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FRU Service Procedures
Review these service procedures before replacing a FRU.
LCD FRU Replacement Notice:
If missing or
discolored dots appear on the LCD, carefully read the
following note to determine whether or not you should
replace the LCD.
The LCD for the Model 700C and 720C contains over
921 000 thin film transistors (TFTs). A small number of
missing, discolored or lighted dots (on all the time) is
characteristic of TFT LCD technology. 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 21 or more.
Hinges on the color LCD are part of the FRU and are
returned with the FRU.
700, 720 Mono LCD FRU Replacement:
Hinges are NOT part of the Model 700 or 720 mono LCD
FRU (do not return them with the FRU). When replacing
the Model 700 or 720 mono LCD, remove the right and left
hinge bracket supports and install them on the new LCD.
Return only the main FRU. The left and right hinge
bracket supports are included in the Mono Panel Cover
Group Kit.
High-Speed Modem Noise Problems:
A small
number of high speed modems might produce a noise
when the system is powered-on. To solve this problem,
copy PS2.EXE from the Reference Diskette to the root
directory using the UINSTALL program. Then, add the
following lines to the AUTOEXEC.BAT file.
PS2 SET MODEM OFF
PS2 SET MODEM ON
If this does not solve the problem, replace the modem.
124
IBM Mobile Systems HMM
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