Dicas Reparação HITACHI




Modelo - Chassis


Pesquisa: HITACHI Enviar Dica Resolvida
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MarcaModelo
(Chassis)
SintomaCausaSoluçãoPor:
HitachiCPT2656 Sal L
Dead300v ACROSS C707 BUT NO S2000AF COLL VOLTS R707 22ohm o/c T701 s/c
HitachiCPT2656 Sal L
BLANK RASTER , NO SOUND . TDA4505 us . MAY HAVE TO, RB135 TO 470K , RB122 AND 123 TO 220K , RB110 TO 1.5M , CB130 TO 33pf , RB128 AND RB587 TO 3.3K. IF NO COLOUR AND LINE TWITCHI
HitachiCPT2656 Sal J
Bottom cramp - top widened out.Linearity pot RTB573 ( 470R )
HitachiCPT2656
To tune in chans 1 -4Enter service mode & sw off bit 0 - the little dot
HitachiCPT2656
Dead - supply lines low & chirp at sw offD508 BY228 in lop leaky
HitachiCPT2656
Bottom cramp - intPreset RTB573 470R
HitachiCPT2655
Dead supply line lowD508 in line stage
HitachiCPT2650 Sal J
Startup - Long time for picture to come on.Incorrect grey-scale setting.
HitachiCPT2598
Wavering picture with colour dropout which would randomly blank out to a blue screen in short bursts. Occasionally there would be no sound or vision at switch-on and only the channel change working.Replace C933 (2,200uF 25V) whose ESR had risen to 27 and C932 (470uF 16V) whose ESR had risen to 48. These two capacitors sit next to each other between the delay line and a heat sink. They were replaced with high temperature types.
HitachiCPT2598
No colour - ok on TxtChroma delay line
HitachiCPT2598
Field collR715 1R safety res, TDA3654 fop chip, D601
HitachiCPT2589
FRAME COLLAPSEREPLACE R715 AND IC601
HitachiCPT2508
TrippingReplace C910 & 916 33µ 10v; C919 4n7 2kv; C927 2n2 2kv. Change C914 to 10µ, check C909 150µ 400v, R919, R920, R931 & R932
HitachiCPT2508
Dead - Field coupling cap C610 100µ 25v explodedLow res across 152v line due to s/c between field & line scan coils
HitachiCPT2508
DeadQ901,IC901,R901,ZD901 4v7,D904,R913,C928 and C919. Also there was blown print between D904 and ZD901.


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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