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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: 901
Hitachi
G7PS
Striations on lh side - ok from scart
L101 choke in 12v supply faulty
14-09-04
Hitachi
G7PS C21119T
Field collapse int
D601 1N4002 flyback boost diode going int o/c
14-09-04
Hitachi
G7PS C2114
Reverts to st/by when r/c operated after set been on several hours
Also when Chan 8 selected set goes to Ch 9 - IC001 micro TMP series replaced
14-09-04
Hitachi
G7PS C2114T
Sound absent & streaky white lines on pic when cold
C955 47µ 25v in 15v smoothing supply
14-09-04
Hitachi
G7PS C2114T
Stuck in st/by
HT ok at 112v - cause was FOP chip TDA8274K
14-09-04
Hitachi
G7PS C2119T
St/by only
R903 82k by chopper tr hi res, or IC601 LA7836 fop chip
14-09-04
Hitachi
G7PS Mk2
Field collapse 1cm high
IC703 AN7809 9v reg leaky
14-09-04
Hitachi
G7PS2
BRIGHT WHITE THEN FIELD COLLAPSE
CHECK Q801 SC
14-09-04
Hitachi
G7PS2
DEAD , 130v ZENER s.c.
REPLACE R909 39K EVEN IF READS OK.
14-09-04
Hitachi
G7PS2
Dead.
112v rail high R716 ( 51k ) o/c.
14-09-04
Hitachi
G7PS2
Fails to start
R902 & R903 ( 82K )
14-09-04
Hitachi
G7PS2
HIGH EHT WITH SET TRIPPING TO SBY INSTANTLY
R909 39K HIGH also replace ZD903
14-09-04
Hitachi
G7PS2
INT DEAD
ZD901 6v8 zener
14-09-04
Hitachi
G7PS2
INT DEAD
39K - 82K POWER SUPP - ALSO D/J on reg 12V (EDGE OF PCB BY LOPT. )
14-09-04
Hitachi
G7PS2
INT. FLAG WAVING AFTER TELETEXT USE
IC2002 ( TEXT PCB )
14-09-04
Hitachi
G7PS2
No OSD set works ok
Replace HD401314RS
14-09-04
Hitachi
G7PS2
No signals Tuning bar moves as if tuning but no va
Check R044 ( 12K )
14-09-04
Hitachi
G7PS2
OSD NOT CLEARING
DOO7 HIGH
14-09-04
Hitachi
G7PS2
Shuts down aft 20 secs with buzz
In prot mode (shutdown volts at pin 20 TA8690AN) ZD701 3v9 zener leaky
14-09-04
Hitachi
G7PS2
STANDBY ONLY
IC703 DRY JOINTS
14-09-04
Hitachi
G7PS2
When tried to tune in the correct display appeared
The 33V tuning voltage supply was missing because R044 ( 12k ) was open-circuit.
14-09-04
Hitachi
G7PSL
Excess bright raster
RGB colls low volts - Q801 BC558B leaky (on main pcb)
14-09-04
Hitachi
G7PSL
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
G7PSL
Field jitter when hot
D601 1N4002
14-09-04
Hitachi
G7PSL
Field non lin
C712 2200µ 50v & C606 680µ 16v
14-09-04
Hitachi
G7PSL
No signals - osd searches
Tuning volts missing VT pin tuner, R044 12k o/c
14-09-04
Hitachi
G7PSL
NO TUNING - JUST SNOW ( TUNING BAR PRESENT ON SCRE
R044 12k OC. ZD002 ( 33V Zen ) Q003
14-09-04
Hitachi
G7PSL
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
G7PSL2
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
Hitachi
G7PSMK2
Dead - HT at 145v.
R909 high.
14-09-04
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Last SM download : Janome 551-E, 552
script execution: 0.14 s