All the isolation on the grounds makes these good in operation but it gets tricky testing! Yes it looks like your issue is in the area of Q6. It's base gets a 5V signal from the control board to turn on through R11 which in turn should ground the input of U2.
If you find pin 4 of U2 is actually being grounded but the output fets aren't turning on look for a short between the gate and the source on Q8 and Q9 shorting the output of U2. This happens quite often and is hard to see.
If you find pin 4 of U2 is actually being grounded but the output fets aren't turning on look for a short between the gate and the source on Q8 and Q9 shorting the output of U2. This happens quite often and is hard to see.
Very hard to see, but the base of Q6 isn't attached to it's pad. Resoldered and everything is working perfectly.
1 more question, can I power both DC boards from the rails of one channel, or should I power each board separetely from each channel board?
You have literally spent most of today answering my crazy questions. I can't thank you enough!!! if you need someone to write testimonies or reviews let me know, it's the least I could do.
Yes. It doesn't happen always. My guess is that it detects DC before the SSR so it doesn't do any harm to the speakers 'cause the SSR (on the OPS module) are closed.Is the protection board shutting the amp down when this happens?
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