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In Reply to: RE: Class D mini amps posted by Hornlover on November 20, 2018 at 08:05:52:
I had already replaced the chip once. It was harder than changing a light bulb, but not bad. The original amp was cheap and the implementation was marginal, but it still sounded okay, especially in the kitchen. It would never have made it in the main system.
During the first repair, I damaged a few pads while desoldering the old chip. This is easy to do, even if you're careful and experienced, on cheaply made PCB's. The repaired amp worked for a few years, but recently began cutting out intermittently. No noise, no distortion, just silent in one channel. That's probably not a PS problem, so that leaves only a few 'lytic caps, a couple opamps, and the LM3886. All caps checked out okay, replaced two crappy opamps with better ones, still not working. I had a spare LM3886 laying around, so I wanted to try that. While desoldering this time, I completely destroyed a couple more pads, plus discovered that what I had done to them during the first repair was probably the cause of recent intermittent operation. I've patched bad pads before, but due to the tight spacing and my growing frustration, I decided against all that effort and junked it. I got my money's worth out of it. Salvaged the xformer and the aluminum case and heatsink.
Peace,
Tom E
berate is 8 and benign is 9
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- sad story - madisonears 11/20/1813:07:05 11/20/18 (0)
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