NEC AccuSync LCD72VM User Manual page 114

5. PWPC
5.1 No Power
Check to CN102 PIN 12=12V
Check AC line volt 110V or 220V
Check the voltage of C905(+)
Check start voltage for the PIN 3 of IC901
Check the auxiliary voltage Is between 10V-16V
Check D910, D911, ZD904
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
Check Interface Board
Check AC line
Check F901, bridge rectified circuit
Check R906, R907, IC901
1) Check IC901,
2) Check Q901, Q902 OVP circuit
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