Agilent Technologies E5061B Service Manual page 25

Troubleshooting
No Display Troubleshooting
Step 2. Check system fan inside.
If the system fan on the chassis inside the E5061B don't run, problem seems in the A51
Measurement I/F board or the flat cable between the A51 Measurement I/F board and CPU
module. In this case, remove the E5061B outer cover and make sure whether the fan run or
not.
If a beep and a power shutdown occur immediately after power is turned on, there is a
possibility that the fan won't run. The power shutdown occurs the moment the system fan
stops by any anomaly. In this case, check the fan that doesn't run.
If the power shutdown occurs without a beep, the problem seems in the A51 Measurement
I/F board or the CPU module.
Step 3. Check LED of "Num Lock" key
Press "Num Lock" key on the keyboard. If the LED in the key doesn't light as shown in
Figure 2-6, a problem seems in the CPU module.
Figure 2-6 LED of the Num Lock key
Make sure the following before replacing the CPU module.
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Step 4. Checking with the external monitor
Connect an external VGA monitor to the VIDEO output on the E5061B rear panel.
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Step 5. Checking flat cable
Check a flat cable between the A50/A60 CPU Module and A52 Front Panel I/F board.
Step 6. Check around the backlight
Check inverter board and a cable between the inverter board and A52 Front Panel I/F
board. Also check the cables between the LCD and A52 Front Panel I/F board. If the cables
are normal, check the LCD.
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Whether all the connections to the A50/A60 CPU Module are normal or not. Check if
there is any disconnection or connection working loose.
If something is displayed on the external monitor, the problem is present around the
LCD. Also check the A52 Front Panel I/F board because the ON/OFF setting of the
LCD backlight is controlled by the A52 Front Panel I/F board.
If nothing is displayed even on the external monitor, the problem seems in the CPU
module.
Chapter 2