panasonic Repair Tips

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Make	Model Ch.	Symptom	Problem Solution
Panasonic	Z4	TUNING DRIFT NO SOUND NO SOUND OSD	Q1272 3 4 OR MORE LIKELY C524 180pF
Panasonic	Z4	TUNING DRIFT	TUNER UNIT
Panasonic	Z4	SWITCHES ON BUT DIES	Q558 2SA879
Panasonic	Z4	Strange faults.	Reprograme microcomputer see Tv mag.
Panasonic	Z4	Stores one channel in all locations	EPROM (IC1202)24CO2AB1
Panasonic	Z4	STATIONS TUNED TO ONE POSITION ALREADY HOLDING TU	CHECK AROUND TEXT PCB LINK J10 etc
Panasonic	Z4	set displays "C" in left Centre of screen	Micro req's reset Hold down VOL button on set while pressing TIMER but on Handset Should display colum of OK's & reset
Panasonic	Z4	POWERS UP THEN GOES DEAD	CHECK Q558 , Q541 , Q542
Panasonic	Z4	Over bright picture - with flyback lines.	R380 ( 680k ) o/c not through PCB properly.
Panasonic	Z4	NO VIDEO , FAINT LINES IN BACKGROUND	180pf CAP PIN 14 , IC521
Panasonic	Z4	NO SYNC ( CLOCK AND DATA LINES SHOW LOWER THAN NOR	MAB8461-PW216 TEXT CONTROL IC. - IC3507
Panasonic	Z4	No sound for 1st 1/2 hour pic shifted to one side	C503 ( 0.01uF )
Panasonic	Z4	Line osc running fast	AN5603K IC601 faulty
Panasonic	Z4	Letter 'C' towards left centre of screen.	Reprograme microcomputer see Tv mag.
Panasonic	Z4	Int no pic =- OSD ok	crack in print on video board between Q302 em & C302
Panasonic	Z4	INT FIELD COLLAPSE	Check V at pin 2 IC451 if high replace C402 3.3mfd , BLUE TANT on C board
Panasonic	Z4	Int failure to start	Check dry joints but LOPTr was responsible this time
Panasonic	Z4	INT CHROMA	C2651 INT OC ON BOARD C NEAR IC2651 ( CHROMA SWITCH IC )
Panasonic	Z4	Flyback lines - over bright picture.	R380 ( 680k ) o/c not through PCB properly.
Panasonic	Z4	FIELD ROLL FROM COLD	C402 3u3 TANTALUM US