DId I fry my PIC?

Testing/Troubleshooting
1

I may have made a booboo with my mbfm. :-[

I recently posted about a garbled sound coming out of my opl3 audio out. Well I messed up. I remember wiring my 12v power supply wrong while the core board connected to opl3 5v were also connected to the same power strip as the 12v supply. So when I turned on the power strip my midibox came on and then shut off very quick because the power strip’s fuse blew. So I tested my core and it still uploads programs but after that I haven’t got the opl3 audio to come out. Should I end up replacing the ymf262 ,yac512s and tl074s? How can I check these parts properly? Would the mbfm interconnections test be able to verify this?

Regards,

echo

2

The interconnection test will tell you if the relevant parts of the core/pic still work. It will however not tell you anything about the opl/yac/opamps. Although opamps are pretty forgiving the seem to dislike reversed polarity :wink: I’d replace the opamps first, if that doesn’t help you possibly fried the yac/opl.

3

thanks for the input. I had a feeling it would come down to replacing something. Will post results.