hitachi Repair Tips


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Results 930
MakeModel Ch.SymptomProblem SolutionSolutionBy:
HitachiG7PSL
St/by onlyQ781 2SD1884 LOPTr, Q903 BUT12AF chopper tr & ZD903 P6KE180A overvolts zener s/c - R760, R761, R762 & R766 2R2 ½w hi res
HitachiG7PSL
NO TUNING - JUST SNOW ( TUNING BAR PRESENT ON SCRER044 12k OC. ZD002 ( 33V Zen ) Q003
HitachiG7PSL
No signals - osd searchesTuning volts missing VT pin tuner, R044 12k o/c
HitachiG7PSL
Field non linC712 2200µ 50v & C606 680µ 16v
HitachiG7PSL
Field jitter when hotD601 1N4002
HitachiG7PSL
Field chip has short lifeAdd 2 x 33v zeners in series - cathodes to pin 2 IC601 & anode to chassis - if this has no effect , could be crt flashover
HitachiG7PSL
Excess bright rasterRGB colls low volts - Q801 BC558B leaky (on main pcb)
HitachiG7PS2
When tried to tune in the correct display appearedThe 33V tuning voltage supply was missing because R044 ( 12k ) was open-circuit.
HitachiG7PS2
STANDBY ONLYIC703 DRY JOINTS
HitachiG7PS2
Shuts down aft 20 secs with buzzIn prot mode (shutdown volts at pin 20 TA8690AN) ZD701 3v9 zener leaky
HitachiG7PS2
OSD NOT CLEARINGDOO7 HIGH
HitachiG7PS2
No signals Tuning bar moves as if tuning but no vaCheck R044 ( 12K )
HitachiG7PS2
No OSD set works okReplace HD401314RS
HitachiG7PS2
INT. FLAG WAVING AFTER TELETEXT USEIC2002 ( TEXT PCB )
HitachiG7PS2
INT DEAD39K - 82K POWER SUPP - ALSO D/J on reg 12V (EDGE OF PCB BY LOPT. )
HitachiG7PS2
INT DEADZD901 6v8 zener
HitachiG7PS2
HIGH EHT WITH SET TRIPPING TO SBY INSTANTLYR909 39K HIGH also replace ZD903
HitachiG7PS2
Fails to startR902 & R903 ( 82K )
HitachiG7PS2
Dead.112v rail high R716 ( 51k ) o/c.
HitachiG7PS2
DEAD , 130v ZENER s.c.REPLACE R909 39K EVEN IF READS OK.