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