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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
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