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Highcurrent 2nd January 2013 11:18 PM

Removal (difficult) of PCB from heatsink??
Hello, I have a question about technique. I'm attempting to remove an output pcb from a heatsink. The pcb is mounted via 10 mofset transitors w/ screws onto the board. In between the transitors and the heatsink is a tan colored sheet of vinyl. How does one delicately remove the board from from the heatsink without trashing anything?? It seems as though the manufacturer has glued them together?! Thanks

eyoung 2nd January 2013 11:47 PM

Hi ...

What kind of amp is it??? pictures please.

Regards, Elwood

nigelwright7557 2nd January 2013 11:49 PM

Its probably silicon grease for heat transfer, not glue.

De-solder one transistor at a time. Suck off the solder then ease out the transistor.

djQUAN 3rd January 2013 12:18 AM

Those 'tan colored vinyl' things are called silpads. They are not glued together. Just stuck tightly due to the silpads. Just pry them off gently using a razor blade between the transistor and heatsink. You will need a new set of silpads after that.

Highcurrent 3rd January 2013 01:19 AM

Excellent! I suspected it would involve some delicate prying action to one extent or another! Silpads huh? Probably available from the usual suspects I would imagine...

Highcurrent 3rd January 2013 02:20 AM

...responce to "eyoung's" photo request...
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The amp involved is a B&K 7250 II bought locally for a couple of hundo's from a guy who said it had a blown out channel. It merely had a noisy, sizzling .12uf cap which I've since removed. I've got dozens of new elnas ready to populate the boards :D> In the attchd photo you can see what is believed? to be silpad material between the transistors and the heat sinks.

DUG 3rd January 2013 02:53 AM

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My personal favorite.

But there are many, many others.

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