Dicas Reparação SONY
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KV27V40 BA4 | all snow | KV27V40 Unit will not change channels. The number changes but the set will only display a all snow image. Tech replaced the tuner and it did not solve the symptom. | Tech needs to check the SDA And SCL lines to the tuner. When the set is on the Clock line at the tuner has a pulse but the SDA is Low. No data pulses. Unit had a scratched trace leading to the tuner assembly/ Jumpered trace and tuner now runs correctly. | Muller |
| Sony | KV32V40 BA4 | acoustal vibration | KV32V40 serial Unit has an acoustical vibration on certain frequencies. | Tech will need to go out with an variable audio tone generator to see where the source is of this mechanical vibration. Once found the tech must apply a special tape to the mating surfaces of the cabinet parts that are vibrating as stated in bulletin 244R1. This bulletin does not actually apply to this model but the approach to the repair is the same. Part # of the tape necessary for this job is 7-632-661-51 | Muller |
| Sony | KV27V66 BA4 | A.C. hum | Unit has a slight 60 Hz buzz in the speakers. When in the external input mode and no signal applied the hum is evident. | I asked tech to check to see if the upgrade listed in CSV #397. Jumper are present in the correct spots of the ""K"" board. Tech can measure 9.6 volts buzz at speaker terminals. However with the speakers disconnected the customer still claims to hear the 60 hz buzz. It this is true the tech needs to look into the deflection yoke for a cure the buzzing. By putting pressure on the yoke, the tech can try to eliminate the vibration in the yoke assembly caused by loose "" | Muller |
| Sony | KV13V50 BA3 | NO RASTER | Sony KV13V50. No raster. Has sound. Tech replaced CRT and Jungle chip without any positive results. | I had tech measure the Cathode of the CRT. All cathodes were at 368 volts. This voltage is about 180 volts too high. This voltage did not vary even when the CRT was disconnected. This indicated the 180 volts source at cathode of D512 180 v source was too high. If CRT were disconnected the voltage is still too high. Open bleeder | Muller |
| Sony | KP61XBR38 AP | RASTER | KP61XBR38. Unit has no raster but has PIP, Sound, and On Screen Display. This symptom shows up in the tuner and video input modes. | When checking the monitor output from the rear of the set the video is fine. Next we needed to measure the video in to the P4 board. This is the digital combfilter. Checking P432(6) we had good composite video. But there was no Luminance out at P4-32(3). All B+'s were normal on the post regulators on the board. Placing a 4.7 mfd capacitor between these points, luminance was restored. This test proved the combfilter was defective and the rest of the set was OK. It appears that IC201 on board may be defective. Video can be traced to IC201(25). Clock & BGP are present at IC201(11 & 17). Tech will need to replace the board if it is available. | Muller |
| Sony | KP53EX20 AP | WRONG COLOR | KPR53EX20 serial .8001436 unit has poor black and white tracking. Tech needs to know how to get into the internal adjustments to adjust drive to each CRT | There are no drive controls to any of the CRT. The only adjustment that can be made is G2 and focus. All other adjustments are automatic through he IK circuit. Suggest the tech look at each tube faceplate and inspect the phosphor for the normal registration burn. If the tubes are coffee color in the registration area It may just mean we have a set with a lot of hours on the CRT and they simply cannot produce enough light to achieve normal white balance tracking. According the tech the tubes were very dark in the | Muller |
| Sony | KP53XBR15 AP | system control | When the set is in the external video input mode and put back into the antenna mode the set will be on channel 167 with white noise on the screen. | This is an illegal channel entry and is not a function of CATV our the UHF channel number. Everything else works normally with the exception of this glitch. My suggestion is to try to initialize the EPROM and see if the symptom clears up. This action did not correct the symptom. EEPROM replacement solved the problem. | Muller |
| Sony | KPR46EX35 AP | SYSTEM CONTROL | KPR46EX35. Unit turns itself on or off at its own will. Customer explains that the TV will turn it self on in the middle of the night or it will turn itself off while watching the set. The power switch, IC001 in ""A"" board. "" | When measuring the Power Key input to the main Microprocessor, IC001(11) it was only 3.7 volts with no keys pressed. Even when connector A-8 was disconnected IC001(11) stayed at 3.7 volts. Also this voltage fluctuated in level from 3.5 to 3.7. When C038 was removed the voltage increased to 5.1 volts. Suggest the tech replace C038 a 0.01 mfd capacitor. With the new capacitor the voltage retained the 5.1 volts. C038 was leaky. | Muller |
| Sony | KP46S55 AP | squeal | KP46S55. Unit making a mechanical squeal either in the power supply or deflection circuit. The symptom occurs when the unit is first turned on. | Suggest tech listen to where the noise is coming from. It was determined that L501 was the source of the trouble. Rather than ordering the coil, I suggested the coil be saturated in a cyanoacryltic compound (super glue) to quite the loose coil laminations | Muller |
| Sony | KP46V15 AP | Squeal | KP46V15 serial 9009331 Unit has a high pitch squeal from the high voltage power supply Tech tried to glue the transformer with speaker cement now the set does not run anymore. | It is unknown what compound is in the glues used to quiet down the transformer but I would not use it any more. Super glue or cyanoacyralate is probably the best compound to stop acoustical lamination vibration. The tech will need to replace the flyback transformer. | Muller |
| Sony | KP53EXR95 AP | SHUTSDOWN | Sony KPREXR95 Unit will click on but not say on. | Unit going into deflection shut down. Unit has no horizontal sweep. Bad solder connection under Horizontal output transistor on ""N"" board "" | Muller |
| Sony | KP53S55 AP | shuts down | KP53S55 serial # 9101980. Unit shut down immediately after the set is turned on. Set does get high voltage. Tech replaced the flyback transformer which did not correct the symptom. | I asked the tech to check the B+ at the ""G"" board connector G2(9 & 1) Pin 9 should be 115 vdc and 1 should be -135. They were. Next connect and oscilloscope to the collector of Q811 (high voltage output) and turn on the set. There should be a pulse of 1000 volts peak to peak spaced at 63 microseconds apart. This signal was perfect then the set shut down. Next I had the tech check the Collector of Q502 (Horizontal output). There was no Horizontal signal, it should look exactly like the Horizontal output. Since Q502 runs on a negative source voltage the DC supply goes to Q502(E) it should be -109 vdc. It was ""0"" volts. Further checking it was discovered that Q508 was completely turned off. Checking the components in the Horizontal output circuit found an open R515 an 18K resistor. Replacing resistor restored "" | Muller |
| Sony | KP46V15 AP | SHUT DOWN | KP46V15 Unit has a shutdown symptom. | Several technicians were out and the last technician installs the D board regulators. IC904 is a 3 legged regulator used for the - 15 volts supply. The original was a plastic one. Tech did not realize the regulator was shorting the -15 volt to ground because the new device has a metal back where the original was all plastic. The cure was to cut the trace on the CBA that connected IC904 heatsink to cold ground. The enabled the set to operate with this new regulator. | Muller |
| Sony | KP46S55 AP | PINCUSHION | KP46S55 ser 9100302. Unit has a Q502 and Q508. Shorted. Pervious Tech was working on the flyback section. | On the ""A"" board the area around C510 has hole burned through the board. This makes the board unrepairable. Unit will need the A board "" | Muller |
| Sony | KP53V15 AP | Pincushion | KP53V15 Unit has Q509 getting very hot after 15 to 20 minutes | Previous tech did not put ant heatsink compound on the Device. Putting Heatsink compound on Q508 allowed the device to run 20 minutes but still gets slightly warmer than it should. R518 a 18K resistor has increased in value. | Muller |