Shanling PH100 - Non-volume/input dependant hiss through one channel
As title really.
I noticed a hiss coming through the left channel of my PH100 a couple of nights back. It fluctuates/crackles, but is never very loud, i.e. music easily drowns it out. It sounds very much like the run-in groove on a record (less HF crackle though). I'm concerned that this could ultimately ruin my HD 650s or Denon D2000s.
All I've tried/found so far:
If diagnosis is possible from the above info, what's the likely cause? I can solder etc, so fixing it's not a problem. Finding the problem might be a bit harder (unless I find scorched components/bursting caps etc).
Just had the lid off, and nothing looks untoward inside.
That sounds like a defective/damaged component, most likely a transistor or FET. Even bad film caps, as rarely as they occur, can cause things like that, as well as bad bias diodes (another rare occurrence). It might also be a bad solder joint.
Diagnosing problems like that generally isn't easy. One can poke around in the circuit with a scope in the hope of finding something. Having a general idea of how the circuit works definitely doesn't hurt, so if there isn't a schematic to be found anywhere, one should make a list of semiconductors at least (one channel, from volume pot to output FETs).
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