Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 78151
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INCORRECT TUNING OPERATION TV would scan but would not stop on stations.
DEFECTIVE SIDE PLATES Plastic handle side plates on this model break. Handle sideplates may not be strong enough to carry weight of this model under allstress conditions.
POOR H SYNC Set displayed poor horizontal sync.
COLOR DISTORTION, REPLACE IC301 No blue, yellow picture. Base voltage at Q701 was 0 volts.Output at Pin 28 at IC301 0 volts, input to IC good.
NO PICTURE Loss of vertical deflection.
SHUT DOWN, REMOVED L810 This unit would shut down by itself. The picture wasexpanded in size (a lot of overscan). The HV was 3KV lower.
SOUND NO MUTE DURING CHANGE, REPLACED Q042 Sound would not mute during channel change. Checked Pin #13of IC032 positive pulse was present during channel change, therefore,Q042 was suspected.
CLOCK DISPLAY DIMS, REPLACED DISPLAY Clock display dims when touched by hand. Display flickerswhen someone walks by TV.
NO COLOR, REPLACED SHORTED CV301 After about 2-3 minutes of playing time color disappeared.Found CV301 actually physically shorted to 0 ohms.
NO UHF, REPLACED Q203 During programming unit would skip UHF band. 12V B+ was low(10.5V), Q203 was bad.
INCORRECT FUNCTION FOR TUNING, Q2211 LEAKY During programming unit would not stop on active channels inone direction from low to high.
NO TUNING LOCK, REPLACED C219 Would not lock on to any channel in program. AFT voltage pin#10, IC201 down to 0.4V.
CHANNEL DRIFT, REPLACED IC2003 Set would drift off channel during operation. Found IC2003(display memory) apparently loading control IC and changing PWM voltage.
RETRACE LINES, BROKEN LAND ON C BOARD Servicer informed me of a problem where the picture would benormal and then get brighter and go into retrace and then back to normal.Then it again would repeat itself.
DEAD, REMOVE JW54 AND OTHERS No operation above 100VAC. H. voltage was at 23KV. Servicerhad replaced flyback and IC501. Voltage to shutdown circuit was 5.7V.Removed L801, H. voltage went up to 26KV. -HQ COMMENTS: We will publish updated info on this problem shortly. Asfor now c

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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