Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 78116
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PIN CUSHION, ADD RESISTOR IN SERIES WITH R809 Pincushion correction at top and bottom near the corners isalmost null. -HQ COMMENTS: To correct the problem place a 15 ohm 1W resistor inseries with R809 (100 ohm 1W) and readjust pin phase and pin ampcontrols.
NO CHANNEL LOCK, REPLACED C206 Except on low band this unit keeps on scanning stations.Ch. 2, 4, 5 could be tuned in but slightly have weak video (slight snow).Found C206 leaky causing a drop, at Pins 26 and 28 to 1.7 volts insteadof 4.6 volts.
VERT ROLL, INTERMITTENT VERT COLLAPSE, REPLACED C508 Set operates fine for 1/2 to one hour then starts to roll,then vertical collapse. Found C508 improperly installed (reversepolarity).
PICTURE DISTORTION, SEE MODIFICATION BELOW Horiz. centering adjustment will not shift picture far enoughtowards the right. Center adjustment only expands the picture. -HQ COMMENTS: Try the following circuit modification. Place the horiz.centering R. position. The R1, R2, C1 values shown shoul
NO CHANNEL LOOK Set changes channel by itself usually ending on Ch. 13position.
INCORRECT MECHANICAL FUNCTION, USE OF LOCTITE When unit was turned on the mirror door would extend about2/3 of the way out and start clicking. The motor would continue to runand not shut off. Disassembly revealed the retaining nut on the driveshaft had worked loose allowing the left hand side door
NO PICTURE, OPEN R057 AND PRESCALER, R057 resistor open (MF board). No problem found in reg.circuit. Solder splash on feed thru terminal of prescaler.
TUNING WOULD NOT LOCK, REPLACED S2262 TV would continuously scan through all channels. Foundchannel up button closed.
DARK PICTURE, REPLACED R-751 Dark picture like weak CRT. Found R751 changed value.
PART NUMBER MISSING Servicer has KV-2601 with spark gap on C board shorted -schematic designation SG. The part number was omitted from the servicemanual of all the above listed models. -HQ COMMENTS: The spark gap in question is not available as a separatepart. It comes w
PICTURE DISTORTION, REPLACED C544 Severe pincushion problem, pin control has no control. Baseof Q503 was negative instead of 2V. Found signal on base has a lot ofspikes, which could come only from one point, the flyback. C544 was opencausing no filtering.
NO PICTURE, REPLACED SHORTED Q006 AND Q008 ON MD BOARD This set had no VC voltage and band selection voltages werewrong at tuner.
SHUT DOWN, TRIMMED R563 This unit intermittently shuts off by itself.
PICTURE DISTORTION These two units came in with high brightness with retracelines. Found R721 open.
INTERMITTENT REMOTE OPERATION, REPLACED C005 Remote commander operative only about 10% of time, mostfunctions completely inoperative. With scope probe at TP 52 M-2 boardabout 5Vpp random noise present and remote control signal distortedwhen actuated.

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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