Lenovo ThinkPad 390X Hardware Maintenance Manual (November 1999): ThinkPad 390 - Page 65

FRU Service Procedures, LCD FRU Replacement Notice, Replacing the System Board, Screw Notices

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FRU Service Procedures Review the following procedures before replacing any FRU. 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 (15.1"/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 390X / i Series 1700 CE Utility Diskette. See "Writing the RFID Data" on page 47 and "Flash UUID" on page 47 respectively. Note: Do not power off the computer while restoring the RFID. Screw Notices: Loose screws can cause a reliability problem. The IBM ThinkPad computer addresses this problem with nylon-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 plastic part: ThinkPad 390X / i 1700 HMM 59

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FRU Service Procedures
Review the following procedures before replacing any
FRU.
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 (15.1"/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 390X / i Series
1700 CE Utility Diskette. See “Writing the RFID Data” on
page
47 and “Flash UUID” on page
47 respectively.
Note:
Do not power off the computer while restoring the
RFID.
Screw Notices:
Loose screws can cause a reliability
problem. The IBM ThinkPad computer addresses this
problem with nylon-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 plastic part:
ThinkPad 390X / i 1700 HMM
59