Anyone familiar with troubleshooting a Lecroy/Siglent
scope?
I have this Waveace 224 with Siglent SAT7.820.682F main board.
The oscilloscope seems to boot, I can hear some relays clicking, face LEDs goes on and off and display stay blank.
Buttons are not responding.
I have checked all rails coming from power supply, everything is fine.
Checked the regulators on main board as per the Siglent SDS1000CFL user manual, all voltage are good.
I also have the 25 MHz main clock OK.
I checked with another scope the activity on the display ribbon cable, it seems to have some activity at 10 kHz and 8 MHz.
There is also activity on the button board ribbon. When I press a button I can see the pattern on my other scope.
Don't know where to look then?


