Dicas Reparação
Modelo - Chassis KV25DXR
Pesquisa: KV25DXR Enviar Dica Resolvida
Resultados 21
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KV25DXR | NO VERTICAL DEFLECTION | No vertical deflection. Caused by Q-2030 failing to pullreset line to its normal high. Note: Schematic error page 55 (J-7).D-2056 should be connected at the junction of R-2198 and R-2199. It willnot operate as drawn. | ||
| Sony | KV25DXR | HIGH VOLTAGE SHUTDOWN | Set would go into high voltage shutdown at turn on. Bydisabling hold-down circuit (open up R-571) I had about 11 Vdc onprotect line, 225 Vdc on 200 volt line and 39 KV high voltage. Thepicture was about 3 inches small from both sides and top to bottom. | ||
| Sony | KV25DXR | VIDEO HAS NOISE ON HIGHLIGHTS | Unit displayed noise on high frequency portions of video.Noise was mostly red in color. Video input to this IC looked clean -RGB outputs displayed noise in waveform. | ||
| Sony | KV25DXR | DAMAGED c-570 ON (D) BOARD (JAIL BAR - ON LEFT SIDE SCREEN | Jail bar appears on the left side of screen. | ||
| Sony | KV25DXR | NO COLOR ON SCRAMBLED STATIONS ON CABLE | Problem on the Exeter Cable Co. Exeter, New Hampshire(continental). The unit had no color on 1 scrambled station and flashingcolor on the other. Found burst signal - measured 80mv on the stationthat was flashing and 50mv on the one with no color. All | ||
| Sony | KV25DXR | UNIT WAS LOCKED IN SERVICE READY MODE | Locked in service ready mode. | ||
| Sony | KV25DXR | ALL DISPLAYS APPEAR IN BLACK/HMH AND RGB BLANKOUT | All on screen displays ere black. HMH and RGB would blank outthe screen when they were selected. Found no output from IC306 - RGBoutput pins. Found no H.V. Blk. pulse on pins 8 and 9 going into IC306.Traced this back to (BD Board) output CKEY+UDHBLK. | ||
| Sony | KV25DXR | LOCKED IN SERVICE READY MODE | These 2 sets were locked in SERVICE READY mode. Both reportedproblem happened after thunder storms. No screen on displays would work,but all functions would work. HMH as well as all adj in SERVICE mode. | ||
| Sony | KV25DXR | POWER SUPPLY | Unit came in with blown power supply. All parts founddefective were replaced. Unit was turned on and exhibited foldover at topand jittery pix. IC651, Q651, Q652 failed again. Problem was found to beon GB board. | ||
| Sony | KV25DXR | DARK LINES H&V IN PICTURE AT POWER ON AND HMH | At power on there were dark horiz. and vert. lines in thepicture with the video in the background. After about 20 sec they woulddisappear and the picture would be normal. Going into HMH the lines wouldalso be there and they would stay until go was pres | ||
| Sony | KV25DXR | INTERMITTENT LOSS OF SOUND AND VIDEO | Intermittent loss of sound and video. The bracket that theB board is mounted on has a small section which contacts the transistor,Q2030. The emitter and base lead are shorted together causing thisproblem. | ||
| Sony | KV25DXR | LOCKED IN WITH SERVICE READY READ OUT | Set was locked in with SERVICE READY read out on screen.Operation of service switch made no difference. Voltage and waveformanalysis did not help to isolate the problem to a particular component.I suspected the memory chip might be the cause so I replac | ||
| Sony | KV25DXR | DARK PICTURE - NO COLOR SYNC | Set had very dark picture and no color sync. | ||
| Sony | KV25DXR | BAR IN MIDDLE OF PICTURE, REPLACED IC502 AFC CONTROL | Ghost image overlays normal video on screen. Horizontalblanking bar appears in middle of pix. | ||
| Sony | KV25DXR | HMH NOT LOCKED | Home management helper program was out of sync. Looked likea lot of dashed lines. |