Hi guys, I've got two faulty amplifier boards of powered speakers. I was informed that there was a mains overvoltage (measured 300V between L and N yikes!) situation that the speakers were exposed to. The speakers weren't being used at the time but was on at the time.
The power supply FETS were blown along with the gate diodes and the resistors. Luckily had spares for those.
Before powering up, I had a look for other faulty components and found that two MOSFETS for the amplifier were also shorted out on one channel that is. I am not super familiar with working on Class D amps and was hoping to get more ideas on what to looks for before just changing the FETS. I probed around components near the fets and didn't find anything which were faulty. The control IC is IRS2092. I have included a photo of the good side for reference. How could I check the IC whether the IC is faulty or not. I haven't got access to an oscilloscope at the moment
Lastly I understand that its not a good idea to power up Class D amps without a load attached which may cause ringing otherwise. Was wondering whether it would be okay to power up the amp to check whether it powers up and not apply any input signal.
Thanks in advance