MD-HMI LCD problems

[tkidder2]

I have a T100MD888+ and the MD-HMI. The LCD will
go blank randomly. It can only be reset by cycling the power. I have seen other messages with the same problem. I tried all the suggested fixes, Shorter cables,
shielding etc. without much result. I read something about a booster board, would that help? I need to make the unit completely reliable if possible.

                                       Thanks

[support]

The booster board boost the signal for the expansion port but not the LCD port. It was used mainly for interfacing the HMI to older generation of T100MD+ PLC and may not be helpful in this case.

You do need to tackle the origins of the noise source. It is likely to be caused by noise from inductive kicks. Try to add diodes or transorb to your output if you are driving inductive loads such as solenoid, contactor or motors. Also make sure that the LCD cable is not "bundled" with any 24V or 120V in the conduit as the 5V signal to the LCD can be affected by high current in such wires.