FRU REPLACEMENT NOTICES
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 over 2,359,296
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 8 or more.
Screw notices
Loose screws can cause a reliability problem. The an IBM
ThinkPad computer addresse this problem with special
nylon-coated screws that have the following characteristics:
They maintain tight connections.
They do not easily come loose, even with shock or
vibration.
They need additional force to tighten.
They should be used only once.
Do the following when you service this machine:
Keep the screw kit (P/N 05K4841) in your tool bag.
Always use new screws if you are instructed.
Use a torque screwdriver if you have one.
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:
34 ThinkPad 600X Hardware Maintenence Manual
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