I bought MLS 4000 machine with tig functions (MTM control panel). Problem is that it won´t do anything. Deal was without any guarantee which was stupid idea at afterwards but accident is happened. I have tried put power on but control panel do not wake up. There is shown anything in control panel. I have no cables connected but I think it won´t make any difference. I investigate problem a little. Main switch works voltage comes same PCB than control panel is connected with cable. Voltage that comes to PCB was close to 200 volts and dc. There is some big component after voltage input on PCB but I can not measure voltage after that because lines are different side of PCB. There is also one varistor in PCB which is black so it is broken. Still there is no coming voltage to varistor at all so it is not only problem. Have anybody to schematic or even good ideas to solution?