I have a Pioneer VSX-D503 surround receiver. It has a scratchy sound coming from the LH speaker only. The problem is in the power stage because it is unaffected by the vol control. Sounds exactly like a noisy transistor in the output stage, but I have no schematic & can't narrow it down any further. Can you help?
If the speaker is not blown, there must be an output capacitor. If no output capacitor, and you have a blown transistor the speaker will blow from DC current. You can further check the transistors with a multimeter. A transistor looks like 2 diodes and you should be abobe to test with a mulimenter like a diode test.
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