Fluke 199C broken! Help to repair

[NicolaFabbri]

@squadchannel sorry if I come back... but after some month where oscilloscope was ok, I found that keboard was not responding except switching on-off or doing this and entering in DFU mode. So I decide to reflash firmware, and I come back on first page where oscilloscope ask me the language, but keyboard don't work! Nether I'm able to simulate key via serial line.
But waveform is running!

Strange...
Any idea?  :'(

[squadchannel]

Hmm, the firmware is working, and I don't really have any ideas.

@asis, what do you think?

[asis]

Hi,

First, I would carefully inspect the PCB for the condition of the tantalum ECAPs.
Then, using the scope's schematic, I would measure all supply voltages, paying attention to the presence of pulsation.
Then, I would disconnect the keyboard flex cable and, by trial and error, determine which control commands the KY scope responds to via the OC4USB cable.