Dicas Reparação SONY
Modelo - Chassis
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KV2648R | INCORRECT COLOR, RESOLDERED IC4005 PIN 14 | Bad color. Hue was bad. Could be mistaken for purityproblem. Found bad solder connection at Pin 14 of IC4005. | ||
| Sony | KV2647R | PART OF PICTURE BLANKING OUT, R557 VALUE CHANGED | Horizontal problem. Part of pix blanked out. Frequency notstable. Found R557/1.2 ohm resistor had climbed in value to 12 ohms.Resistor located on the 15V line. | ||
| Sony | KV2647R | INTERMITTENT NO CHANNEL RECEPTION, REPLACE R-025 | This unit would not tune stations intermittently. Found R025/22K ohm resistor increased in value to 35kohm on MF board. | ||
| Sony | KV2647R | NO CHANNEL 11 RECEPTION, REPLACE IC002 | This unit would not tune channel 11 in all the way. Thescreen displayed a HERRING BONE pattern. At first it appeared to be anAFT problem. However further investigation revealed IC002 memory to bedefective. | ||
| Sony | KV2645R | POPPING SOUND ON CHANNEL CHANGE, REPLACED T207 | Servicer had replaced T207, hoping to cure a highly inter-mittent sound loss problem. Set was returned to shop and I noticed apopping sound on channel change. | ||
| Sony | KV2601 | INTERMITTENT ALL CHANNEL DISPLAY | Intermittently unit would go to all channel display lightslit. Could not tune in any station when all lights locked in. Foundnegative line off flyback OK but after going through coil L511 found thatthe negative voltage sometimes missing. Also serial n | ||
| Sony | KV2602 | INTERMITTENT SHUT DOWN, REPLACED IC501, D501, Q501, T502 | Intermittently goes into HV shut down. Changed IC501, D501,Q501, T502. Also reduced the value of R572 to satisfy the adj. procedure. -HQ COMMENTS: Probably this type of shut down is caused by defective HVRblock. The 15.2 +/- 0.1V specified in adjustm | ||
| Sony | KV1946R | PICTURE DISTORTION (V), REPLACE IC502 | Would not scan top 2 inches of picture V-size and lin. hadno effect, remove blanking and fills up picture. | ||
| Sony | KV1923 | PICTURE DISTORTION (V) | Unit came in with 2 of vertical. We found C520 shorted andthis restored height but the linearity was poor. Found C529 to havechanged in value - evidently damaged. C520 must have tantalum replacementfor best results. | ||
| Sony | KV1922 | PICTURE DISTORTION (PIN) | Severe pincushioning and poor width. Q513 pin amp shorted andC810, IC546 to be dried up. After replacing these parts the pin and sizewere substantially improved. However during the first 5 minutes of opera-tion the left and right sides were pulled in | ||
| Sony | KV1910D | PICTURE DISTORTION (H) | Unit had severe horiz. foldover and would short the SG613 atfull voltage. The problem is very elusive to find. Have seen severallately. | ||
| Sony | KV1723D | DEAD | Servicer had replaced horiz. output SG613 and regulator2SC867A. Replaced again, also R556 in start ckt. Monitored voltage dropacross R807 - too much. Replaced C813 and C809. Set came on, however,now no G-Y from chroma demodulator. Checked waveforms | ||
| Sony | KV1722 | PICTURE BLANKING | This unit was in full blanking. The B+ regulator was workingfine. We found the 11V zener off the base of Q606 (EVP-1) to bedefective. The zener threshold was approx. 5V. | ||
| Sony | KV1515 | STATIC RELATED DAMAGE | This unit has now been repaired 3 times with static relateddamage to the tuner as the problem. A visit to the customer's homerevealed nothing out of the ordinary. We then carefully gift wrappedthe tuner cluster with 3M electric tape #1245 and grounded | ||
| Sony | KV1515 | DEFECTIVE VC DRIVE | We have found many units with defective VC drive transistors.The transistor generally fails within the first 30 days of operation.This is not a 2SC9450R 2SC1364 transistor. In fact I have not seen thisvariety in a Sony product. |