Lenovo 3724, 3836, 3809, 3826, 3824, 3808, 3815, 3817 manual Troubleshooting

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

vSee the Hardware Maintenance Manual to determine which components are customer replaceable units (CRUs) and which components are field replaceable units (FRUs).

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 screen is blank.	1.	Make sure that:
		v The server is turned on. If there is no power to the server, see “Power
		problems” on page 171.
		v The monitor cables are connected correctly.
		v The monitor is turned on and the brightness and contrast controls are
		adjusted correctly.
		Important: In some memory configurations, the 3-3-3 beep code might sound
		during POST, followed by a blank monitor screen. If this occurs and the Boot
		Fail Count option in the Start Options of the Setup Utility program is enabled,
		you must restart the server three times to reset the configuration settings to the
		default configuration (the memory connector or bank of connectors enabled).
	2. Make sure that the correct server is controlling the monitor, if applicable.
	3. Make sure that damaged server firmware is not affecting the video; see
		“Updating the firmware” on page 151.
	4. See “Solving undetermined problems” on page 173.
The monitor works when you	1.	Make sure that:
turn on the server, but the
		v The application program is not setting a display mode that is higher than the
screen goes blank when you
		capability of the monitor.
start some application
		v You installed the necessary device drivers for the application.
programs.
	2.	Run video diagnostics.
		v If the server passes the video diagnostics, the video is good; see
		“Troubleshooting tables” on page 163.
		v (Trained service technician only) If the server fails the video diagnostics,
		replace the system board.
The monitor has screen jitter, or	1.	If the monitor self-tests show 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 following components:

a.Monitor cable

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 7. Troubleshooting 169