Removal (difficult) of PCB from heatsink?? - diyAudio
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Old 2nd January 2013, 11:18 PM   #1
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Question 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
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Old 2nd January 2013, 11:47 PM   #2
eyoung is offline eyoung  United States
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Hi ...

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

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Old 2nd January 2013, 11:49 PM   #3
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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.
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Old 3rd January 2013, 12:18 AM   #4
djQUAN is offline djQUAN  Philippines
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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.
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Old 3rd January 2013, 01:19 AM   #5
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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...
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Old 3rd January 2013, 02:20 AM   #6
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Default ...responce to "eyoung's" photo request...

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 > In the attchd photo you can see what is believed? to be silpad material between the transistors and the heat sinks.
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Old 3rd January 2013, 02:53 AM   #7
DUG is offline DUG  Canada
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My personal favorite.

But there are many, many others.
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