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Pioneer PDP-433MXE Power Supply fault

I

Ian French

Jan 1, 1970
0
I am attempting to repair the Power Supply Unit ( board number PCB2310
A06-12196B MDK79V-0) fitted to a Pioneer plasma panel PDP-433MXE (similar to
a PDP-503MXE).
I have found most of the faulty components, caused by the failure of Q127,
and its source resistor, but I don't know what caused Q127 to fail in the
first place. I have traced out part of the circuit (schematic) and have
tested all of the likely items.

I am unable to find a service manual on the web which contains a circuit
diagram, but I have found some references to this fault on a Russian
website, only problem is I don't read Russian ! Even so this has been
usefull in identifying some of the failed components.

Does anyone out there have a circuit / schematic for the power supply which
I can have, or does anyone know what causes this fault?

Any help would be most appreciated.

Thanks.

Ian.
 
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