Sony Repair Tips
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Results: 20100
Results: 20100
| Make | Model | Symptom | Problem | Solution | By |
|---|---|---|---|---|---|
| SONY |
KP46S25
RA2 |
Wrong color | Kp46s25 serial 9026954 unit has no output from the blue crt. swapping the green to the blue socket does not transfer the trouble. | Unit will need the blue crt. g2 voltage running at 33 vdc. on blue crt | Muller |
| SONY |
KP61V75
RA2 |
Video | Kp61v75 se 9009906. the symptom on this screen is a strange artifact in the video next to fine detail objects. the artifact can be seen at times if a persons face is displayed and zoomed out to a distant image. the lips will can still be seen but to the upper left of the lips tsound is a bright white artifact in the shape of the lips. this can be seen on other images but this is the tech explanation of the symptom | I asked the tech to reproduce a stair step waveform on the screen. the stair step was to be interrogated very closely for any anomalies on the steps, or in the sync area of the signal. video looks great at the input of the pd board cn3401(6). but tsound are fine overshoots on each assendig steps of luminance on all steps measured at the ""y"" output cn3401(2). an overshoot on the 7.5 ire step is in excess of .4 volts. each after the first step has an over shoot on it the exceeds the previous step. this problem is being caused by the 3d combfilter or the pd board. tech needs to order the "" | Muller |
| SONY |
KV36FV1
RA2 |
Shuts down | Kv36fv1 unit shuts off immediately after turn on. measuring the collector voltage q502(c) finds it rises up then falls to zero. | I asked tech to remove q502(b&e) then measure q502 collector. after unit is turned on. it was at 135 vdc. q501(c) was at 77 vdc.. unit has horizontal drive at q501(c). this indicated the unit had horizontal drive. scope reading showed a 60/40 duty cycle at 63 microseconds. tsound are no apparent short circuits on secondary of flyback transformer. unit has defective flyback. | Muller |
| SONY |
KP41T35
RA2 |
Shutdown | Kp41t35 unit has blown ps601 and ps602 fuses. the tech replaced the convergence ic's and the fuses and powered up the unit again. it blew the fuses again. | Tech needs to check into the possibility that the convergence output are being rail to either side. of the power supply. the process of disconnecting the sub deflection yokes from the ""g"" board then power up the set will eliminate the possibility of a fuse blowing in the event that a convergence output ic is being railed to either power supply. tech also needs to check the bulletin # 344 related to reducing the value of 4 electrolytic in the convergence circuit, c858, c859, c815, c897. these must be reduced from 1000 mfd@ 25 vdc to "" | Muller |
| SONY |
KP46S25
RA2 |
Shut down | Kp46s25 serial 9000075 unit is shutting down the stand by voltage is stable during the stand by mode. before working on the television, it would cycle on and off. it had a bright glow at the top of the screen. now after the second tech worked on the unit the set shuts down immediately after turn on. | Tech forgot about a unusual symptom that if the set looses vertical sweep the television will cycle on and off as long as the antenna is connected. but if the antenna is disconnected the set will shut down immediately. this was the case for this unit ic1501 was shorted. also ps602 was open | Muller |
| SONY |
KP46C65
RA2 |
Screen | Kp46c65 this screen has been replaced 3 times. customer claims screen has a crack in the screen. this crack is in the same place as the last two times in the same set. | Tsound is no crack, but evidence that a liquid was smeared down the front lenticular screen which left 5 vertical bands of varying widths from 3 mm to 7 mm. the liquid pooled at the bottom of the screen and it migrated, by capillary action, behind the front screen to the rear screen (fresnel). the fluid followed the contour of the circular cut screen. this is the reason for the dark lines that appear in a ""u"" shape at the bottom of screen. this is clearly fluid damage and not covered by any warranty. customer does admit to using a ""diskwasher"" rear projection screen cleaner in a red spray bottle. according to the customer the original screen had the exact same type of damage, and so did the first replacement, wsound it was replaced after a few weeks wsound it was replaced again. this second tech warned the customer not to use any liquid cleaner on the screen. now this screen has obvious liquid damage. this is customer responsibility. "" | Muller |
| SONY |
KP41T65
RA2 |
Retrace lines | Kp41t65 serial 9531495. unit has a brought screen with retrace lines. | When measuring the cathode driver pin on the cg socket with it connected to the tube we found 36 volts. when disconnecting the socket the voltage rises to 177 vdc. unit has defective crt a-1501-372-a | Muller |
| SONY |
KP53V85
RA2 |
Retrace | Unit has bright screen with retrace lines. crt socket ""cr"" board has a hole burned through it. previous tech out simply ordered all three crt driver boards and the 3 crt's because of a burn in the center of the tube. "" | Tech has no 200 vdc power supply from the g board. the 1Ω resistor is open from the d520 200 vdc rectifier to the cr board. | Muller |
| SONY |
KP41T65
RA2 |
Retrace | Unit has a bright screen with retrace lines. | When measuring the cathode driver pin on the cg socket with it connected to the tube we found 36 volts. when disconnecting the socket the voltage rises to 177 vdc. unit has defective crt a-1501-372-a | Muller |
| SONY |
KP53S65
RA2 |
Pip | Kp53s65 serial 9141528. unit has a normal picture but it does not have luminance in the pip area. | The pip and comb filter assembly are in the ""pt"" module. cn5001(5) is the sub video input for the pip signal. however the cn5051(14) is the luminance output is missing. the u & v signalscn5051( 16 & 15) are present. (they are the red and blue portions of the pip signal) tech needs to replace the ""pt"" module part # 1-665-394-12 "" | Muller |
