Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 78107
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RETRACE LINES, REPLACED R749 Excessive brightness/retrace lines. RV2203, RV304, RV701 haveno effect, Pin 12 CRT = 850V.
DARK PICTURE, RESOLDER R054 Raster goes dark with sound bars, sound normal, then normalpicture jumps back. Found R054 mounted on the print side, cold soldered.
H TEARING & FLASHING, RESOLDER ANODE LEAD R067 on MF board overheats. Noticed intermittent horizontaltearing and flashing across screen. Found anode lead which is a plug intype, was not making firm contact.
SHUT DOWN, L503 BROKEN OFF Set would go into shut-down mode immediately at turn on.I verified horizontal oscillator and B+ circuits were operating properly.I then noticed that the coil L503 was broken off of the connection onPC board.
TUNING SHIFTS Channels would program correctly. If set was on channel 2and moved to channel 8 then back to channel 2, channel 2 would not comein. Same with channel 8 when set was returned to this channel. Thiswould also happen if the set was turned off and back on.
SHUT DOWN WITH JIG, GROUND HVR This particular unit shut off instantaneously when power wasturned on. It happens only when chassis was attached to the jig. Most ofthe time technicians spent useless hours to find out that the ground onthe HVR was missing (usually a screw grounds the
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.

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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