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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: 1049
Panasonic
Z3 Chassis
Failed to start - int, with no R/C operation
5v supply from small trfmr at TPE2 = 4.4v; D1124 5v1 zener leaky
14-09-04
Panasonic
Z3 Chassis
Failure to start
R802 330k o/c - bias provider for chopper chip
14-09-04
Panasonic
Z3 Chassis
Field - reduced height with poor lin
C404 4µ7 50v
14-09-04
Panasonic
Z3 Chassis
Field lin - top stretched & bottom compressed
C458 4µ7 or 10µ 50v
14-09-04
Panasonic
Z3 Chassis
Field scan cramped at bottom at sw on
IC451 TDA3653C FOP chip
14-09-04
Panasonic
Z3 Chassis
Int dead
IC1101 reset line slightly low ; C1122 0µ01 leaky
14-09-04
Panasonic
Z3 Chassis
Int pic
Hairline cracks around line dr trfmr T531
14-09-04
Panasonic
Z3 Chassis
No color
C616 10nF 50v leaky - pin 29 IC101
14-09-04
Panasonic
Z3 Chassis
No start up
Works ok when pin15 (X ray prot) IC101 is grounded; R560 270k near plug E7 o/c
14-09-04
Panasonic
Z3 Chassis
Reverts to st/by with rush of EHT
HT correct - no line drive; removing prot tr Q451 revealed field collapse caused by D453 MA2270 zener diode - the cause of this fault was traced to flashover in crt
14-09-04
Panasonic
Z3 Chassis
St/by only
IC1101 micro pin 6 should be high (power on command) but wasn't as chip not being reset. IC1104 resets IC1101 when its supply reaches 5v but didn't reach this level as zener D810 in the 5v reg cct was leaky
14-09-04
Panasonic
Z3 Chassis
Trips at sw on
Check start up resistors R560 270k & R552 27k for hi res
14-09-04
Panasonic
Z3 Chassis
Tuning drifts
C17 10nF ceramic cap leaky
14-09-04
Panasonic
Z3-T
Replacement of TDA4505M-N3
You can use cheaper TDA4505E if re-align afc coil only
14-09-04
Panasonic
Z3-T
TDA4505M-N3 replacement by TDA4505E
Re-align AFC as nec only
14-09-04
Panasonic
Z3T
Brightness correct top left out bottom right.
Q306 collector-to-emitter leak.
14-09-04
Panasonic
Z3T
Dead - st/by only
No HT - STR54041 faulty
14-09-04
Panasonic
Z3T
Dead with squeal
LOPTr 2SD1439 leaky - used BU508D - resold Line dr tfmr T531
14-09-04
Panasonic
Z3T
Field collapse & lin int
Dry joints TDA4505 IF/timebase chip under metal can
14-09-04
Panasonic
Z3T
FIELD CRAMPING WHEN COLD
TDA3653C IC451
14-09-04
Panasonic
Z3T
Field scan distorted - int collapse
Dry joint IC101 IF/TB gen TDA4505M esp pin 2
14-09-04
Panasonic
Z3T
Startup - no start up - intermittent.
D1124 ( 5.1V ) zener leaky.
14-09-04
Panasonic
Z4
Blows lop transistors periodically
Check right type fitted - should be 2SD1541LB
14-09-04
Panasonic
Z4
BRIGHTNESS SLOWLY INCREASES UNTIL SCREEN COVERED I
R380 680k ON CRT PCB OC
14-09-04
Panasonic
Z4
Dead
270k START UP RESISTOR IN POWER SUPPLY OC
14-09-04
Panasonic
Z4
Dead
R802 4R7 o/c; IC801 STR54041 s/c; C808 10µ 63v, Q801 & 2 2SD965 leaky. Note:- C809 = 10µ 6.3v
14-09-04
Panasonic
Z4
Dead - slight eht rustle at sw on - no st/by
Works on reduced mains 100v; - STR54041-M
14-09-04
Panasonic
Z4
dead - STR54041 blown also Q801, 802, R802
happens every few weeks - checked mains plug & deguassing positor
14-09-04
Panasonic
Z4
DOTS ON PICTURE ONLY WHEN USED ON INDOOR AERIAL
DRY JOINT ON COIL INSIDE TUNER UNIT ( JUST ABOVE PIN FURTHEST FROM AER. SOCKET )
14-09-04
Panasonic
Z4
FIELD ROLL FROM COLD
C402 3u3 TANTALUM US
14-09-04
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