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panasonic TH-42PX8BA dead

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t1412:
have you got a meter, check f402/pr401/glass type fuses and f403 wickman fuse. if ok then check diodes d419/420/429/435/439/  in both direction if ok brigde chip zn401 then transistors q406/q412/q413 and the 5 transistors on the large heatsink

cooper1973:
im not getting any reading at all from the bridge chip zn401 i have tried in both directions as i done with diodes. i take it i should get some sort of reading. the chip is open both ways

t1412:
if you can take it out of the circuit to get a proper test on the meter

shaun

cooper1973:
i had taken this out and still no reading on multimeter. i also took another one out that is also on the board and no reading on that either. on of the trasistors on the large heatsink is also showing no reading on one of the legs but others are fine

tv tony:
Please take this a bit of advice, not to be taken as an insult, but you are working with rectified mains (310v) and after pfc this can be approaching 400v. This can be a killer! A diode should conduct one way and not another, testing a bridge is similar. When you say the diodes are not conducting in either direction worries me, have you got your meter on the right range and function? Keep us posted if only to say you are not fried.
Regards,
tony walker

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