"ac" wrote in message
...
I have a goodmans 3375 TV that has just gon pop. It was blowing the
internal
2a fuse as soon as it was powered. I found that 2 of the rectifier diodes
had shorted, and 1 main transistor in the PSU area was also dead.

After removing the transistor and replacing the diodes, the fuse no longer
blows. I will have to order the transistor. Meantime, attached is a
circuit
diagram. The big transistor that blew is TR15, (S2000AF). I have checked
the
2 diodes, D35 & D36 near to it - these are ok. Would there be anything
else
to look for or would TR15 have blown 1st and taken out the rectifier
diodes.

Should I still get voltages out of IC14 without the TR15 in the circuit or
could that be blown as well ?

Diagram : http://www.photo-it.com/3375.jpg


The TDA 4601 IMO is one of the best power supplies ever, looking at that
particular circuit I believe that it's a pretty bog-standard Thomson [F1?]
chassis.

A coincidence but I repaired one today, it wouldn't run [had horrendous
squealing noises coming from the power supply] replacing 'all' of the small
electrolytic capacitors cured the problem.

Also it's quite common for those stupid little underrated INxxx type diodes
in the bridge rectifier circuit to go short circuit for no apparent reason,
I would suggest uprating them for something a little more substantive, or
replacing them with a decent bridge rectifier, hope this helps.




Cheers

Adam