IBM 380Z manual Peripheral-Device-Related Symptoms, Power-Related Symptoms

Symptom /		Error				FRU /		Action in		Sequence
No beep, power-on						indicator1. Reseat			the	CPU	card.
on,	and	a	blank		LCD	during	2.	DC/DC card
POST.							3.	System board
1.	LCD	backlight			not		1. Reseat		the	LCD
	working.						connectors.
2.	LCD	too	dark.				2. LCD		inverter		card
3.	LCD	brightness				cannot	3.	LCD assembly
	be	adjusted.					4.	System board
4.	LCD	contrast			cannot
	be	adjusted.
1.	The	LCD	screen			is	1. See	important		note
	unreadable.						for	“LCD-Related
2.	Some	pels		missing in			Symptoms.”
	characters.						2. Reseat			all	LCD
3.	The	screen			is		connectors.
	abnormal.						3.	LCD assembly
4.	Wrong color displayed. 4.							System board
LCD	has	extra		horizontal LCDor assembly
vertical		lines		displayed.

Peripheral-Device-Related Symptoms

Symptom /		Error	FRU	/	Action in Sequence
The	external monitor		doesConnect		the	external
not	work	correctly.	monitor		to	another		PC.	If
			the	monitor		works		fine,
			replace		the	system		board.
			If	not, replace			the	external
			monitor .
Printer		problems.	1. Run		printer self-test .
			2. Parallel				port		wrap	test.
				3.	System board
				4.	Printer cable
			(See		the		printer manual			for
			the		above		tests.)
Serial or parallel port device1.Run serial or parallel
problems.				port		wrap	test. (See
				the		device			manual	for
				the		test.)
				2.	Device
				3.	System board
				4.	Device cable

Power-Related Symptoms

ThinkPad 380Z 31