Lenovo 3823, 3821, 3822, 3719 manual Diagnostics

vFollow the suggested actions in the order in which they are listed in the Action column until the problem is solved.

vSee Chapter 8, “Parts Listing, TD200x Machine Types 3719, 3821, 3822, and 3823,” on page 237 to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU).

vIf an action step is preceded by “(Trained service technician only),” that step must be performed only by a trained service technician.

Symptom	Action
The monitor has screen jitter, or	1.	If the monitor self-tests show that the monitor is working correctly, consider the
the screen image is wavy,		location of the monitor. Magnetic fields around other devices (such as
unreadable, rolling, or distorted.
		transformers, appliances, fluorescent lights, and other monitors) can cause
		screen jitter or wavy, unreadable, rolling, or distorted screen images. If this
		happens, turn off the monitor.
		Attention: Moving a color monitor while it is turned on might cause screen
		discoloration.
		Move the device and the monitor at least 305 mm (12 in.) apart, and turn on
		the monitor.
		Notes:
		a. To prevent diskette drive read/write errors, make sure that the distance
			between the monitor and any external diskette drive is at least 76 mm (3
			in.).
		b. Non-Lenovo monitor cables might cause unpredictable problems.
	2.	Reseat the monitor.
	3. Replace the following components one at a time, in the order shown, restarting
		the server each time:
		a.	Monitor
		b. (Trained service technician only) System board
Wrong characters appear on the	1.	If the wrong language is displayed, update the server firmware with the correct
screen.		language (see “Updating the firmware” on page 267).
	2.	Reseat the monitor
	3. Replace the following components one at a time, in the order shown, restarting
		the server each time:
		a.	Monitor
		b. (Trained service technician only) System board

Chapter 5. Diagnostics 71