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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: 14
Panasonic
Alpha 4
Blank raster - sound ok - same on scart; on Txtshows "P100" at the top left and "*** TXT ***" flashing at the bottom centre of the screen.
Replace IC3002 (M52472P) on the "H" panel.
14-09-04
Panasonic
Alpha 4
Blank screen - OSD OK
9v supply to IF proc chip IC101 low at pin 41. R170 56R hi res
14-09-04
Panasonic
Alpha 4
Crackle from lh speaker
R2081 10k sm cracked
14-09-04
Panasonic
Alpha 4
Field - height increases when heated with twitching
C402 0µ33 mylar cap leaky in ramp gen cct
14-09-04
Panasonic
Alpha 4
Field cramp & buzz on sound
TDA3654 fop chip
14-09-04
Panasonic
Alpha 4
Inside the Panasonic Alpha 4 Chassis
See TV Mag June - Sept 1995
14-09-04
Panasonic
Alpha 4
int lines across pic
UHF tuner faulty
14-09-04
Panasonic
Alpha 4
No pic - sound ok
R539 10 ohms fuse resistor in supply to line driver transistor O/C.
14-09-04
Panasonic
Alpha 4
OSD consist of black boxes only - pic & Txt ok
C3304 0µ01 leaky & R3309 820R hi res
14-09-04
Panasonic
Alpha 4
Shuts down at sw on with a splutter - HT only 60v
LOPTx
14-09-04
Panasonic
Alpha 4
Won't power up - works if pins 3 & 4 of opto shorted
Q890 2SC3311-R leaky
14-09-04
Panasonic
Alpha 4 TX25X1
No pic - sound ok
TDA3654 FOP I.C. and 800mA fuse next to it
14-09-04
Panasonic
Alpha 4 TX25X1
PSU o/ps die aft brief period at sw on with field coll noticed
VDP3108-A-29 vid/deflect proc chip - NLA. Fit replacement kit with alternative chip
14-09-04
Panasonic
Alpha 4 TX25X1
Stuck in st/by perm
STR56041M PSU chip brought back life to psu but FOP chip & Audio O/P chips both faulty as well as IC1213 micro which, when replaced, gave no sync - IC501 TDA2579B also faulty
14-09-04
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