the 9 volt power supply from ic642 in the ""g"" board. as the voltage decays the tsound may be a slight phase shift in the horizontal drive signal as soon as the 9 volts begins to drop. the reason the customer could not hear this symptom in a store is due to its acoustics. the store is far noisier and carpeted walls and floors. in the customers home the set sits in an enclosed oak cabinet (no doors) in a bedroom with tile floors. one can sound a pin drop in this room. this set is operating "" | Muller |
| SONY |
KV35V36
AA-2 |
Pip | Kv35v36 unit has no control over pip channels. the pip only displays the main channel. it will not change on its own | I asked the tech go through the id codes for this unit and see if they were the correct value. id3was 10 id5 was143 & id6was 0. these were wrong. the id codes are supposed to be from id0 ~ id7 = 25, 55, 47, 10, 155, 6, 0. after resetting the id codes the set operated the pip correctly but still needed to set the pip chroma phase | Muller |
| SONY |
KV32XBR50
AA-2 |
Pincushion | Kv32xbr60 unit has narrow picture and hourglass distortion | Q505 shorted and r571 open | Muller |
| SONY |
KV27S22
AA-2 |
Picture interference | Sony kv27s22. serial 8126359 the sound is increased to a 60 to 80% level the crt will exhibit an effect on the sides resembling a ""water fall"" effect. it disappears if the audio is muted or if the audio level is dropped down to a lower level. "" | This symptom is called 'acoustical vibration."" it is caused by the sound energy from the speakers coupling acoustically through the crt frame to the aperture grille inside the crt. the vibration causes the aperture grille assembly in the tube to vibrate. suggested customer use external speakers "" | Muller |
| SONY |
KV36FS12
AA-2 |
Noisey video | This television had sever noise resembling black & white random lines of varying lengths. no discernable picture. noise is in the tuner and video and modes. | Checking the video at the input of the comb filter ic3504(2) on the rear i/o circuit board. the video is perfect. however the luminance out ic3504(9)is broken into pseudo square waves that are random in size and shapes. this indicated the combfilter was not working. further checking discovered the fsc ic3504(37), which is a 3.58mhz carrier was reduced to a 60hx pulses. at cn271(15) we found the fsc signal normal. problem was an open trace between the connector cn274(15) and c3578 located inside the combfilter shield located at coordinates c2 on the uy board. | Muller |
| SONY |
KV32V25
AA-2 |
No video | Kv32v25 unit has no video when using the front input jacks. all other inputs are o.k. | When tracing the video signal from the front input connector we find good video on the connector but less than an inch away from the connector is a coupling capacitor c2233. apparently the trace was torn after the video input jack entered the board. placing a hard jumper wire from the jack to the c2233(-) corrected the fault. | Muller |
| SONY |
KV32S22
AA-2 |
No raster no sound | Kv32 unit has a horizontal line across center of the screen. the line is elevated above center by 2 inches. tsound is no sound too. no led's in front are blinking | This symptom is inductive of a problem in the data or clock bus. measuring the scl & sda i found the scl was running at 1 volt peak to peak and the sda was at 4.97 volts pp. i had the tech start pulling all of the stand up boards out of the mother board to isolate the sda & scl lines. after the main tuner was removed the scl returned to normal. replacing the main tuner corrected the trouble. | Muller |
| SONY |
KV20VM20
AA-2 |
No raster | Sony kv20vm20 unit has no raster but sound and osd are o.k. | Unit did not have any horizontal blanker pulse to pin 19 of the jungle ic. shorted z1403 unit had 60 peak to peak at the ""fp"" of flyback. at cathode of z1403 should be 7 volts peak to peak. replace diode and restored normal operation. "" | Muller |
| SONY |
KV32V40
AA-2 |
No raster | Kv32v40 unit has no raster. when g2 is increased the unit has a non uniform bright screen, brighter at the top of the screen. the television has sound. | Cure: checking the +12 and -12 volts at ic561(2&4) respectively are normal. monitoring q561( c) it was only 1.7 volts (wsound it should be about 3 volts), and q561(b) was 0.6 volts( wsound it should be ""0"" volts).. the voltage at q562(b) is always low (0.11volts). by pulling the base q562(b) high, with a dmm in the diode check mode, we are able to get full vertical sweep. it appears tsound is no, or poor pulse coupling between the fb pulse u561(3) and q562(b). a strong pulse is present at u561(3) when grounding q561(b). no pulse at c564(+) tech needs to replace c564 1mfd @ 50 volts was "" | Muller |
| SONY |
KV32S65
AA-2 |
No raster | Kv32s65 serial 8014809. unit has no raster. sound o.k.. led on front panel flashing. it also does have high voltage. | I had tech measure the g2 voltage at the crt. it was only 54 volts. with the socket disconnected the g2 voltage returns to 410 volts. unit has defective crt. crt must be replaced a80jyv52x | Muller |
| SONY |
KV32S25
AA-2 |
No raster | Kv32s25 has no raster. when the g2 is increased the set has a partial raster but brighter at the top of the screen then the bottom. measuring across the vertical yoke windings we find tsound is a voltage of approximately 8 volts. these is sound and channels can be selected. | The symptom indicates the set has a vertical deflection failure but more precisely a power supply failure for the _15 volts power supply. the tech either has a open r536 = .47Ω @ or open d530. . | Muller |