Dicas Reparação SONY
Modelo - Chassis
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| 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 | KV32S45 AA-2 | GEOMETRY | KV32S45 serial 8102913 picture is rotated clockwise by 1/4 inch. Tech claims this tube does not have a pix tilt circuit or rotation on the CRT bell | Tech needs to break the bonding of the yoke ant reposition the yoke. | Muller |
| Sony | KV27V65 AA-2 | GEOMETRY | KV27V65 serial 8027393 Customer complaint is a slight geometry error or tilt in the lower right hand corner of the screen. It causes a symptom of horizontal lines that are not perfectly straight. In this case the lines are elevated by at width of 2 horizontal lines. | This television is operating within specifications. The geometry errors should not deviate more than 1/8 of an inch across the length of the Horizontal line. Horizontal tilt can be no more than 1/8 of an inch. This television beats this measurements. There is nothing I can recommend to the tech to do to improve on the geometry of this receiver. | Muller |
| Sony | KV27S10 AA-2 | GEOMETRY | KV27S10 serial 723009 Unit has symptom every time the set looses power the geometry memory is lost VPOS, VSIZ, HSIZ. PAMP drop at least 10 points each. When resetting these values and writing them to memory the they will be erased as soon as power is removed | Tech needs to replace the EPROM??. I002 corrected the problem | 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 | KV27V65 AA-2 | Dead | Unit is Dead Tech replaced the IC601 and R607 and the Flyback, but when power was reapplied the set destroyed the power supply again. | Unit had a blown IC601 and R607. Tech had failed to check the condition of the Power supply output for the 135 vdc source.. It was discovered there was a 1.2 ohm short to ground caused by a shorted protect diode in the secondary of the power supply. I cannot stress enough the tech needs to check all loads on the secondary of the power supply for shorts, and use a variac to start up all power supplies. All parts changed earlier are destroyed and need to be replaced | Muller |
| Sony | KV32XBR48 AA-2 | Dead | Originally dead with shorted IC601 converter IC and horizontal output transistor shorted too. | Checking the Collector of the Horizontal output transistor the retrace period was running in excess of 20 microseconds not the traditional 11.5 microseconds. Closer inspection found the deflection yoke leads inside the connector were loose and the crimp for the wire to the horizontal winding were not making contact to the terminal inside the connector. | 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 | KV35S26 AA-2 | dead | KV35S36 serial 9027801 Unit goes dead after 10 minutes after the power supply was repaired.Q601 & Q602 were not running hot they just shorted. They were replace 4 times. Each time the transistors lasted 10 minutes and in 1 case 1 week. | After running the television for over 1 hour with the CRT disconnected It was determined the power supply, deflection, and horizontal deflection were all working. It was further decided to change the CRT needs to be replaced. CRT fixed the unit. | Muller |
| Sony | KV32XBR48 AA-2 | dead | KV32XBR48. Originally dead with shorted IC601 converter IC and horizontal output transistor shorted too. The horizontal drive looked odd, but this was not the problem. | Checking the Collector of the Horizontal output transistor the retrace period was running in excess of 20 microseconds not the traditional 11.5 microseconds. Closed inspection was found the deflection yoke leads inside the connector were loose and the crimp for the wire to the horizontal winding were not making contact to the terminal inside the connector. Cleaning the terminal and prepping the connection was necessary because there was evidence they were burned by the voltage drop in the poor connection . | Muller |
| Sony | KV32V40 AA-2 | dead | KV32V40 Unit was originally dead. Q502 was replaced. Now set has a sever over scan of horizontal sweep. Collector of Q512 only 2 volts Q512 was shorted. L511 is burned and needs to be changed, along with D504 D503, D502, C511, C513, and L511. | After replacement of the components the sweep was still excessive. When using an oscilloscope on the IC351(31) the E/W pin out we found 6 volts DC, and no 60 HZ parabolic wave form. If this E/W output pint was touched to ground through a 270 ohm resistor the picture narrowed up to a an almost normal width. Product had defective IC351. | Muller |
| Sony | KV32S40 AA-2 | dead | KV32S40 Unit will run for several days then it will short the horizontal output transistor and destroy the power supply IC601 | This product was brought into the shop where the set was operated with the CRT disconnected for approximately 100 hours continuously. It ran fine. But 6 hours after the CRT was connected the Horizontal output and power supply self destructed again. Unit has defective CRT Suggest the tech replace the CRT | Muller |
| Sony | KV32S40 AA-2 | dead | KV32S40 serial 8001469. Unit had the power supply IC601 shorted and open R607. Tech replaced these components and it shorted out again at the instant the television is plugged in. | I never recommend that after replacing these components in the power supply that the set have full line voltage applied to it. The odds are very high the new components will be instantly. Suggested the tech use a variac to do these tests. This power supply should start running at 10 vac as a line source. The current should never go above 100 ma during a no load test. Max 800 ma during a normal load. When running this power supply at 15 volts the current was surging to over 200 MA. Checking al the loads on the secondary found no obvious short circuits. However when checking the capacitors in the primary we found C610 has internal resistance of 470K, There should be no internal resistance. Replaced C610 and restored normal operation. Suggest that C609, C610, C611, and C612 be automatically replaced | Muller |