| SONY |
KV53V75
RA2 |
No turn on | Kv53v75 unit will not turn on. | I had tech check continuity on the ac line cord which would measure the resistance of the stand by transformer. continuity was 570Ω which is good. next the tech needs to measure the input of ic641 it must be 20 volts. it was. the output of ic641 was ""0"" this ic is a 3 legged linear regulator with a generic # of 7812. it should have had a 12 "" | Muller |
| SONY |
KP53V75
RA2 |
No raster | Kp53v75. 9057801 unit has no raster and cycling on and off every 2 seconds.. when turning up the g2 on any one of the crt's the crt will not have a complete raster but a glow that will be brighter on the top of the screen than the bottom. | This symptom is generally indicative of a vertical failure. i had the tech measure the + & - 15 vdc from the main power supply at ps601 & ps602. ps601 was open causing the -15 volts to be missing. however two weeks later we were out again to replace both fuses. customer claimed as before the set was working fine the day before and he turned it on in the morning and it failed to have raster. this indicated the fuses were opening at ""turn on"" rather than failing while watching the set. it was indicated by sony tsound was going to be a bulletin on this unit that reduced the size of the filter capacitors on the + & - 15 volt lines, all 4 electrolytics are reduced from 1000 mfd to 470 mfd @ 25vdc. these are c656, c657, c815, & c889. after replacement no more "" | Muller |
| SONY |
KP61V45
RA2 |
No raster | Kp61v45 serial 9000412 unit has no raster. unit appears to have high voltage but no filaments. | Tech needs to inspect the filament winding continuity at cn766(5 & 4) at the blue crt socket with all crt's disconnected this resistance should be around 1Ω. in this case the unit was 53Ω. i instructed the tech to check into filament winding and r569. quick check of q569 found it had increased in value to over 50Ω. it is supposed to | Muller |
| SONY |
KP53V75
RA2 |
No high voltage | Kp53v75 serial 9008493. unit is not turning on. the power supply turns on but it will not develop high voltage. | I asked the tech to remove cn501 from the ""g"" board and try starting the set up again. the set turned on and developed high voltage. tech did not follow instructions in the bulletin #396. this area was covered in detail in the class. unit has a shorted red crt and burned video driver ic on the cr board. tech will need the crt, and the red "" | Muller |
| SONY |
KP41T35
RA2 |
Lines | Kp41t35 unit has a symptom of an uneven pattern covers the entire screen. it consists of approx. 1/16th of an inch lines that are interlacing, kind of a basket weave look like. tech replace the flyback with no effect in the symptom. | This symptom is known as line paring. i sent tech information on the symptom that may lead him to the conclusion that the jungle ic is at fault | Muller |
| SONY |
KP41T35
RA2 |
Lines | Kp41t35 with lines in the pix, resembling arcing. tech saw this symptom several times in direct views and the solution has been the flyback. tech replaced the flyback and the divider block but still had the same symptom. it is the pattern covers the entire screen. the pattern consists of approx. 16th in lines that are interlacing, kind of a basket weave look. | The name for this symptom is called ""line paring"" it is most likely caused by the jungle ic. suggest the tech try the set in the video input mode and see if the symptom shows in that mode before any more parts are replaced. after a short test it was determined the problem is not caused by the jungle ic because the set ran flawlessly in the video input mode. this really can only have 1 cause which will be the tuner. it was not mentioned in the first assessment of the symptom that it also had a roaring in the audio at the time of the line paring of basket weave interference across the screen. unit had bad tuner "" | Muller |
| SONY |
KP53V75
RA2 |
Lines | Kp53v75 serial 9021573 unit has a vertical line in the middle of picture from top center left to lower center right side. | Removing the screen finds the main reflector mirror is fractured down the center of the glass. | Muller |
| SONY |
KP53V75
RA2 |
Intermittent no raster | Unit will run for days then it will go to no raster and no sound with stereo led flashing. | The stereo led flashing is not the typical led is to indicate the system control is waiting for a acknowledgement from the jungle ic. when this set goes into the failure mode it kills raster and sound but high voltage remains. closer inspection also finds the set has high voltage with horizontal and vertical deflection. tracing the sda & clk signals finds the clk is running 3.5 volts pp and the sda runs at 5.1 volts pp. while the tech was working on tv the picture came back on again and the clk line climbed to 3.9 volts pp. it never climbed to 5.1 v pp like the sda line. tech isolated all the plug in boards to try to get the clk to rise to 5.1. only when the tu101 was disconnected the clk line went to 5.1 volts | Muller |
| SONY |
KP41T35
RA2 |
Ghost | Kp41t35 serial 9102191 unit has ghost line across the screen. | Tech will need the ""pt"" board. noise artifacts are seen while looking at the y signal out from this board. "" | Muller |
| SONY |
KP53V75
RA2 |
Dead | Unit is dead. will not start up. just has the flashing red led on the front of the set. disconnecting the connector cn501( which removes the 200 vdc load created by all 3 crt drive modules) does not allow the set to turn on. | Tech did not measure any voltages on the ""g"" board. these must be confirmed before we can possibly know wsound to go looking for what might be wrong. it is possible nothing is shorted in the power supply and we has an open start up resistor in the base circuits of ic601. tech needs to check r609, r610, r611, r612. all are 220k and have been known to open causing a ""dead set"" condition. "" | Muller |