Muratec MFX-C4000 Field Engineering Manual page 199

2) No Display on LCD
Description : Engine is warming up properly but LCD displays nothing.
Check the flow chart
Check +24V
On OP PBA
Check Connecting
Harness between
OP & MAIN PBA
N.G
Connect the harness
correctly
Service Manual
Alignment & Troubleshooting
O.K
N.G
O.K
Check
the BLU Harness
on OP PBA
Check +5V
On MAIN PBA
N.G
4-93
O.K
Replace
OP PBA or LCD
O.K
Replace
OP PBA
Replace
MAIN PBA