Dicas Reparação SONY
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KP53V80 RA3 | BRIGHT RASTER | KP53V80 serial 9004624. Once the set is turned on the raster will appear as a bright screen with video but the brightness is intense. There are no retrace lines. The set does not have any On screen display, sound OK. | Monitor the cathodes of each CRT at the instant of turn on. All cathodes were close to 186 volts. But as soon as the raster appeared the voltage dropped to 89 volts. This indicates the CRT's are in saturation. During this test the 200 volt source was still is running nearly 200 vdc.The IK lines are causing this problem. Measuring the IK line at the ""CG"" board at CN731(1) we measured 5 volts DC as soon as we turned on the set. After the picture appeared the voltage did not change. (NOTE: on a working set this voltage should be near Zero volts as long as there is ""0"" beam current. Each cathode had a normal IK pulse of 38 volts. The IK Buffers on each board are very hard to get to so another plan was develped to check these devices. The following transistors are the IK buffers Q733{CG board} Q764{CB board} & Q706{CR board). They are hidden by a heat sink for the Video output transistor. This unit had a leaky Q733. "" | Muller |
| Sony | KP53V80 RA3 | BRIGHT RASTER | KP53V80 Serial 9000364 Once the set is turned on the raster will appear as a bright screen with video but the brightness is intense. There are no retrace lines. The set does not have any On screen display, sound OK. | Q733 defective | Muller |
| Sony | KP53V80 RA3 | BRIGHT RASTER | KP53V80 9001186 Unit goes to a bright screen then the set may shut down or just operate with an extremely bright picture but no retrace lines. Unit has no ""ON Screen Display"" and the sound s OK "" | Monitor the cathodes of each CRT at the instant of turn on. All cathodes were close to 186 volts. But as soon as the raster appeared the voltage dropped to 89 volts. This indicates the CRT's are in saturation. During this test the 200 volt source was still is running nearly 200 vdc.The IK lines are causing this problem. Measuring the IK line at the ""CG"" board at CN731(1) we measured 5 volts DC as soon as we turned on the set. After the picture appeared the voltage did not change. (NOTE: on a working set this voltage should be near Zero volts as long as there is ""0"" beam current. Each cathode had a normal IK pulse of 38 volts. The IK Buffers on each board are very hard to get to so another plan was develped to check these devices. The following transistors are the IK buffers Q733{CG board} Q764{CB board} & Q706{CR board). They are hidden by a heat sink for the Video output transistor. This unit had a leaky Q706. "" | Muller |
| Sony | KP53V80 RA3 | BRIGHT RASTER | KP53V80 Serial 9012671 Once the set is turned on the raster will appear as a bright screen with video but the brightness is intense. There are no retrace lines. Tech replaced the ""A"" board which did not cure the symptom. The set does not have any On screen display, sound OK. "" | This unit had a leaky Q706 | Muller |
| Sony | KP53V80 RA3 | BRIGHT RASTER | KP53V80 Serial 9008991 Once the set is turned on the raster will appear as a bright screen with video but the brightness is intense. There are no retrace lines. . The set does not have any On screen display, sound OK. | Q764 was defective | Muller |
| Sony | KP53V80 RA3 | banding | KV53V80 serial 915183. Unit has banding of bright areas across the screen that becomes larger as the set plays. | This phenomena is caused by one of the IK buffers on the CRT driver boards. The condition should be treated by replacing All IK buffers and replacing the Spark Gaps The following transistors are the IK buffers Q733{CG board} Q764{CB board} & Q706{CR board). They are hidden by a heat sink for the Video output transistor. Tech needs to order the spark gaps for each CRT module and replace the defective IK buffer. IK buffer number is 8-729-200-17 and the spark gap is 1-517-729-31 Locations for Spark gaps are | Muller |
| 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 there 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 there 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 | SHUTSDOWN | 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. There 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. | There 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, where it was replaced after a few weeks where it was changed 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 source from the G board. The 1 ohm 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 |