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Mashall MG15CDR just went up in smoke!

Started by charliefarley96, June 02, 2010, 07:41:22 AM

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phatt

#15
July 08, 2010, 09:32:04 AM
Quote from: balaboo on July 06, 2010, 09:50:29 AM
No need to worry - the chip IS bolted directly to the heatsink, which is left UNCONNECTED to any wiring traces on the pcb. I just use regular white lithium grease - works great.

Have you verifyed that the Hsink is indeed *ground isolated* with a Continuity test?
Phil.

balaboo

#16
July 08, 2010, 10:09:50 AM
Yes, and you can flip the PCB and verify that the heatsink solder pads don't connect to anything - check for swarf, etc.

phatt

#17
July 08, 2010, 09:28:06 PM
No that is *only a visual inspection* :trouble
You need a DMM on the Hsink and the other end to CT of PSU
Phil.
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