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chassis L6.2AA philips on a 28PT4472/01

 
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mansoult
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PostPosted: Tue Jul 11, 2006 3:02 pm    Post subject: chassis L6.2AA philips on a 28PT4472/01 Reply with quote

I own the full diagram of this 70cm TV but ... it never starts.everything seems to be OK in the power supply till now, I hear a noise: it is oscillating....I have put a lamp on the +150V dc at the place of the THT oscillator and it nevers lights on. The principal Mosfet Tr and the two regulating transistors are 3 new parts, all the diodes are OK (zeners also) and resistors seem to be also.there is no short-circuit on the output of the main little trafo. Who can help me further for this repair game? Many thanks in advance, Michel
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gary



Joined: 05 Apr 2005
Posts: 584
Location: MANCHESTER, uk

PostPosted: Tue Jul 11, 2006 4:27 pm    Post subject: Reply with quote

COMMON FAULT ON THESE SETS IS FAILURE OF 7505. REPLACE IT EVEN IF IT MEASURES OK.
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