Service manuals, schematics, eproms for electrical technicians
PANASONIC TX-W28D5F
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959.0byte
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TV
EPROM
TV
EPROM
If you get stuck in repairing a defective appliance download this repair information for help. See below.
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Good luck to the repair!
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Looking for similar panasonic manual?
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- Also known:
PANASONIC TXW-28D-5F TXW28D5F TXW 28 TX W28D5F TX-W28D5F
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Relevant TV forum topics:
Sziasztok.
Az a gondom ezzel a szerkezettel hogy nem akar jó szívvel indulni. Ha röviden nyomom a csatorna gombot csak egyet pislog és nem indul. Ha hosszan lenyomva tartom elindul és utána jól megy. Kondikra gyanakodtam de nem igazán jöttem rá a hibára. Valakinek esetleg volt hasonló problémája?
Szevasztok!
Fenti tv-nek az HFB felső kapacitív tagja (C430/681), szétégett.
Az ettől létrejövő nagy HFB impulzus az (R420/10k) utáni két nagyon jó minőségű (D520;D521/ 4148) vágódiódát nem tudta tönkre tenni.
Az 5V-os táp felé kinyitott D520 "picit megemelhette" az 5V-os tápot, így a prociba akkora feszültség csusszant bele, hogy annak a normálist meghaladó mértékű felvett árama szénné tudta égetni a R420/10k ellenállást is.
Mivel ez így megégett, elképzelni tudom csak, hogy a processzorban előforduló P-N átmenetek milyen állapotban vannak.
Ha valamelyikőtöknek van ilyen, egy nagy csomó, egészséges P-N átmenetet tartalmazó tokja, örömmel venném. A gazdája nem különben.
Ezt a Herculest úgy hívják hogy: TDA12021H1/N1001, de ugyan ez előfordul TDA12021H1/N1/D01, és TDA12021H1/N1/F01 néven is.
üdv
This elderly monster arrived with the error “ 4 blinks “ which the manual suggests is a power board fault
There are TWO power boards and a standby power board inside
On removing rear cover there were two swollen 220uf caps on the standby board, sadly replacing them the 4 blinks remained
Swapping the two power boards over[ as they look identical , gives a “ 2 Blink “ error , the limited info in the manual suggesting that the fault is on the lower board [ main 2 ]
Both boards have a PFC voltage of around 380 volts at switch on before the relays click out
I have done cold checks on both boards and there are no obvious differences
As the manual has only a block diagram of the power supply it’s difficult to be sure of values / voltages
Has anybody seen or worked one of these or similar beasts and managed to diagnose the problem
Thanks for looking
Regards Ken
There are TWO power boards and a standby power board inside
On removing rear cover there were two swollen 220uf caps on the standby board, sadly replacing them the 4 blinks remained
Swapping the two power boards over[ as they look identical , gives a “ 2 Blink “ error , the limited info in the manual suggesting that the fault is on the lower board [ main 2 ]
Both boards have a PFC voltage of around 380 volts at switch on before the relays click out
I have done cold checks on both boards and there are no obvious differences
As the manual has only a block diagram of the power supply it’s difficult to be sure of values / voltages
Has anybody seen or worked one of these or similar beasts and managed to diagnose the problem
Thanks for looking
Regards Ken
Kijelző VES480QNSS-3D-U01
17MB100.
Nem gond, ha nem Panasonic, csak passzoljon a kijelzőhöz.
17MB100.
Nem gond, ha nem Panasonic, csak passzoljon a kijelzőhöz.
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