Undetermined Problems - Lenovo AIO V540-24IWL Hardware Maintenance Manual

Message/Symptom
RPL computer does not RPL from server
Serial or parallel connector device failure (system board
connector)
Serial or parallel connector device failure (adapter
connector)
Some or all keys on the keyboard do not work

Undetermined problems

This section provides instructions on how to find out the failing devices or adapters.
1. Turn off the computer.
2. Remove or disconnect the following components (if installed) one at a time.
a. External devices (modem, printer, or mouse)
b. Any adapters
c. Memory modules
d. Extended video memory
e. External Cache
f. External Cache RAM
g. Hard disk drive
h. Diskette drive
3. Turn on the computer to retest the system.
4. Repeat steps 1 through 3 until you find the failing device or adapter.
If all devices and adapters have been removed, and the problem continues, replace the system board. See
"System board" on page 82.
FRU/Action
1. Check the startup sequence.
2. Check the network adapter LED status.
1. External Device Self-Test OK?
2. External Device
3. Cable
4. System Board
1. External Device Self-Test OK?
2. External Device
3. Cable
4. Alternate Adapter
5. System Board
1. Keyboard
2. Keyboard Cable
3. System Board
.
Chapter 4 Service checkout and symptom-to-FRU index
37