Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 79038
Pedir dica reparação
NO PICTURE, REPLACE C2213 33V line shows video on DC of about 1 1/2V. After warm-uptuner drifts off channel with or without AFC.
NO TUNING OPERATIONS, REPLACE IC003 Channel up or down inoperative. Also unable to erase anychannels. No logic change at Pins 1-4 on IC003.
NO FUNCTION, REPLACE X2001 Unable to control volume picture or channel change. LED wouldnot light. Found osc crystal low in amplitude at IC2001. Freezingcrystal would change amplitude from 20mV to 2V.
DARK PICTURE, R715 OPEN Picture was dark. Measured screen voltage. Range was from105-185 Vdc. Found R715 reading in the megohms.
PICTURE DISTORTION Set had pincushion problem. Traced problem to Q514. Signalat collector was distorted.
DARK PICTURE Picture was very dark. No brightness and no 900V to CRT.
TUNING DRIFT Stations could be locked in, but then would drift off. Pin 10of IC201, AFT amp out was floating, and voltage was varying.
DARK PICTURE Color information was present but there was no luminance atoutput of IC341. Input signal was OK.
PICTURE DISTORTION Short width - from 1/2 to 1 inch. Problem starts as PINproblem. Servicer then finds picture just a little short of width. Mayhave been like that for some time.
MECHANICAL MISOPERATION, GREASED SMALL GEAR SHAFT BEARINGS The door would open only halfway and the motor would shutoff. The door would not close more than 2 inches before shutting off.There was no grease on the small gear shaft bearing.
OVERSCAN GREEN CRT Green tube was overscanned. Traced problem to Q5337.Transistor was leaky from collector to emitter.
DEAD, REPAIRED CRACKS ON BOARD Set came in dead. No power, whether using batteries or ACadaptor.
WHITE VERTICAL BAR ON THE PICTURE, SEE CIRCUIT CHANGE BELOW White vertical bar about three inches in from the left sideof the screen. It would go away when the PC boards were opened out tothe service position.
INTERMITTENT POWER ON/OFF, REPLACED D021 Intermittent power on/off. Customer controls erratic.Found D021 leaky on MT board.
VOLUME LOW, REPLACED T205 At maximum volume setting, the volume was about 1/3 ofnormal. Inspection of sound output signal at Pin 14, IC201, revealed avery low level signal.

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.

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