JL amplifiers are very sensitive to dips in voltage. Dips so short that they can't be seen with the average multimeter will cause a JL amp to shut down.
If all of the LEDs are lit on the driver board, I'd suspect leaky output transistors. Pull the outputs for that channel and check them for leakage. The gate must have infinite resistance to the other two legs and the drain/source legs should show continuity in only one direction with the gate leg shorted to the source leg.
If all of the LEDs are lit on the driver board, I'd suspect leaky output transistors. Pull the outputs for that channel and check them for leakage. The gate must have infinite resistance to the other two legs and the drain/source legs should show continuity in only one direction with the gate leg shorted to the source leg.
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