Hello
I have a Sonos AMP. C17 had a short circuit. Unfortunately, this also burned out the L2 coil (470 µH). Apparently, the circuit path on the multilayer board is also broken, and I believe the path from the L2 coil to resistor R1263 is also broken. Can anyone confirm that the path goes there? R1263 (1 kΩ) has approximately 300V there.
Unfortunately, my AMP isn't working yet because I don't fully understand what SONOS has put together. It contains several PWM chips.
Regards
Stephan
I’m suspicious about D5 and D6. I suggest that you search for DIY repairers. They don’t typically hang out here.
Any updates? Why would you think that the path from the coil goes to the R1263?
I have the exact same problem. I can see bubbles along the trace from l2 to r1263 on the underside of the pcb. So I also connected them via a wire. When I now plug the board in, my light bulb from my short circuit protection circuit lights up. I removed one mosfet from underneath the heatsink as it seemed a little black. Still short circuit when trying to power it on. Will try to remove them both next. Mosfet reads about 500 in diode mode with no shorts. Could it be that it needs both mosfets to get rid of the “short circuit”?
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