IBM ThinkPad 240X, Hardware Maintenance Manual, Page: 25 / 84

General Description
There are two models of LCD panel used with the
ThinkPad 240X: LCD Type A and LCD Type B. Check the
last five letters of the unit's serial number you are servicing
to determine the model.
LCD Type A:
All ThinkPad 240X computers that have serial numbers
whose last five
alphanumeric characters are "B0586" to
"YZZZZ" are fitted with Type A panels.
LCD Type B:
All ThinkPad 240X computers that have serial numbers
whose last five
letters are "ZAAAA" to "ZZZZZ" are fitted
with Type B panels.
The servicer need only check the fifth letter from the end.
If the fifth letter from the end is "B — Y" (inclusive), then
the LCD panel is Type A. If the fifth letter from the end is
"Z", then the LCD panel is Type B.
Read This First
Before you go to the checkout guide, be sure to read this
section.
Important Notes
Ÿ
Only certified trained personnel should service
the computer.
Ÿ
Read the entire FRU service procedures before
replacing any FRUs.
Ÿ
Use new nylon-coated screws when you replace
FRUs.
Ÿ
Be extremely careful during write operations such
as copying, saving, or formatting. Drives in the
computer that you are servicing might have been
rearranged or the drive startup sequence might have
been altered. If you select an incorrect drive, data or
programs might be overwritten.
Ÿ
Replace FRUs only for the correct model. When
you replace a FRU, make sure the model of the com-
puter and FRU part number are correct by referring to
the FRU parts list.
Ÿ
A FRU should not be replaced because of a
single, unreproducible failure. Single failures can
occur for a variety of reasons that have nothing to do
with a hardware defect, such as: cosmic radiation,
electrostatic discharge, or software errors. FRU
replacement should be considered only when a recur-
ring problem exists. If this is suspected, clear the
General Description
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