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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
G7P
Int start up
C912 4n7 across TDA4600 faulty
14-09-04
Hitachi
G7P
Nicam poor with clicking
Adj coil L5 on panel between Txt & Nicam boards
14-09-04
Hitachi
G7P
No line sync - pic displaced to right
No line pulses IC701 pin12 - R726 2R2 o/c (also check R605)
14-09-04
Hitachi
G7P
NO MEMORY STORE
CHECK R173 , R174 , R723
14-09-04
Hitachi
G7P
NO PIC JUST SNOW , NO CONTROLS OR REM WORK
IC601 FIELD CHIP AN5521 ( CHECK FOR FIELD PULSES AT PIN 15 OF IC101 )
14-09-04
Hitachi
G7P
NO TUNING
R138 ( 10k ) OC.
14-09-04
Hitachi
G7P
No Txt - P100 only
C2109 820pf
14-09-04
Hitachi
G7P
Set dead H.T. high & tripping
ZD903 & R909 ( 39K )
14-09-04
Hitachi
G7P
Set dead many semis in PSU s/C
Replace Q903 Q904 : R909 R912 R902 R903 R760 R761 R762 R766 R901 : ZD903 Check Q781 & D782 Replace 2.2ohm across Q760
14-09-04
Hitachi
G7P
Sometimes starts then cuts out after few mins
R919 , R920 ( 100k ) feed to TDA4601 gone high.
14-09-04
Hitachi
G7P
St/by only after trying to start
s/c across 27v rail as IC601 TA8427K is s/c
14-09-04
Hitachi
G7P
Txt missing
Xtal X2231 in txt cct
14-09-04
Hitachi
G7P
Won't store chans
D706 & R723 in lop stage dry jointed or faulty
14-09-04
Hitachi
G7P Mk2
Blank white raster.
C711 dry jointed by LOPTX.
14-09-04
Hitachi
G7P Mk2
buzz on sound - flat pic
vid det coil L202
14-09-04
Hitachi
G7P Mk2
Dead
TDA4601 chopper chip - also replace C914/5/6/7
14-09-04
Hitachi
G7P Mk2
Dead - HT high
X ray prot operating due to R716 51k res dry jointed
14-09-04
Hitachi
G7P Mk2
Dead R901 3R9 7w surge lim res o/c
C919 4n71kv leaky & check C928 2n2 2kv
14-09-04
Hitachi
G7P Mk2
Dead with only 33v HT at LOPtr
C909 150µ 400v mains smoothing cap o/c
14-09-04
Hitachi
G7P Mk2
Field bounce or st/by only
IC703 MC7809 9v reg dry jointed or faulty
14-09-04
Hitachi
G7P Mk2
FOP chip has short life
Check HT is not too high - if so U know what to do!
14-09-04
Hitachi
G7P Mk2
Goes off aft half an hour
Dry joints C711 47µ 200v
14-09-04
Hitachi
G7P Mk2
Green raster with flyback lines
R808 22k ?w o/c
14-09-04
Hitachi
G7P Mk2
grey raster with fb lines
C711 47µ 200v bulging & faulty by LOPTx
14-09-04
Hitachi
G7P Mk2
int pic size/ht
C906 4µ7 250v
14-09-04
Hitachi
G7P Mk2
Mass of lines at centre of screen
Comes/goes with board flex - C702 dry joints - near IC701 FOP chip
14-09-04
Hitachi
G7P Mk2
NO GO
R920 100k OC
14-09-04
Hitachi
G7P Mk2
no sound or pic - ht ok
field collapse. No 9v to field chip as MC7809 IC703 o/c
14-09-04
Hitachi
G7P Mk2
No start up
C911 82pf across pins 2 & 3 TDA4601 psu chip
14-09-04
Hitachi
G7P Mk2
no tuning
R044 12k 0.5w o/c ZD002 30v tuning volts diode o/c
14-09-04
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