I don't have a schematic; I've substituted out a few of the larger
capacitors one at a time (assuming a bad power supply capacitor). But I'm
just guessing. Anyone have experience with this model or know of a good
(cheap) source for the schematic? I've done TV repair in the past, just
not recently. Thanks in advance for any assistance..

Don in sunny Florida

A/V input sound ok? Just tuner sound bad?
Look for a bad SBX sound module inside the if tuner can. About a $15
part mail order.
David

Thanks for the tip; I will check it out...
Don in sunny Florida

,

You were right!! Good A/V sound and video quality. Located the SBX can,
but which is the "SBX sound module" itself? Is it the round silver button
cell looking device? Presumably, I will have to de-solder the entire can
in order to remove the module? Do you have a part number for this item?
Questions!! Questions!! Anyway, thanks a lot!

Don in sunny Florida

It's one of the square shaped "boxes" that solder vertically to the
main board near the tuner, usually labled H001. You have to unsolder
all the inline pins that mount it to the board, (about 20-25), then all
4 corners to remove it, then pop off the metal shields and look for the
MTS module. It's a little piece about 1"x1.25" with about 16 leads part
# SBX1637-11. Unsolder the pins (about 16), replace it and you should
have sound again.
Ron