Dicas Reparação
Modelo - Chassis KV2648R
Pesquisa: KV2648R Enviar Dica Resolvida
Resultados 40
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KV2648R | UNIT IS INOPERATIVE, OPEN R-607 | Q-604 turned on disabling the oscillator on the power supplysection. The base of Q-605 is 2 volts thereby allowing Q-604 to conduct.I found out that R-607 is open. | ||
| Sony | KV2648R | HORIZONTAL PULLING, REPLACED R606 AND R607 | Horizontal pulling, accompanied by ticking noise present whenoperating unit above 110 volts A.C. | ||
| Sony | KV2648R | NO PICTURE NOR SOUND, RESOLDER INSIDE PRESCALER(BTP981) | No picture nor sound, snow, VC control not working (0 volts). | ||
| Sony | KV2648R | HEAVY ARCING, RESOLDERED BROKEN ETCH | When set was turned on, heavy arcing would occur around theflyback. Servicer had replaced the flyback, which did not help. Foundground etch near T503 was open. This caused the flyback return to beopen. We discovered this by connecting the osc. ground | ||
| Sony | KV2648R | AUDIO NOISE IN MATRIX, RESISTOR CHANGE | Whistle in matrix audio only. The countermeasure given to meto resolve this problem worked. | ||
| Sony | KV2648R | INTERMITTENT PICTURE SHRINK, REPLACED IC601 | Picture shrinks intermittently. Stations shift when pictureshrinks. | ||
| Sony | KV2648R | DEAD SET, REPLACE R570 AND H OUT | After about 15 min. horizontal output transistor (2SD957A)would short out. During the first 15 min. transistor would increase intemperature. Found R570 was reading less than 0.2 ohm - should be 0.22ohm - was able to put in a 0.23 ohm and everything rem | ||
| Sony | KV2648R | NO BAR DISPLAY, REPLACE SHORTED Q4028 | No bar display in any function except if volume was atmid-range. Picture control would increase or decrease length of bardisplay. With color, hue or brightness there was no bar display.Pressing hue, bar was all green. Checking input to counter reset, | ||
| Sony | KV2648R | BUZZ IN AUDIO, ADJ AFT AND SOUND IF | Buzz on some channels in audio. | ||
| Sony | KV2648R | BEAT PATTERN IN THE PICTURE, REPLACE VHF TUNER | Beat pattern on all channels. Disconnected VC and applied DCvoltage. Found it only took 0.01 volts to go from a fair picture to onewith beat pattern. | ||
| Sony | KV2648R | NO SCREEN DISPLAY, OPEN Q4049 AND SHORTED D4046 | Bar pattern would not operate on any function. Found 9VDCmissing on output of 9VDC regulator. Found transistor, Q4049 opened andD4046 shorted. | ||
| Sony | KV2648R | SHUT DOWN, REPLACE IC601 | This unit shuts down about every four hours. We found the135V line going high. DM7/IC601 was found to be thermally intermittent. | ||
| Sony | KV2648R | HUM SOUND, ADJ T204 AND T205 | Constant 60Hz hum heard on audio when HBO or SHOWTIME isselected. Tone enhance feature on TV boosts hum level even louder. TheJerrold JSX3DIC cable box does not remove the 60Hz AM sync pulse off thesound carrier to the TV. If the alignment is not perf | ||
| Sony | KV2648R | NO SOUND, REPLACED R5038, R5039, IC5004, IC5005 | Set had no sound, found R5038 and R5039 open. Also foundIC5004 and IC5005 shorted on X board. | ||
| Sony | KV2648R | DEAD, REPLACE R616 AND Q603 | Set would operate for approx. one to two min. It would thenblow the converter out in power supply and the line fuse. Found R616open and Q603 leaky from collector to emitter. |