Dicas Reparação SONY
Modelo - Chassis
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KV2649R | POOR PICTURE, ADJ VHF AGC | Poor picture on cable busy background. | ||
| Sony | KV2648R | NO PICTURE, REPLACED Q502 | No picture, high pitch squeal. | ||
| Sony | KV2648R | NO PICTURE, REPLACED FBT AND Q502 | No high voltage. Flyback shorted causing horiz. output tofail. | ||
| Sony | KV2648R | HORIZONTAL BARS ON THE SCREEN, REPLACED PRESCALER AND TUNER | Horizontal bars on all channels. | ||
| Sony | KV2648R | SQUEAL FROM POWER BOARD, REPLACED T602 | Squeal from power board. Pressing on F board changes pitchof squeal. When pushing on board directly beneath POT squeal stops. | ||
| Sony | KV2648R | NO VOLUME CONTROL, LEAKY Q4025 | The bar pattern would not extend across the screen. | ||
| Sony | KV2647R | PICTURE FADE AFTER TIME, RESOLDER ON "C" BOARD | Video would begin to fade after 2 hours. Wire to C board-12VDC to outputs had intermittent cold solder connection at trace next toC702, appeared to be thermal problem. | ||
| Sony | KV2647R | CONVERGENCE CHANGE IN HOT CONDITION, REPLACE YOKE | After the set would warm up convergence would change. Lowerright corner would start to misconverge and get worse the longer set wason. | ||
| Sony | KV2145R | DEAD, FUSE & DAMPER DIODE | Unit came in with blown DC fuse and a shorted damper diodemounted on the conductor side of board, cathode connected to cathode ofD501 and anode to ground. This is a production mod. and no informationexists as to its type or part number. As it resembles | ||
| Sony | KV1922 | JAIL BARS ON LEFT SIDE | Jail bars on left side. Servicer had replaced flyback andyoke - no help. | ||
| Sony | KV1743R | REPAIR BOARD COMPATIBILITY | Chassis #SCC204A-A found change in M-2 board not reflected onprint. R025 exists in series with IC031. Which print applies? Are thereany other changes? -HQ COMMENTS: R025 resistor's function is to fine tune RC constant forVC formation from PWM pulses. | ||
| Sony | KV1541R | TUNING DRIFT, REPLACED D2007 | After about 8 hours this set would start drifting on low band.Servicer claimed that only ch. 2 and 3 would drift, rest of low band OK.Upon further inspection I determined that what was actually occuring wasthat low band channels were switching into high | ||
| Sony | KV1222R | DEAD | All six above sets were dead out of the carton. Inspectionrevealed no B+ to receiver. I then noted the leads to R901 were bothbroken right at the terminals of the resistor. Throwing out thepossibility of sabotage, it appears that the problem was cause | ||
| Sony | KV1207 | NO PICTURE, SEE SB0200R | Found D064 leaky, this was replaced and 15 days later unitcame back and this time D063 was found to be leaky. Ten days later unitcame back with D063 leaky again. Each time the diode is replaced. | ||
| Sony | KV1206 | LOOSES MEMORY, REPLACED D514 | This receiver had no memory. Stations could be programmed,but would be lost as soon as channel was changed. Inspection revealed thatIC034/Pin 7 was positive, -24V was missing. Scope showed horiz. pulse on-24V line. Further checking quickly revealed D51 |