the HOT is fine, I snipped the diode, and its indeed bad, and that means the
STK is bad, and the 10uf cap in the primary caused it.


"Vince" wrote in message
...
Hi!
I have found that i can be either the diode that fernishes the power to
the
HOTr or the HOTr.unsolder to check, either one of these or the regulator
can
take out the fuse.
Vince
"Mike Bates" wrote in message
. ..
I got this set, friend wants it fixed.

He said the power button is messed up, and it doesnt turn on. well, I
seen
that it was a ctc187, I know thats not the case. I got the set, and
pressed
the button, it presses fine. I immidiately thought in my head, since I
worked on these before, the 10uf cap in the SMPS primary is gone, fuse
is
gone, and STK is wasted. thats what I first thought.


I took it apart, only to confirm my suspician, the fuse is wasted.


I pulled it out, here is the rundown so far: caps look normal, no
bloated
or
exploaded caps like on most of the ones I worked on.

The fuse is gone, the HOT is shorted, and 1 of the 2 secondary diodes is
shorted. The one that feeds the flyback and associated circuits is
shorted.

Ok, question. What caused the HOT to blow in the first place? flyback
possibly bad?

I got another board identical to it, that had a bad STK, and all the
power
supply caps. Everything was recapped, but the woman said she tossed it,
and
didnt want it fixed, so I never got the STK, and ended up robbing the
caps
and the NTSC processor for another set. The HOT and associated circuits
are
still OK.

I wonder if I should just pull the flyback and HOT, with the diodes, and
some blue pincussion caps and change them out?

any thoughts would be appriciated.

----
Mike