Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 79950
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DEAD, REPLACED C019 Set would not turn on. Found C019 shorted.
NO SOUND, BROKEN LEAD ON OUTPUT TRANSFORMER No sound. Inspection revealed broken wire from secondaryof sound output transformer to solder lug, right at the lug.
NO VHF, BT981 PRESCALER No VHF low and high band, very intermittent.
INCORRECT TUNING FUNCTION, REPLACED IC004 Only numbers 1 or 2 can be addressed on TV by hand unit.Operation on channel selection manually is OK. I found Pin 28 of IC004has 10VDC on it at all times. Waveforms on Pin 37 were normal but theamplitude of waveforms at Pin 14 were very low with all n
NO PICTURE Unit would blank out approx. after 1/2 hour, sound stillnormal. By turning set off for a while and turning it back on, the unitwould again work for a shorter period of time and blank out. Found thatby freezing vertical output IC unit would function nor
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.

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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