BenQ GL2040 - No Power; Troubleshooting

77
No Power
OK
NG
No power
Check power cable is
tightened?
Check Power “On/Off”
is “On”?
Re-plug the power cable
Replace main board and check connections
Check the LED
indicates is OK?
Check the AC power
Replace the converter board
OK
NG
OK
NG
NG
Turn on the Power “On/Off” switch
Replace key board and check connections
NG