Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 79454
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TV WOULD NOT COME ON TV would not always come on. Found C508 intermittently open.
COLOR CONFETTI ON B/W, ADJ CV301 Color confetti on B/W telecast.
NO PICTURE, REPLACED F601, Q602 AND Q603 This unit keeps on blowing F601 and Q602. Isolated problemon the F board by disconnecting the 135V B+ and supplying a separateexternal B+ (TP92 was the ground return) to the A board. This makes theA board work. HV normal but no raster. Then by using
NO MANUAL OPERATION, REPLACE C4038 You cannot turn set on or off by manual button. Set wouldwork OK with remote. I found no logic high at Pin 33, IC4001. CapacitorC4038 was shorted on MZ board.
BOTTOM OF SCREEN BLANK OUT, REPLACED CX841 Bottom and left side area of the screen blanked out. FoundCX841 defective.
BLACK LINE ON THE SCREEN, REPLACE V OUT IC502 After set would warm up a black line about 3/8 inch (veryfaint) would appear in the center of screen.
NO OPERATION, H OUT Q-502 No sound, no picture. Found horizontal output shorted.
VERTICAL BARS ON THE SCREEN, REPLACED C539 Vertical bars on left side of screen. Almost like ringing.Horizontal spike riding on B+.
VERTICAL JITTER, REPLACED C511 After 5 to 10 minutes on, vertical jitter is noticed andbecomes increasingly severe. Sometimes a brighter line is apparent acrosscenter of screen (slight folding). Found C511 2.2ufd at 20V tantalumcapacitor very slightly leaky (100k).
INTERMITTENT SOUND, REPLACED T207 Sound intermittently goes dead. Troubleshooting indicatesthat the sound is not passing through the IF section. Isolated problemto T207.
PICTURE NOISE Retrace line.
DEAD Dead set. Found defective the following parts F602, Q901,D514, D502. After replacing defective parts it was found R560 and R561were getting hot. Traced cause to an open contact between circuit boardand L502 the HLC coil.
NO UHF No UHF. Found B-E of Q103 shorted.
SOUND ONLY ON CHANNEL 5 Intermittent or garbled sound only on channel 5. Because theproblem was only on channel 5 the audio IC and outputs were ruled out.Monitoring Q107 it was found to be muting on and off when on channel 5.NL2204 was then replaced and the problem was cured.
CHANNEL NO CHANGE Cannot change channels, push buttons will not light whenselected. Found 35V missing at Pin 10 of IC033.

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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