panasonic Z4 Chassis Repair Tips

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Results 15

Make	Model Ch.	Symptom	Problem Solution
Panasonic	Z4 Chassis	When chan stored in a prev stored location, all chans appear the same	Check for dry joints around link J10 on Txt pcb
Panasonic	Z4 Chassis	The Panasonic Z4 Chassis	See TV Mag Sept - Nov 1994
Panasonic	Z4 Chassis	Slight tuning drift, no sound, no Vol OSD (other OSD OK)	Insufficient sync drive to Q1272 base. C524 180pF connected to pin 14 IC521 leaky
Panasonic	Z4 Chassis	No video with faint unsync lines in background	Sync pulses leaving pin14 IC521 poor - 180pF cap connected to this pin leaky
Panasonic	Z4 Chassis	No sync	Comes from Txt board where IC3507 MAB8461-PW216 was faulty (dis pins 2 & 3 to check)
Panasonic	Z4 Chassis	No sound and half a pic (shifted over)	C503 0µ01 cap across line shift control leaky
Panasonic	Z4 Chassis	Letter "C" displayed towards left/centre of screen	Reset micro by pressing VOL- button on TV whilst pressing Timer button on Hset - Oks then displayed
Panasonic	Z4 Chassis	Int loss of sound	Check conns to speakers
Panasonic	Z4 Chassis	Field int collapses or rolls	C402 3µ3 tant cap in Field osc stage
Panasonic	Z4 Chassis	Dead after initial burst of life	Trips even with LOP stage dis'd - fault in prot cct - Q558 2SA879 faulty tho checked ok out of cct
Panasonic	Z4 Chassis	Dead - surge lim res R802 4R7 5W o/c	STR54041M IC801 & Q801/2 s/c & D854 overvolts prot diode s/c. C809 0µ1feedback cap was the cause (caused excessive HT) also change C808 10µ 63v
Panasonic	Z4 Chassis	Dead - blank raster when optocoupler overidden	No activity from main micro - IC1202 EEPROM ST24C02A faulty
Panasonic	Z4 Chassis	Comes on with field collapse - gradually opens up then int shuts down	C462 470pF ceramic cap leaky in FOP cct
Panasonic	Z4 Chassis	Col int low or absent	C2651 0µ01 sm int o/c
Panasonic	Z4 Chassis	Bright green at sw on & int cuts out	C350 on crt base