Got this set in a couple of weeks ago, the owners kid had spilled water
down the back and totally fried the power supply. After ordering some
original Sanyo parts and installing them, the set powered for a half second
and blew the chopper transistor again. Turns out there was a bad zener on
the secondary side. Fortunately I had ordered a spare chopper trans, so once
everything was patched up again the set powers but shuts down after a second
or two. The B+ is way down at 80V, for some reason the PS seems to be
over-regulating. Can't seem to find any more shorted components. With the
little 4-pin opto-isolater removed from the power supply, the B+ goes back
to normal but the power just cycles on and off. Am I probably looking at a
bad opto-isolater, or is there something else I'm missing?
Anyone have a schematic of the power supply, so I could have something to
go by?
Thanks for any help.

Chris I would certainly go for the Opto first.
Maybe bad cap in SMPS primary section.
kip
"Chris F." wrote in message
...
Got this set in a couple of weeks ago, the owners kid had spilled water
down the back and totally fried the power supply. After ordering some
original Sanyo parts and installing them, the set powered for a half
second
and blew the chopper transistor again. Turns out there was a bad zener on
the secondary side. Fortunately I had ordered a spare chopper trans, so
once
everything was patched up again the set powers but shuts down after a
second
or two. The B+ is way down at 80V, for some reason the PS seems to be
over-regulating. Can't seem to find any more shorted components. With the
little 4-pin opto-isolater removed from the power supply, the B+ goes back
to normal but the power just cycles on and off. Am I probably looking at a
bad opto-isolater, or is there something else I'm missing?
Anyone have a schematic of the power supply, so I could have something to
go by?
Thanks for any help.

Schematic emailed directly to you.



--
==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)

========================

"Chris F." wrote in message
...
Got this set in a couple of weeks ago, the owners kid had spilled water
down the back and totally fried the power supply. After ordering some
original Sanyo parts and installing them, the set powered for a half
second
and blew the chopper transistor again. Turns out there was a bad zener on
the secondary side. Fortunately I had ordered a spare chopper trans, so
once
everything was patched up again the set powers but shuts down after a
second
or two. The B+ is way down at 80V, for some reason the PS seems to be
over-regulating. Can't seem to find any more shorted components. With the
little 4-pin opto-isolater removed from the power supply, the B+ goes back
to normal but the power just cycles on and off. Am I probably looking at a
bad opto-isolater, or is there something else I'm missing?
Anyone have a schematic of the power supply, so I could have something to
go by?
Thanks for any help.

No electrolytics in the SMPS primary, except for the big B+ rectifier....

"kip" wrote in message
.. .
Chris I would certainly go for the Opto first.
Maybe bad cap in SMPS primary section.
kip
"Chris F." wrote in message
...
Got this set in a couple of weeks ago, the owners kid had spilled water
down the back and totally fried the power supply. After ordering some
original Sanyo parts and installing them, the set powered for a half
second
and blew the chopper transistor again. Turns out there was a bad zener
on
the secondary side. Fortunately I had ordered a spare chopper trans, so
once
everything was patched up again the set powers but shuts down after a
second
or two. The B+ is way down at 80V, for some reason the PS seems to be
over-regulating. Can't seem to find any more shorted components. With
the
little 4-pin opto-isolater removed from the power supply, the B+ goes
back
to normal but the power just cycles on and off. Am I probably looking at
a
bad opto-isolater, or is there something else I'm missing?
Anyone have a schematic of the power supply, so I could have something
to
go by?
Thanks for any help.