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TDA7294? I think I can salvage that from a blown Al621. The PCB was damaged from an earlier modding project with tracing coming off all over but the chips are still working. Will give it a try.

Yup, that's what I thought too. I suppose I could get these chips from my local electronics supply street. :( It's too bad this happen because after all the mods I have done, the sound was really, really good with a wide staging and depth. Anyway, thanks cranky for helping to troubleshoot.

cranky, I did try put back the original caps. Same result...short buzz and silent on the subwoofer. I did try to get the readings as you suggested. The readings were the same (silly me, I forgot to note down the readings) for the relevant pins. Touching the input pin (3) didn't have any sound...

@blr_p I don't think the mods suggested here will messed up the speakers if that is what you are hinting at. I did the mods more than 4 months ago and the speakers were working great. It was only recently that I did another mod that the speakers have some problems. It could be my fault or it...

Hello all, I was reading sergey's post and cranky's response with great interest. I was hoping to find something to my problem as well. I did everything according to all the mod suggested here. Everything was ok and that was 4 months ago. Last night I thought I upgrade the power supply...