Konica Bizhub c250 Screen Problem

[martin_dalton]

Hi

I dont Know if anyone has come across this problem and could help me, but im having a problem with the back light on a c250 control panel.

I can still see the screen and all the buttons but i have now back light, i have done the usual "trouble reset" but that hasnt helped. Below is a number of boards i have also replaced

-complete new control panel
-new pcb-sif board
-swopped a power board with another machine
-swopped a pcb-c image processing board with another machine
-done a firmware upgrade - but not nvram recovery

The only board i havent replaced is the main board, which im abit reluctant to do just yet. Has anyone had this problem with this machine? as im slowly pulling all my hair out.

I probably know what the answer will be "replace the mfp board" but i was just hoping someone has had the problem and could give me a solution without doing the mfp board

regards
tom

[RRodgers]

Maybe bad inverter on the back light.

[martin_dalton]

it has already had a new control panel which worked on another machine