Post several pictures of amp, one overall and one with and w/o preamp board.
Is there any current draw when the amp attempts to power up?
Check the outputs with an ohmmeter if you haven't already. If the outputs check okay, remove main board and inspect solder around outputs, header for preamp.
The +/- 12 volt near the preamp board generates a lot of heat, check around this circuit for shorted zeners,transistors,caps and check solder.
Is there any current draw when the amp attempts to power up?
Check the outputs with an ohmmeter if you haven't already. If the outputs check okay, remove main board and inspect solder around outputs, header for preamp.
The +/- 12 volt near the preamp board generates a lot of heat, check around this circuit for shorted zeners,transistors,caps and check solder.
Just finished the output section. Audio on every channel. I replaced u3-u4-u13. U purchased enough to do them all. The transistors q22-23 bd139-bd140. All four pnp transistors on the underside. So it's now working. One thing it didn't shut off when I removed the remote voltage?
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