Service manuals, schematics, eproms for electrical technicians

PANASONIC TX-21S3TC

TV - EPROM
Type: (ZIP)
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236.0byte
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Category
TV
EPROM
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  • Also known:
    PANASONIC TX-21S-3TC TX21S3TC TX 21 TC 21S3TC TX-21S3TC
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Relevant TV forum topics:
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 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

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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 
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