Sony Repair Tips
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Results: 20072
Results: 20072
| Make | Model | Symptom | Problem | Solution | By |
|---|---|---|---|---|---|
| SONY |
KP53V45
RA2 |
Arcing | Kp53v45 unit has red tube that is arcing. | Tech calling in for red crt approval. crt is arcing in the neck. | Muller |
| SONY |
KP53S65
RA2 |
A.c. hum | Sony kp53s65. cust has two complaints. 1. unit has low level ac hum when using an external amp connected to the variable/fixed or the monitor outputs of the television. the hum is present when the volume on the tv is muted or set to minimum, and the volume of the external is turned up 20%. the hum is quite noticeable at this level. 2. when using the variable/fixed outputs the set will not have left channel output. | I had tech disconnect all connections (except to the variable/fixed output) to the rear of the set while in the condition mentioned in the first complaint. after all other inputs to the set was disconnected the catv connection was the only connection remaining. when it was disconnected the hum disappeared. this indicated the trouble is caused by a ""ground loop"" this condition is caused by the catv ground is a different potential than the rest of the equipment. this may not be able to be corrected without an electrician checking the customer electrical neutral and ground connections in the customer house wiring. we can simply solve the trouble by having the catv company installing a ""ground breaker"" in series with the catv feed. 2. the no output to the left channel output is caused by a torn trace at the left output connector for the variable/fixed outputs. "" | Muller |
| SONY |
KP46S25
RA1 |
Wrong color | The picture turns a reddish or pinkish cast after 20 minutes this is intermittent. pix flashes upside down then back to normal. this takes about 20 minutes but can be accelerated by heating the ic301 with a heat gun. | Defective jungle ic chip ic301 | Muller |
| SONY |
KP46S25
RA1 |
Vertical | Pix flashes upside down then back to normal. this take | Defective jungle ic301?. | Muller |
| SONY |
KP53S15
RA1 |
Smear | Kp53s15 unit has a green smear | When tapping on green crt the picture the picture will smear. tapping | Muller |
| SONY |
KP53V35
RA1 |
Shuts down | Sony kp53v35 ra-1. unit shut down as soon as set is turned on. tech ordered r865 and d814 because they were shorted after parts were installed a new symptom was evident. ""unit turns on but enters shutdown after the tube warm up. crt's get bright with ret "" | Unit had torn trace on e board that connects the 200 vdc line to cn708(7) which connects to the cr board. apparently the traces were accidentally torn in the process of moving the chassis around. repairing the traces corrected the symptom. | Muller |
| SONY |
KP61XBR48
RA1 |
Shutdown | Kp61xbr45 9034307 unit turns on but goes into shut down after raster comes on and the set has a bright screen with retrace lines. unit now has all three crt burned | Measuring the 200 vdc power supply the finds no voltage, unit has open r859. unit will need modification listed in bulletin 291r1 and 281r1 tech will need to correct the main problem then after corrected the crt will have to be | Muller |
| SONY |
KP61V35
RA1 |
Shutdown | Kp61v35. unit will turn on then go into immediate shut down tech has tried all the normal methods of isolating crt, hv block, loss of horizontal or vertical sweep disconnecting the 200 vdc power supply voltage from the red crt. all these circuits being disconnected still did not prevent shut down.. however the unit will still shut off right after high voltage comes up. | I needed tech to check the more of the not so common shut down sensors. these were d board protect line cn1757(7) , ""e"" board protect line cn851(5), and the ""a: board protect line cn222(4) i first had tech remove the crt sockets from each crt to prevent phosphor burns on the tubes. next remove the fuses on the ""d"" board and remove connector cn1757. then turn on the television. it turned on with high voltage and stayed on. this indicated the trouble was din the ""d"" board. a quick static test of all the post regulators ic1804(1), ic1803(1), ic1808(1), & ic1807(1) found that a short circuit to ground was indicating on the output of ic1804(1) this is the +5 volt regulator. checking through the board and lifting the bypass electrolytic capacitors on this line discovered a shorted c1832 a 330 mfd @ 16vdc "" | Muller |
| SONY |
KP53V35
RA1 |
Shutdown | Sony kp53v35. unit goes into an immediate shut down. unit will not turn on at all. unit will try to turn on but shuts off. | I had tech measure the b+ at the +135 and the -135 vdc power supplys. the -135 was not indicating any voltage. tsound is a 18Ω short to ground on the emitter of the horizontal output transistor. No having tech check into the horizontal pin amp and horizontal output transistor. if a short in this circuit occur when the set ha a picture it is very likely that crt damage has occurred. it is recommended the screen be removed or use what ever method available to check the crt faceplates for phosphor burns. if burned the crt will also need replacement. q510 and q509 shorted | Muller |
| SONY |
KP61XBR45
RA1 |
