Lenovo ThinkPad 390E Hardware Maintenance Manual (March 1999): ThinkPad 390E o - Page 71

FRU Service Procedures, the Flash UUID Utility in the ThinkPad 390E CE Utility

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LCD FRU Replacement Notice: The TFT LCD for the notebook computer contains over 2,359,296 thinfilm transistors (TFTs). A small number of missing, discolored, or lighted dots (on all the time) is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns. The LCD should be replaced if the number of missing, discolored, or lighted dots in any background is: SVGA (12.1"): 5 or more bright dots, 5 or more dark dots, or a total of 9 or more bright and dark dots XGA (13.3"/14.1"): 8 or more bright dots, 8 or more dark dots, or a total of 9 or more bright and dark dots Replacing the system Board: When you replace the system board, restore the system unit serial number using the RFID Utility and reassign the UUID using the Flash UUID Utility in the ThinkPad 390E CE Utility Diskette. See "Writing the RFID Data" on page 49 and "Flash UUID" on page 49 respectively. Note: Do not power off the computer while restoring the RFID. Screw Notices: When you service this machine, do the following, Keep the screw kit (P/N 12J0808) in your tool bag. Always use new screws. Plastic-coated screws cannot be reused. Use a torque screwdriver if possible. Screw Tightening Information p.Loose screws can cause a reliability problem. The IBM ThinkPad compute addresses this problem with plastic-coated screws. Tighten screws as follows, Plastic to plastic Turn an additional 90 degrees after the screw head touches the surface of the plastic part. Logic card to plastic Turn an additional 180 degrees after the screw head touches the surface of the logic card. Torque driver If you have a torque driver, refer to the torque instructions with each step. ThinkPad 390E 61

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LCD FRU Replacement Notice:
The TFT LCD
for the notebook computer contains over 2,359,296 thin-
film transistors (TFTs). A small number of missing, discol-
ored, or lighted dots (on all the time) is characteristic of
TFT LCD technology, but excessive pixel problems can
cause viewing concerns. The LCD should be replaced if
the number of missing, discolored, or lighted dots in any
background is:
±
SVGA (12.1"): 5 or more bright dots, 5 or more dark
dots, or a total of 9 or more bright and dark dots
±
XGA (13.3"/14.1"): 8 or more bright dots, 8 or more
dark dots, or a total of 9 or more bright and dark dots
Replacing the system Board:
When you
replace the system board, restore the system unit serial
number using the RFID Utility and reassign the UUID using
the Flash UUID Utility in the ThinkPad 390E CE Utility
Diskette. See “Writing the RFID Data” on page
49 and
“Flash UUID” on page
49 respectively.
Note:
Do not power off the computer while restoring the
RFID.
Screw Notices:
When you service this machine, do
the following,
±
Keep the screw kit (P/N 12J0808) in your tool bag.
±
Always use new screws. Plastic-coated screws
cannot be reused.
±
Use a torque screwdriver if possible.
Screw Tightening Information
p.Loose screws
can cause a reliability problem. The IBM ThinkPad
compute addresses this problem with plastic-coated
screws. Tighten screws as follows,
Plastic to plastic
Turn an additional
90 degrees
after
the screw head
touches the
surface of the
plastic part.
Logic card to plastic
Turn an additional
180 degrees
after
the screw head
touches the
surface of the logic
card.
Torque driver
If you have a
torque driver, refer
to the torque
instructions with
each step.
ThinkPad 390E
61