Dicas Reparação
Modelo - Chassis KV36FV1
Pesquisa: KV36FV1 Enviar Dica Resolvida
Resultados 11
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| 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 | KV36FV1 AA2H | GEOMETRY | KV36FV1 serial . Unit has shoulder roll off on the screen. | Gave tech bulletin #387 for the yoke upgrade | Muller |
| Sony | KV36FV1 AA-2 | VERTICAL SWEEP | KV36FV1 Unit has insufficient vertical sweep and vertical foldover at the bottom of the screen. | Suggest the tech try to replace the Charge pump diode and pump up capacitor D561 & C565. This did not correct the symptom. But it was found while moving the wires around the yoke connector the symptom changed slightly. But when tugging on the wiring going into the deflection yoke the tech found a significant change in the vertical deflection scan. There isn't a schematic for the yoke assembly but a small connector inside the yoke housing where the 3 controls were mounted. The connector is called P16.It was not soldered very well. It had thin solder across the land to the pin but what looks like pin oxidation it from making a good electrical connection. Resoldering the connection returned the set to | Muller |
| Sony | KV36FV1 AA-2 | HORIZONTAL SWEEP | KV36FV1 serial 9023663 Unit has a sever over scan condition for horizontal sweep. Tech did not measure any voltages in the pin amp circuit | Tech needs to check on L511, Q512, C513, C511, D502 & D504. One or more of these are shorted. | Muller |
| Sony | KV36FV1 AA-2 | horizontal | Unit has a severe over scan condition for horizontal sweep. Tech did not measure any voltages in the pin amp circuit. | Tech needs to check on L511, Q512, C513, C511, D502 & D504. One or more of these are shorted. | Muller |
| Sony | KV36FV1 AA-2 | GEOMETRY | KV36FV1 serial 9032273 Tech needs yoke modification for the yoke upgrade. | Gave tech bulletin 387R2 relating to the shoulder roll off | Muller |
| Sony | KV36FV1 AA-2 | focus | KV36FV1 serial 9046442 Unit has poor focus on left and right side of picture | The set has a dynamic focus error. Tech needs to see if the Dynamic focus circuitry is running correctly. Also before any hardware is tested the parameters of HAMP and DCSF should be adjusted to see if the dynamic focus is effected. When adjusting these parameters the values get the best focus when each is mixed out to 60. The focus becomes poor 2 inches from the left side of the screen and 5 inches from the right side of the screen. | Muller |
| Sony | KV36FV1 AA-2 | FOCUS | KV36FV1 Customer is running the television on a DSS satellite system. Customer claims the set looses focus in the picture when there is a lot of detailed movement. | This is caused by the 10 megabit throughput limit of the DSS video compression format MPEG3. In order for the compression to work correctly the Digitization process only updates the data that is changing. Background data is not updated as regularly as the foreground data. Hence when everything must get updated. But the MAX Data throughput is finite. the entire video waveform will not be accurately represented, instead the smaller detailed portions of the picture will begin to have larger pixels so not to exceed the Max Data. This is why to the eye the set appears to loose resolution or picture detail. This is normal. | Muller |
| Sony | KV36FV1 AA-2 | Dead | Unit is dead. After talking to customer they explained that they had a power surge caused by a car hitting a power pole. | The set was completely dead. VDR602 was noticeably burned up. Cutting this device our of the circuit found that it was open. However the device is connected in the circuit like a metal oxide varistor. It should measure open since it is in parallel with the A.C. Line. It was discovered that no other shorted components could be found in the primer of the power supply. Main line fuse WAS NOT BLOWN! Checking the raw AC voltage on the AC Line filters T601, and T602 find that we have no AC voltage on the output of T602 but present on the input side. Isolating the open coil and removing the defective VDR602 allows the set to turn on and operate correctly. Tech will need to replace T602 and | Muller |
| Sony | KV36FV1 AA-2 | DEAD | KV36FV1 serial 9029271. Unit is dead. After talking to customer they explained that they had a power surge caused by a car hitting a power pole. | The set was completely dead. VDR602 was noticeably burned up. Cutting this device our of the circuit found that it was open. However the device is connected in the circuit like a metal oxide varistor. It should measure open since it is in parallel with the A.C. Line. It was discovered that no other shorted components could be found in the primer of the power supply. Main line fuse WAS NOT BLOWN! Checking the raw AC voltage on the AC Line filters T601, and T602 find that we have no AC voltage on the output of T602 but present on the input side. Isolating the open coil and removing the defective VDR602 allows the set to turn on and operate correctly. Tech will need to replace T602 and | Muller |
| Sony | KV36FV15 AA-1 | RASTER | KV36FV15 Unit will turn on with the front panel control but the set will not develop raster or sound. The high voltage will turn but no raster. After 3 minutes the raster and sound will appear | Tech needs to look into the Data & Clock lines of the chassis. These lines must be 5 volts peak to peak and have a typical word length of 1000 milli seconds. Tech discovered the SDA pulses were 3.3 volts peak to peak whereas the CLK pulses were at 5 volts. Tech had to isolate each load on the SDA line and found the PIP tuner was responsible for loading down the DATA line. | Muller |