Keysight E5052B - No Display Troubleshooting

58 Chapter 4
Troubleshooting
No Display troubleshooting
No Display troubleshooting
If the E5052B displays nothing despite it is powered from proper ac power line, isolate the
failure in accordance with the procedure shown in Figure 4-2.
Connect the keyboard to the E5052B rear panel connector, turn the power on and start
trouble isolation. The methods of trouble isolation are described in the procedural step 1 to
6.
Figure 4-2 No display trouble isolation procedure
e5052bse1002
Replace A20 digital motherboard
Connect external monitor
Check flat cable between A20 digital
mother board A22 front key board
Check LCD backlight
Displayed
on monitor?
Flat cable OK?
No
No
No
LCD backlight ok?
Replace A51 LCD
Replace A52 inverter
Replace flat cable
Yes
Yes
Yes
Replace A21 PCI DSP Card
Check system fan inside
System fan ok?
No
Yes
5
4
3
No Display Trouble
Isolation start
Check rear panel fan and
dc monitor LEDs on A21
Fan ok
and LEDs light?
Yes
1
2
No
Yes
A51 outputs ok?
No
Replace power supply
Yes
A22 outputs ok?
No
Replace A22 power dist.