Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 80995
Pedir dica reparação
SET WOULD NOT TURN OFF, REPLACED RL001 Set would not turn off when power switch pressed. Brightnesslevel would drop but would not turn completely off - intermittent problem.
SHORT RANGE REMOTE OPERATION, REPLACED D1 Customer complained of short range, approx. 12 feet.
NO TUNING MEMORY, REPLACED C047 Customer pulled AC plug from wall outlet during electricalstorms, had to reprogram tuner (lost its memory). C047 a 100pF capacitoron the WRITE/ERASE line (Pin 6 of IC034, CX761) defective allowing pinto remain high after AC disconnection.
SNOW PICTURE, REPLACED C038 Every 2 weeks picture would go to snow and remain in onechannel position. Tuning functions totally inoperative and manual channelselection would not work. Volume up and down functions OK. Clock osc.waveform wrong also voltage at Q034 base 0V should be
AUDIO HISS NOISE, REPLACED IC401 Left channel of matrixed side had distortion plus somebackground hiss, right side sounded good. Disrotion showed up mainlyon music, and background noise only showed up when no voice or musiccame from TV.
DEAD, REPLACED FBT AND OTHERS Set had a bad flyback causing multiple problems such asshorted horizontal output transistor and B+ regulator.
PICTURE NOISE This unit exhibited several faint vertical bars on the leftside and middle of raster.
PICTURE NOISE Retrace lines in the screen. Found R721 and R722 reversedin circuit.
NO MANUAL OR REMOTE FUNCTIONS, REPLACED X002 No manual or remote functions. No 12 volt on Pin 12, IC004.Clock frequency was correct but only 0.5Vpp. Voltage on Pins 1 and 42 ofIC004 was the same on both pins, 0.6V.
CHANNEL INDICATORS NOT LIT, LEAKAGE BETWEEN IC032/PIN 1 & 20 Unit would not come on with all channel indicators lit.Unable to select channels. Once in a while unit would function properly.
NO OPERATION, REPLACED L001 Although remote and manual controls did not work, unit wouldcome on with master on/off switch (intermittently).
DIM PICTURE, REPLACED R555 AND D513 Dim picture. Found no 950V on C board, R555 open and carbonpath between Pins 1 and 2 in CRT socket.
SHUT DOWN, REPLACED RELAY RL001 Set plays several hours, then shuts off. Remote control ormanual on-off buttons would not turn the set back on for several seconds.Relay would click every time the set on/off button was pushed.
PICTURE DISTORTION Vertical flutter at top one-half inch of picture, increasingvertical size control would eliminate this and fill out picture, butretrace lines would appear. Vertical output waveform at Pin 3 of IC502was of sufficient amplitude, but had horizontal signal
CHANNELS NO LOCK No reception for 30 minutes when set is started from a coldstart. Then channel change was very slow. Channel did not changeinstantly but slowly over a period of 5 to 10 seconds.

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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