On Mon, 08 Aug 2005 16:46:12 -0400, Darmok
put finger to keyboard and composed:


Some time ago, I mentioned that my 15 year old Sony KV-27EXR15 would
periodically turn itself off. After some time, it would come back on,
either by itself, or if I turned the set off from the front panel and
let it sit for a while.

snip

On the "G" board, which is located on the left side of the chassis
(looking into it from behind), there is a small, cubical black part in
the lower left corner, with the following printed on it:

081-22
0607
TDK

Looking at the schematic for the KV-27EXR15, I find that this is a
part called "THP607", a 3 legged part. This part gets VERY HOT when
the set is on. When the set goes out, it cools off, and the set will
power up again. I'm thinking that this is some kind of thermal
protection device.

It's a PTC (positive temperature coefficient) resistor. It normally
runs hot. When it does fail it takes out the main fuse. It is not the
cause of your problems. It is used to provide a short pulse of current
to the degaussing coil at switch-on.


- Franc Zabkar
--
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