IBM 2658 Hardware Maintenance Manual - Page 55

LCD-Related Symptoms, LCD FRU Replacement Notice

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LCD-Related Symptoms LCD FRU 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. Symptom/Error FRU/Action in Sequence LCD backlight does not work. LCD is too dark. LCD brightness cannot be adjusted. v Keyboard (if contrast and brightness function keys do not work) v Reseat LCD connector v Check LCD inverter ID v LCD Cable ASM v LCD Inverter/LED board (13.3″/14.1″) v LCD v System board Unreadable LCD screen. Missing pixels in characters. v Reseat LCD connector v Check LCD inverter ID v LCD Cable ASM Abnormal screen Wrong color displayed. v LCD Inverter/LED board (13.3″/14.1″) v LCD v System board LCD has extra horizontal or vertical lines displayed. v Check LCD inverter ID v LCD Cable ASM v LCD Inverter/LED board (13.3″/14.1″) v LCD v System board MT 2658/2659/2677 49

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LCD-Related Symptoms
LCD FRU 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.
Symptom/Error
FRU/Action in Sequence
LCD backlight does not
work.
LCD is too dark.
LCD brightness cannot
be adjusted.
v
Keyboard (if contrast and
brightness function keys do not
work)
v
Reseat LCD connector
v
Check LCD inverter ID
v
LCD Cable ASM
v
LCD Inverter/LED board
(13.3
″
/14.1
″
)
v
LCD
v
System board
Unreadable LCD screen.
Missing pixels in
characters.
Abnormal screen
Wrong color displayed.
v
Reseat LCD connector
v
Check LCD inverter ID
v
LCD Cable ASM
v
LCD Inverter/LED board
(13.3
″
/14.1
″
)
v
LCD
v
System board
LCD has extra horizontal
or vertical lines
displayed.
v
Check LCD inverter ID
v
LCD Cable ASM
v
LCD Inverter/LED board
(13.3
″
/14.1
″
)
v
LCD
v
System board
MT 2658/2659/2677
49