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Panasonic Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
PANASONICALPHA 1
Tda4505m-n3 replacement by tda4505eChange r113 from 22k to 470k; r112 1m5 to 470k & re-align afc as nec
PANASONICALPHA 1
Squealing.Line drive transformer.
PANASONICALPHA 1
ScreamsHt=20v lop tr 2sd1439 leaky cp567 1a cct prot o/c
PANASONICALPHA 1
Replacing tda4505m-n3 with tda4505eChange r113 from 22k to 470k; r112 from 1m5 to 470k; align afc for optimum pic
PANASONICALPHA 1
Replacement of tda4505m-n3You can use cheaper tda4505e if r113 changed from 22k to 270k, r112 from 1m2 to 470k & re-align afc coil
PANASONICALPHA 1
Remote commands int ignoredDry joint x3505 xtal on txt pcb
PANASONICALPHA 1
Reduced top frame after a few minutes.Scan coils!
PANASONICALPHA 1
Raster - blanking out.Ic801.
PANASONICALPHA 1
Q551 keeps blowingCheck dry-joints on line output transformer
PANASONICALPHA 1
Plain blank raster & no sound , no osd sync - ok via rear sockets.Replace ic101 ( tda4505m ) in side can middle of chassis.
PANASONICALPHA 1
Pic goes in from rh side with black line across centreDry joints field o/p chip
PANASONICALPHA 1
Pic brightens & drops with dist field scan when heatedScan coils faulty - reqs replacement of crt as they are bonded
PANASONICALPHA 1
Off - safety res r851 2r2 o/c when replaced loud buzzWhen base of line driver tr lifted buzzing stops. no line drive replaced tda4505m-n3 jungle chip (must be correct suffix)
PANASONICALPHA 1
No sound/pic off air or via scartIc2601 m51320p av sw chip - to check, remove chip & jumper i/p & o/p pins
PANASONICALPHA 1
No sound or picture - squealing.Line drive transformer.
PANASONICALPHA 1
No pic/sound - chan ind lit, psu whiningC808 hi esr, r567 pt no tsf19102 (fuse) - used 1.4a wickman
PANASONICALPHA 1
Not cabbageReplace sub carrier trimmer and adj; check pal delay line by subst
PANASONICALPHA 1
Loptr q551 int blowsCheck dry joints line dr trfmr & r567 1a fusible resistor
PANASONICALPHA 1
Lines with whistleC808 10ยต 63v
PANASONICALPHA 1
Lack of height - lin okFit 3r3 resistor across r461 to increase height