Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 79454
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DEAD, REPLACED HDT No raster - no high voltage. Servicer confused with hi-voltshut down. Virtually lost scope pattern at secondary of horizontaldrive transformer.
PART RELIABILITY SG-613 supplied was installed by service station. Partfailed immediately. Cones on part are not correct for use in Sonytelevision. Construction of part is different in appearance to partssupplied by Kansas City. Code on part: OK-H. -HQ COMMENTS: In
VOLUME RANGE TOO LIMITTED, CHANGE R102 TO 100K Sound is either too low or too high. Customer states thathe thinks the volume should move from low to high in a slower manner,rather than jump from low to high. -HQ COMMENTS: We can satisfy the customer by changing R102 resistorvalue from 10k to 100k.
NO SOUND Failure of sound section of IC201 due to static discharge inlow humidity environments. Have scrapped volume slider decorative buttonto remove excess silver plating. No help. -HQ COMMENTS: We are sending you a countermeasure proposal involvingapplicati
PICTURE DISTORTION Slight fold-over in center of screen. C406 apparently driedout over the years. Located off emitter of ABL Q4091.
NO POWER ON No power-on switching using front panel switch (S802) orremote. Customer claimed power would come on intermittently and thatother functions such as video switching, antenna switching would workerratically (this was not verified). When S802 is depressed
NO SYNC, REPLACED Q317 AND Q318 BOTH SHOULD BE 2SA1175 Unit had no vertical nor horizontal sync. According toservice manual, Q317 sync SEP-1 should be 2SC2785 and Q318 sync SEP-2,should be 2SA1175.
VERTICAL DISTORTION WITHOUT VIDEO Vertical collapse under no signal condition. Set appeared tohave proper vertical waveforms when receiving off the air broadcast, butwhen no station present only a thin line, this indicated oscillatorfailure or no self-sustaining ability.
NO OPERATION WITH AC Set would not work on AC. All DC checks which we could thinkwere performed. Power supply simply would not start. Found waveform 27would appear for just an instant and die away. Transformer T606 checkedgood so C611 must be culprit.
DOOR JAMMING Left side door was found to be inoperative when inspected bydealer. Found mounting bolts loose on motor assembly. Motor ass'ydrive gear could not engage in door drive track. Bold heads had pulledinto soft wood due to shipping and handling jolt.
NO PICTURE, REPLACED H OUT TRANSISTOR Receiver had no B+ voltages. All voltages and waveforms atprimary side of T602, F board, were all right. Resistance check of 135Vlines was 200 ohms to ground. Horizontal output transistor was shorted.
NO VERTICAL SYNC DURING CHANGING CH., WRONG VALUE R580 Vertical sync loss when changing channels, OK when scenefades out before a commercial.
LOW BRIGHTNESS, REPLACED R751 Low brightness, like weak CRT.
CHANNEL WOULD NOT LOCK, ADJ T205 AFT COIL Would not lock on to cable channel #14. Cable companyrunning mid-band channels 1.2MHz to 1.9MHz below accepted centerfrequency.
INCORRECT PICTURE POSITION, ADD CAP Unable to center picture horizontal. Picture off to the leftby 1/2 inch with TAP plug into RIGHT position. Servicer changed yoke,diodes D519, D518 and resistors around center area. I changed severalcapacitors. Customer has had this problem from the f

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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