how to remove a glaze... and find equivalent

Thread Starter

punkieys17

Joined Oct 4, 2014
17
I have an old Karcher pressure washer that leaked and blew a power semiconductor. Rather than guess I simply bought a new board in the hope I could read the identification markings. Unfortunately the board is covered in a clear glaze which is obscuring the markings. Any idea how one can remove the glaze but leave the markings? I've attached a picture of the semi - its used to drive a relay - its beside the 10K SMD resistor and the tiny 220pf capacitor20220612_110904.jpg
 
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peterdeco

Joined Oct 8, 2019
484
That glaze is known as a conformal coating to prevent corrosion from moisture. One way that is used to remove it is with solvent but I suspect solvent might remove the part number. Another is to use a heat gun to soften it to the point you can carefully scrape it off.
 

Thread Starter

punkieys17

Joined Oct 4, 2014
17
Looks like a to 223 cased mosfet with markings P1M G F038. It's used to control a relay on a karcher steam washer. Searching the web I can find people claiming they have stocks but no data or equivalents
 

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