Dicas Reparação SONY
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KP46C70 RA3 | raster | KP46C70 serial 9001847 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 | pixelate | KP53V80 Unit will run fine for hours but color hues will changes and at times and the color will pixelate. Problem does not show up if the color is turned all the way down. The PIP is not effected the PIP color is normal.. | Since the trouble does not affect the B&W portion of the picture it was ruled out any failure with the IK circuitry. Also the PIP was unaffected so we ruled out the PIP module or the Jungle IC. The only logical answer was the 3D comb filter since the video is digitized and the resulted Chroma and Luminance converted back to analog again. This is about the only place where the chroma can become Pixilated. However the tech will probably need to change the ""A"" board. The set is less than 30 days old and the ""A"" board can be replaced under warranty. The set is covered under the SAYS program. Unit had a defective ""A"" board "" | Muller |
| Sony | KP53V80 RA3 | OSD | KV53V80 After the set is turned on the raster will appear as a bright screen with video. The brightness is intense and lacks contrast. The OSD menu is also missing | 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. Tech needs to order the spark gaps for each CRT module and replace the defective IK buffer. "" | Muller |
| Sony | KP61S70 RA3 | HIGH VOLTAGE | KP61S70 serial 9005015. Unit is not developing high voltage but has Sound. No secondary voltages from Main power supply | Recommend that the tech order the ""G"" board. Unable to provide part number. "" | Muller |
| Sony | KP61S70 RA3 | CONVERGENCE | KP61S70 serial 9007325 Unit is 1 day old. The customer claimed the set popped then the set lost convergence control for blue horizontal lines. This mean the vertical sub deflection circuit is malfunctioning | On this chassis all of the sub deflection yokes are protected by fuse links. The fuse for the blue vertical sub deflection is PS1506 an it's open. It is a 2 amp device. Part # 1-533-59311 | Muller |
| Sony | KP53V80 RA3 | BRIGHT RASTER | KV53V80 serial 9008877 After the set is turned on the raster will appear as a bright screen with video. But the brightness is intense. Tech replaced the ""A"" board which did not cure the symptom. The set does not have any OSD either "" | 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 feedback 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 "" | Muller |
| Sony | KP53V80 RA3 | BRIGHT RASTER | KP53V80 serial 9007644 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. | defective Q764 Is leaky | Muller |
| 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 |