I have a Topping A30 Pro headphone amp that suddenly died with a loud pop while listening. Since then one or more relais are constantly clicking, when turning the unit on. There appears to be 7 Omron relais on this board.
So I believe the protection circuit is doing it's job and it's constantly triggering. I tried with a different power cable, to rule that out.
I hoped it might just be the power supply modules, so I ordered new Meanwell IRM-20-24 and soldered them in - without a change, still clicking.
How would I start debugging the issue? I have a UT139E multimeter with regular probes, they might be a bit large for live testing in fear of shorting, though. Can I passively find the issue?
My hypothesis with the constant clicking is that something with the power delivery has to be broken?
So I believe the protection circuit is doing it's job and it's constantly triggering. I tried with a different power cable, to rule that out.
I hoped it might just be the power supply modules, so I ordered new Meanwell IRM-20-24 and soldered them in - without a change, still clicking.
How would I start debugging the issue? I have a UT139E multimeter with regular probes, they might be a bit large for live testing in fear of shorting, though. Can I passively find the issue?
My hypothesis with the constant clicking is that something with the power delivery has to be broken?
If the protection relay is clicking, it means something is forcing it to trigger. You can check the relay with a multimeter: https://electronicshub.org/how-to-test-a-relay-with-a-multimeter/
