Samsung 943NWX service manual When the Power Does Not Turn On

4. Troubleshooting

4-2. When the Power Does Not Turn On

Symptom	- When turning on the Power button after connecting the power cable, the LED at the front of the
		monitor does not operate.
	- When turning on the Power button after connecting the power cable, the LED at the front of the
		monitor does not operate.
Major checkpoints	- Check the IP board power fuse and the IP board output power.
	- Check the connections for the IP board and the Main board inside the monitor.
	- Check the Main board power part and also check whether there is any abnormal output at any of
	the other output terminals.
		CN 600
				IC 601
			IC 602

			Yes
				Check the connection status for
				the function assy.
	Is DC 5V measured at pins 5, 6 of the		No
	CN600 connector when pins 3, 4 are			Replace the IP board.
	0V?
		Yes
	IIs DC 3.3V measured at pin 3 of IC601		No	Check the circuits related to
Diagnostics				IC601.
	when pin 1 is DC 5V?
		Yes
	Is DC 1.8V measured at pin 2 of IC602		No	Check the circuits related to
				IC602.
	when pin 3 is DC 5V?
		Yes
	Check and replace the IP board.

Caution

Make sure to disconnect the power before working on the IP board.

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