Shut down | Unit turns on but goes into shut down after raster comes on and the set has a bright screen with retrace lines. unit now has all three crt burned | Measuring the 200 vdc power supply the finds no voltage, unit has open r859. unit will need modification listed in bulletin 291r1 and 281r1 tech will need to correct the main problem then after corrected the crt will have to be | Muller |
| SONY |
KP53XBR45
RA1 |
Shut down | Unit had two crt's red and blue leaked on the original ""e"" board prompting their replacement. after changing the crt's and the ""e"" board it was discovered the set had a symptom of immediate shut down. "" | When checking ic901(1&13) and ic903(13) we had no positive voltages that would cause a high voltage protect shut down. at no time did we ever get high voltage or horizontal drive, for the high voltage output, q801. however q505, the horizontal driver for the horizontal output always had drive to it. when the first technician replaced the original circuit board it was discovered that he did not transfer the jumpers on cn804. tsound must be three jumpers on this connector otherwise the set will never get high voltage. cn804(1&2), cn804(3&4), cn804(5&6). unit needs these three jumpers to route the 2 abl circuits, .horizontal drive pulse. replacing these jumpers restored | Muller |
| SONY |
KP53XBR45
RA1 |
Screen | Sony kp53xbr45 unit has a streak across the top of the screen appears like the unit has a defective screen, or a scratch between the lenticular and fresnel lens. tech calling in for an authorization for screen replacement. | The defect as the tech explains showed up as a straight horizontal line at the top of the screen. it was a discoloration toward the color yellow when white is displayed. also on the lower corner was a dark circular pattern that did not match the curvature of the fresnel lens. i instructed the tech to inspect the entire optical light path for any defects. tech reported back to me the mirror had a smear completely across the surface area. possibly caused by a previous cleaning with a cleaning rag that has some oil based contaminate. gently cleaning the mirror corrected the fault. | Muller |
| SONY |
KP41T15
RA1 |
Raster | Kp41t15 unit is turning on. timer light flashes at turn on and set will have sound, but no raster. | Unit has no high voltage. ""e"" board is wet from glycol coolant leak from the red and blue crt's that are leaking red an blue tube "" | Muller |
| SONY |
KP61XBR48
RA1 |
Rainbow | Sony kp61xbr48. unit has rainbow colors in the lower right hand corner & when the power turned off using the power button on the television the set will not shut off. | Rainbow caused by the speaker wire casting a shadow in the light path from the projected image. tech needs to reroute wire. next tech will need to install a 2.2 mfd capacitor across the power switch. | Muller |
| SONY |
KP53S25
RA1 |
Osd | Kp53s25 unit will play then it will go to a slight green picture the channel displays will come on automatically | Checking the id codes in the set wee found all id codes correct except for id4 it was 64 instead of 80. resetting the code to 80 caused the set to loose raster and enter the video input mode. we let it do that and initialized the eeprom. everything operated correctly after that point | Muller |
| SONY |
KP46S15
RA1 |
No turn on | Kp46s15 unit will not turn on. at no time can a ""click"" be heard from the ""g"" board when the power is applied or when the power is turned on. "" | I had the tech measure the standby b+ at the input of ic652(1) the voltage should be 24 vdc. we only had 9 volts. checking with an oscilloscope we found 22 volts peak to peak on the input of the regulator. unit had defective c667 a 470mfd@ 35 vdc. replacing the capacitor corrected the | Muller |
| SONY |
KP53XBR45
RA1 |
No turn on | Sony kp53xbr45 unit is not turning on. | F601 & f602 are open. factory upgrade. replace c815, c897, 858, & 889 from a 1000mfd @ 35 vdc to a 470 md @ | Muller |
| SONY |
KP53V25
RA1 |
No turn on | Kp53v25 unit will not turn on. shorting the emitter and base of highvoltage output allows the h. drive to appear at the collector of the h. driver transistor. update: unit had bad flyback. anode lead will not come out of flyback. must replace lead link fro | Anode 1-900-211-34 short link for anode lead | Muller |
| SONY |
KP53XBR45
RA1 |
No raster | Kp53xbr45 serial # 9017298 unit has no raster. led in front is flashing. unit does have high voltage and sound. tsound is an ik pulse on the cathode of each crt but it is too high, over 90 volts pp. the g2 voltage is too low. | Checking the g2 voltage at each crt it was discovered it was only 82 volts on all tubes. the g2 wires to each tube were disconnected and measured the free end and it was still only 84 volts. the output from the flyback t801( mv) {supply voltage for the screen/focus block was 12,000 volts}. this is normal. disconnecting the (g2) wire that leads over to cn882(1) allows the picture to come on but the g2 supply only increases by a few volts. it has been determined by these tests that the focus/screen high voltage resistors | Muller |
| SONY |
KP53S25
RA1 |
No raster | Kp53s25. unit has no raster for 15 to 30 minutes. unit has high voltage and the timer led flashes for the normal 15 seconds then goes out. unit has sound, but no osd or pip. | It appears that the jungle ic ic301 cxa1477as may be causing this trouble. the we have luminance up to ic301(1) and osd at 19,20, &21 | Muller |