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Electronic appliance repair tips database - TV (LCD,TFT,Plasma,Digital), Monitor, VCR, DVD recorder and player, Digital camera, Audio equipment, Microwave ovens, Phone systems, Computer repair
Make
Model
Problem
Solution
Date
Found: 8
Hitachi
G7
PSL
Excess bright raster
RGB colls low volts - Q801 BC558B leaky (on main pcb)
14-09-04
Hitachi
G7
PSL
Field chip has short life
Add 2 x 33v zeners in series - cathodes to pin 2 IC601 & anode to chassis - if this has no effect , could be crt flashover
14-09-04
Hitachi
G7
PSL
Field jitter when hot
D601 1N4002
14-09-04
Hitachi
G7
PSL
Field non lin
C712 2200µ 50v & C606 680µ 16v
14-09-04
Hitachi
G7
PSL
No signals - osd searches
Tuning volts missing VT pin tuner, R044 12k o/c
14-09-04
Hitachi
G7
PSL
NO TUNING - JUST SNOW ( TUNING BAR PRESENT ON SCRE
R044 12k OC. ZD002 ( 33V Zen ) Q003
14-09-04
Hitachi
G7
PSL
St/by only
Q781 2SD1884 LOPTr, Q903 BUT12AF chopper tr & ZD903 P6KE180A overvolts zener s/c - R760, R761, R762 & R766 2R2 ?w hi res
14-09-04
Hitachi
G7
PSL
2
St/by only
ZD903 130v zener s/c; C906 4µ7 250v hi esr; R901 6R8 5w o/c;Q903 BUT12AF s/c; F901 2.5A o/c - all caused by dry joints T901
14-09-04
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