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hitachi P50TO1u psu problem.

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buncey:
hi got a hitachi P50TO1u plasma in. set is dead suspect psu problem.

on inspection i noticed 1 trace was burned on underside of psu board.

also 2 resistors had burnt out.

repaired the trace and replaced both burned out resistors.

tested tv on low voltage on the variac.

i have noticed the 2 new resistors i replaced on the psu are overheating and getting red hot to the touch..

anyone have any ideas or come across this set or psu.

i have attached a picture of board.

thanks

ozzietech:
Hi buncey, sounds like a short in the primary, possibly one or more of the FETs have gone down. Those plug in boards on primary side should be checked also for dry joints or shorted components.

buncey:
hi ozzietech checked the fets while onboard and they seems ok.

also removed the plug in board done a reflow incase of dry joints but the  resistors still heating up? .

Turnip:
Hi Buncey,

Your pic was great but didn't show resistors mentioned. Could you do it from the other end, as it seems a mains input problem  ?  - Chris.

buncey:
hi chris.

i have took a picture from the other end mate.

you can see the 2 new ceramic resistors in place where the glue i used to hold firmly in place has remelted and made a mess due to the 2 new resistors getting red hot again..

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