SparkyGuy wrote in message
obal.net...
Fixed a 26" Gateway LCD TV/monitor (bad solder joint in the SMPS).

But exposing the component side of the power supply requires pulling off 2
heat sinks that are glued to the tops of the 2 transformers. Some of the
glue
pulled off of the top of one transformer (about 3/16 inch, or 5mm thick)
and
a copper strap that winds around the laminates came loose.

Is this really a heat conductor? Seems to be not possible, but then I'm no
glue chemist.

Should the missing glue be replaced? What should I use?

Is it important to relocate the end of the copper strap?

Regarding the other transformer (the glue is intact), should anything be
placed between the glue and the heat sink (ie, heat sink compound), or
just
clamp down the heat sink?

The "glue" is white and seems to be the same stuff used to attach some of
the
components to the PCB. It is a bit flexible but not very; it crumbles when
scraped off or when a sliver of it is bent. Not epoxy, no way.

Here's the top of the transformer:

http://www.uploadwiz.com/WIZ2755487483

Here's what's left of the material, stuck to the heat sink:

http://www.uploadwiz.com/WIZ3413654658

Thanks,
Sparky


My error, I have to copy and paste into browser from newsreader and not full
URL copied across.
I've often seen that gel type stuff, I assumed it was a silicone like RTV
and assumed it was for acoustic damping of any proneness to sing.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/