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Bush TV Dead MODEL: 5693D

I have replaced a burnt out Zener-Protected MOSFET Ref Q102, it will not start up.
Have checked most pwer supply components, LOPT etc but cannot pin point the problem

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Switch mode power supply? it has a in or primary side and out the secondary side of a switch mode transformer.

check the driver IC that runs Q102 it makes a oscillation that Q102 amplifies. now the secondary if has a short will blow the Q102 look for shorted rectifiers in the secondary and fuse resistors that are open, even go far downstream and check the HOT for short.

Posted on Feb 23, 2008

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