panasonic Repair Tips


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MakeModel Ch.SymptomProblem SolutionSolutionBy:
PanasonicZ421V TX21GV1
Int switches off & onIC1807 TOP210 chopper chip
PanasonicZ421V TX21GV1
Flyback lines at top - Txt OKRemove by going thro' self test proc - press vol down on set & status button on hset
PanasonicZ4 TX21M1T/BK
Blanking from LHS with ragged edges10µ 250v on main pcb rear edge
PanasonicZ4 TC15M1RP
Dead with STR54041 & 2SD965R Trs s/calso 4R7 surge res o/c - also replaced 10µ 63v & 100µ 6v3 elects on psu pri & check for dry joints
PanasonicZ4 Chassis
When chan stored in a prev stored location, all chans appear the sameCheck for dry joints around link J10 on Txt pcb
PanasonicZ4 Chassis
The Panasonic Z4 ChassisSee TV Mag Sept - Nov 1994
PanasonicZ4 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
PanasonicZ4 Chassis
No video with faint unsync lines in backgroundSync pulses leaving pin14 IC521 poor - 180pF cap connected to this pin leaky
PanasonicZ4 Chassis
No syncComes from Txt board where IC3507 MAB8461-PW216 was faulty (dis pins 2 & 3 to check)
PanasonicZ4 Chassis
No sound and half a pic (shifted over)C503 0µ01 cap across line shift control leaky
PanasonicZ4 Chassis
Letter "C" displayed towards left/centre of screenReset micro by pressing VOL- button on TV whilst pressing Timer button on Hset - Oks then displayed
PanasonicZ4 Chassis
Int loss of soundCheck conns to speakers
PanasonicZ4 Chassis
Field int collapses or rollsC402 3µ3 tant cap in Field osc stage
PanasonicZ4 Chassis
Dead after initial burst of lifeTrips even with LOP stage dis'd - fault in prot cct - Q558 2SA879 faulty tho checked ok out of cct
PanasonicZ4 Chassis
Dead - surge lim res R802 4R7 5W o/cSTR54041M 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
PanasonicZ4 Chassis
Dead - blank raster when optocoupler overiddenNo activity from main micro - IC1202 EEPROM ST24C02A faulty
PanasonicZ4 Chassis
Comes on with field collapse - gradually opens up then int shuts downC462 470pF ceramic cap leaky in FOP cct
PanasonicZ4 Chassis
Col int low or absentC2651 0µ01 sm int o/c
PanasonicZ4 Chassis
Bright green at sw on & int cuts outC350 on crt base
PanasonicZ4
Tuning drift - sound muted.C524 ( 180pf ) leaky.