Dicas Reparação




Modelo - Chassis


Pesquisa: Enviar Dica Resolvida
Resultados 77224
Pedir dica reparação
MarcaModelo
(Chassis)
SintomaCausaSoluçãoPor:
SonyKV2643R
CHANNEL DRIFT, REPLACED IC2003 Set would drift off channel during operation. Found IC2003(display memory) apparently loading control IC and changing PWM voltage.
SonyKV2643R
RETRACE LINES, BROKEN LAND ON C BOARD Servicer informed me of a problem where the picture would benormal and then get brighter and go into retrace and then back to normal.Then it again would repeat itself.
SonyKV2643R
DEAD, REMOVE JW54 AND OTHERS No operation above 100VAC. H. voltage was at 23KV. Servicerhad replaced flyback and IC501. Voltage to shutdown circuit was 5.7V.Removed L801, H. voltage went up to 26KV. -HQ COMMENTS: We will publish updated info on this problem shortly. Asfor now c
SonyKV1714
NO VIDEO No video. Just snow only. But if you adjust the tuningselector you can get ch. 7 and ch. 5 but if you go back to ch. 5 thesignal in ch. 7 will be erased. No -24V source.
SonyKV1543R
NO STATION SELECTION, REPLACED IC032 Stations wouldn't select and sound would turn up but wouldn'tgo down.
SonyKP5000
CHANGES CHANNEL BY ITS SELF, REPLACED INFRARED SENSOR Unit would change channels without manual or remote activa-tion. Customer indicated that remote functions would not coincide withremote hand unit when warm (this problem was intermittent).
SonyKV2643R
RETRACE LINES, REPLACED CX556 Set would gradually change from normal to retrace lines.Video signal on output of CX556 changing level.
SonyKV2601
NO SOUND, REPLACED IC033 This customer has a lot of static from carpets in the home.A spark jumps from her finger each time she touched the channel selectionbuttons. This time it took out IC033. The last time IC2001 failedcausing no sound. On the IC033 Pin 10, ch. bias voltag
SonyKV2601
PICTURE DRIFT, REPLACED C516 Dealer expressed concern over the fact that although thevertical was normal and the vertical hold was OK, the position where thepicture locked in was not in the mechanical center of the control infact it was to one end of the control.
SonyKV1712
DARK PICTURE Raster very dark. Chroma information present but no Y signalat output of Y amplifier. I found DC level at Pin 14 of IC401 was veryhigh and no video here as viewed on scope. Disconnecting Pin 14 from PCboard restored the video signal at Pin 14, IC401.
SonyKV1543R
NEON DOES NOT FUNCTION, SEE BELOW No function of neon bulb (NL15) on remote or manual commands.All other functions work. Found only 75VAC at junction of R018 and R017to ground.
SonyKP5000
WILL NOT STOP CHANNEL SEARCH, REPLACED C159 In the program mode, set would not stop searching when astation was tuned in. M-15 on the M board had the required horizontalpulse. M-9 on the M board had the sync pulse. The positive and negativeAFT voltages on Pins 1 and 2 of M-8 appear to be normal
SonyKV2643R
WEAK PICTURE, REPLACED LEAKY C208 Set had weak video with sync problem.
SonyKV2643R
NO TUNING, REPLACED IC033, CX804 After pressing channel button J none of remaining channelscan be manually selected until remote selection is used, at least once.
SonyKV2643R
PICTURE BLANKING, REPAIRED CRACKED FOIL This unit would rhythmically go from good picture to excessbrightness with retrace lines then to black screen. This would happen atabout a 7 second interval. This would happen continually as long as setwas turned on. The collector voltage on Q704, 705


Assistência TécnicaAs dicas apresentadas destinam-se a técnicos de eletrónica, a tentativa de reparação ou assistência sem ter conhecimentos de eletricidade e eletrónica, podem provocar danos mais graves aos equipamentos e, devido a tensões muito elevadas em alguns circuitos, graves danos fisicos que podem constituir um risco em determinadas reparações.

Não arrisque reparar equipamentos com tensões elevadas se não tiver conhecimentos técnicos para o fazer em segurança.

Verifique se o esquema está disponível na área de downloads