IBM 390, 387, 393, 391, 389, 388, 441, 392 manual System board LEDs, System board hardware fault LED

System board LEDs

This topic helps you locate the LEDs on the system board.

The following illustration shows the BMC status LED, system board hardware fault LED, and the POST code diagnostic LEDs on the system board.

Figure 30. System board LEDs

	System board hardware fault LED		POST code diagnostic LED #1
1		6
	BMC status LED		POST code diagnostic LED #6
2		7
	POST code diagnostic LED #4		POST code diagnostic LED #2
3		8
	POST code diagnostic LED #0 - Least Significant		POST code diagnostic LED #7 - Most Significant Bit (MSB)
4		9
Bit	(LSB)
	POST code diagnostic LED #5		POST code diagnostic LED #3
5		10

1

System board hardware fault LED

When this LED is lit, it indicates that the system board hardware has failed.

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