Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 79038
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NO SIGNAL RECEPTION ON CHS 11 AND 13, REPLACE IC-002 Could not tune in chs 11 and 13. All other channels OK.
SHUT DOWN, POWER MODULE Power module causing high B+, shutting the set down. Uponreplacing power module, noticed non-linearity in the bottom half of thepicture. Top half of the picture was fine.
SHUT DOWN, REPLACED D502 ON A BOARD Unit would shut down when the voltage of D502 dropped below4.8V. In the schematic Pin 9 of IC501 shows 5V. Proper voltage shouldread 5.8V. In turn D502 would read 5.6V. When the voltage at D502dropped to 4.8V, waveform was distorted and unit would sh
WHITE H BAND ON THE SCREEN, R520 INCREASED IN VALUE After ten minutes of operation, this receiver displayed aone-half inch white horizontal band at the top of the screen. Verticalsize and linearity were not affected.
SNOWY PICTURE, REPLACE D2214, Q2224, Q2220 & UHF TUNER Snowy picture on all channels except Ch. 2. The reason youwould get a clear picture on Ch. 2 is due to the low voltage used onCh. 2 coming through the UHF tuner.
PICTURE DISTORTION, C544 OPEN Set came in with narrow picture, pincushion distortion andvideo smearing. The 200 volt line measured about 140 volts.
VERTICAL ROLL ON WEAK SIGNAL CH., RESOLDERED R581 Vertical roll on weak signal level. No problem on strongvideo signal.
VHF CHANNEL FADE OUT After 30 min. to 1 hour of operation, low VHF channels fadeout.
INTERMITTENT MECHANICAL OPERATION, POOR GROUND CONNECTION Intermittent door opening. S953 on the motor: one side ofswitch was not tight due to no threads.
POOR FOCUS AFTER WARM-UP After warm-up, picture would go out of focus. Found REDpicture tube focus shorting inside tube. This caused blue and green togo out of focus, since all three tubes (focus) are connected to the sameblock.
BEAT PATTERN IN THE PICTURE, RE-ROUTED CABLES P2 AND P3 There was a beat pattern in the form of a 1 inch vertical lineabout 2 inches in from left side, on ch. 7 only. Moving the AC cordwhere it was connected to the D board would increase or decrease theproblem.
RASTER WITH RETRACE LINES Set came in with all white raster with retrace lines. Audiowas OK.
PICTURE UP/DOWN BUTTON STUCK, REPLACE S004/005/006 Picture up button was stuck. Therefore volume up/down andpicture up/down or channel up/down would not work. Found picture upbutton was worn. This switch was spring loaded in rather than out.
DARK PICTURE, OPEN R541 AND SHORTED C531 Dark picture, slight retrace lines. No screen voltage toCRT G2.
NO COLOR, REPLACE IC-501 Picture was dark and also had loss of color. Scoping IC501Pin 15, horizontal sync pulse was only 6 VPP - should be 11VPP. I haveseen other sets that displayed intermittent dark picture or change of hueonly. All are related to IC501 sync output. The s

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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