Others Operational Error; Ddc Read Error; Back Light Malfunction - NEC MultiSync LCD1920NX User And Service Manual

4. Others operational error

4.1 DDC read error

1) D-SUB
• Check the power supply for IC26.
• Check the clock signal waveform at Pin 6 of IC26 and the data waveform at Pin 5.
2) DVI
• Check the power supply for IC14(24C02).
• Check the clock signal waveform at IC14 Pin 6 and the data waveform at Pin 5.

4.2 Back light malfunction

• Check for loose cabbles, if any.
• Is 12V available at W05 Pins1, 2, 3?
• Is W05 Pin 8 maintained at 4.5V or above, and Pin7 at 0~5V ? If there is still no lighting even though the
above-mentioned voltages are maintained, then the inverter PCB is considered to be out of order.
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