This was working fine until recently. First clue something was wrong was the capacitance function no longer worked, but it still seemed to trigger normally, at least on the 120V signals most recently viewed on channel A. It was put away for a bit, but now will not trigger on A or B at all despite seeing free running waveforms on the screen.
Per the service manual, I checked TP156 and TP256 (from the trigger ASIC). Neither shows the sine output expected for channels A or B under test conditions. The SM says this indicates that the trigger ASIC is bad. I can't imagine what could have taken both channel trigger ASICs out.
The capacitance function uses the trigger ASIC so no surprise it is non-functional.
So, any ideas? If the ASICS are bad, I'm sure Fluke repair will be more costly than makes sense to spend on the thing. [emoji45]