Hello all,
I finished to assembling two PCB rev 1.7.
Everything was fine until I connected the input: I heard a loud "poc" on one of my speakers. After inspection, I forgot to connect the PGND on one PCB . This is what happens when you work late at night on your DIY projects!
Since then, the relay no longer activates on the PCB where the connection has been forgotten and the LM3886 is now hot.
I checked the voltages indicated on the PCB and found nothing wrong.
I have already replaced LM318, D1, D2, D2, D3 and LM3886 without success. I measure a DC voltage of -34V on the LM3886 output.
Do you have any suggestions for troubleshooting?
The positive side is that the second PCB is functional...
Thank you for your help!