Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 77224
Pedir dica reparação
CHANNEL SEARCH DOESN'T STOP,REPLACED PARTS BELOW All indications were that set would tune properly but wouldovershoot each channel. Result was unstable sync and in general poorpicture quality. Pin 10, IC201 (CX555) AFT was reading approx. 9V vs2.5V. At Pin 2, IC033 (CX804) was reading approx. 10V.
NO REMOTE FUNCTION, REPLACED IC001 Remote does not work, manual OK.
NO CONTROL OF BRIGHTNESS No control of brightness, excessive brightness even withscreens and drives down, voltages OK in ABL drive circuits. Also incolor.
INCORRECT BRIGHTNESS OPERATION WITH RETRACE LINES Excessive brightness and retrace tube cathode voltages low,10V.
NO SOUND OR PICTURE, REPLACED IC2002 No sound or picture. Could not program any channels norwould the set change address positions.
INCORRECT CHANNEL INDICATION The channel indicator neon lamps are polarized and will notlight when soldered in backwards. The lamps are not marked as to whichway they are to be soldered in.
POOR V LINEARITY, R517 INCREASED IN VALUE Poor vertical linearity top 1/3 of picture slightlycompressed. Vertical size control to end of range. Waveform at base ofQ501, blanking pulse 5 msec, it should be 1.2 msec.
DEAD Dead set, 1.6 amp fuse blown, horizontal out transistorshorted, B+ regulator shorted.
INTERMITTENT SHUT DOWN, REPLACED R532 The set would intermittently shut down.
NO COLOR, RESOLDERED R356 No color. Checked CW signal at the collector of Q307 whichwas not there. Signal was present at the base. I checked the DCvoltage - collector was 18V, that told me that the transistor was notconducting. Base voltage was normal (3V) emitter was 2.8V.
GREEN PICTURE, REPLACED C323 Severe bright green screen no control.
SHUT DOWN, REPLACED C5112 Immediate shut down - no high voltage.
DEAD, BUSHING ON VERT OUTPUT WAS CARBONIZED Unit cannot be turned on. When the power switch is activated,unit comes on for 2 seconds and goes off. Checked and F6103 was foundopen. 120V line was loaded. When I checked resistance from 120V B+ toground, I read 150 ohms both ways. GA-9 (plug) Pin
NO AUDIO No audio - any function. Acts like bad function switchbecause if applied additional pressure on knob volume works - releaseknob - no audio.
DEFECTIVE MOTOR Tape player would not run. Motor seemed to draw excesscurrent. A check of the motor revealed the FG winding was shorted to themain winding.

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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