NEC MultiSync FP1350 - 15 Plug & Play Failure; DDC 1 Failure; DDC 2 B Failure

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15. PLUG & PLAY FAILURE
15-1. DDC 1 failure
Retry Check the DDC Function alter Power OFF/ON.
Check the Write Protect function Check the voltage of IC8A1 pin 3. It should be approx. 0 (V)
NG
41±1Hz
Your PC system may have failed
others
OK CPU (IC801) failure
Check the V Sync Check the IC8A1 pin 7
OK
IC8A1 may have failed
NG
Q8A1, Q8A2, Q8A3 may have failed
15-2. DDC 2B failure
Check the DDC 1
NG
Check the DDC 1 failure
OK
Mini D-sub 12, 15 pin, Signal cable, ZD8A1, ZD8A2 may have failed.
Check the vertical frequency
OK
NG
OK