FRU replacement notices
This section contains notices for removal and replacement.
Read this section carefully before replacing any FRU.
LCD replacement notice
The TFT LCD for the computer contains many thin-film
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:
v XGA : 8 or more bright dots, 8 or more dark dots, or a
total of 9 or more bright and dark dots.
Screw notices
This computer uses special nylon-coated screws with the
following characteristics:
v They maintain tight connections.
v They do not easily come loose, even with shock or
vibration.
v They need additional force to tighten.
v They should be used only once.
Do the following when you service this machine:
v Keep the screw kit (P/N 08K6560) in your tool bag.
v Always use new screws if you are instructed.
v Use a torque screwdriver if you have one.
Loose screws can cause a reliability problem. The IBM
ThinkPad computer addresses this problem with
nylon-coated screws. Tighten screws as follows:
v Plastic to plastic
Turn an additional 90 degrees after the screw head
touches the surface of the plastic part:
v Logic card to plastic
22 ThinkPad R30/R31 HMM
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