Dicas Reparação

Modelo - Chassis

Pesquisa: Enviar Dica Resolvida
Resultados 78866
Pedir dica reparação
NO VIDEO OUT, REPLACED Q1343 No video out. Traced problem to BD board. 12VDC regulatorleaky. Voltage reading was 10VDC, should be 12VDC. This caused incorrectbias to be applied to RGB drive transistor via BD cutting off the drivetransistors.
SHORTED CRT The picture tube shorted causing a chain reaction ofdestruction. The HVR block was found defective. Also found were shortedhoriz, output transistor, shorted reguator transistor, and a bad flyback.
130V WOULD NOT REGULATE 130V would not regulate. All components in power supplychecked good.
MECHANICAL INCORRECT OPERATION The doors would operate only intermittently on this unit.I found that motors for the left and right sides had come loose.
COLOR ON B/W PICTURE, ADJ CV-301 Color confetti on B/W telecast.
LOSE COLOR, REPLACE X001 When unit was turned off/on color would lock in. Turn off/onagain and you would lose color and the channels would not change.
INTERMITTENT PICTURE SHRINK, REPLACED IC601 Picture shrinks intermittently. Stations shift when pictureshrinks.
DEAD SET, REPLACE R570 AND H OUT After about 15 min. horizontal output transistor (2SD957A)would short out. During the first 15 min. transistor would increase intemperature. Found R570 was reading less than 0.2 ohm - should be 0.22ohm - was able to put in a 0.23 ohm and everything rem
JAIL BARS ON THE SCREEN, CHANGED D250 This unit had faint jail bars on left side of picture.
AUDIO BUZZ ON SCRAMBLED STATIONS, ADJ T204/205 SIF Audio buzz on scrambled stations only. The following stationsexhibited the problem: HBO (ch. 30), Showtime (ch. 34) and Cinemax(ch. 38). They use Jerrold Box (New England Cablevision Cable Co).
AUDIO BUZZ ON SCRAMBLED STATIONS, ADJ SIF T204 AND T205 Audio buzz on scrambled stations only (HBO & Cinemax).
PIC FOLDS OVER AT TOP, R520 DECREASED IN VALUE Unit had 1/2 inch of fold over top of screen. Found R520reading 8.1K (should be 10K), upsetting bias on vertical outputs.
RELAY CHATTERING, RESOLDER D602 Power relay RL001 would not stay engaged when power on buttonwas depressed. The new MF board didn't cure the chattering relay problem.
DARK PICTURE, REPLACE C548 Dark picture, sometimes blowing fuse and regulator. Fivecases have come to our attention of this problem, which is caused by C548being shorted or leaky. Attached are samples for evaluation.

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.

Verifique se o esquema está disponível na área de downloads