Lenovo ThinkPad 770 Hardware Maintenance Manual for 770 series notebooks(Janua - Page 69

Infrared-Related Symptoms, Keyboard- or TrackPoint-Related Symptoms

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SYMPTOM-TO-FRU INDEX Infrared-Related Symptoms Symptom / Error FRU / Action in Sequence Unable to communicate using the Infrared (IR) Port. 1. Make sure the setup for the IR is correct. Use the ThinkPad Configurations utility. 2. Make sure there are no fluorescent lights near the computer. The computer may receive optical noise from the fluorescent light. 3. Run the advanced diagnostic test. If an error occurs and a FRU code is displayed, replace the parts shown by the FRU code. Keyboard- or TrackPoint-Related Symptoms Symptom / Error FRU / Action in Sequence Keyboard (one or more keys) does not work. 1. Reseat the keyboard cables on the video card. 2. Keyboard 3. Video card 4. System board TrackPoint does not work. 1. Reseat the keyboard cables on the video card. 2. Go to "TrackPoint Checkout" on page 39. 3. Keyboard 4. Video card 5. System board Pointer moves automatically or does not work correctly. See "TrackPoint Checkout" on page 39. LCD-Related Symptoms Important The TFT LCD for the notebook computer 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, 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 21 or more. ThinkPad 770, 770E, 770X and 770Z 63

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SYMPTOM-TO-FRU INDEX
Infrared-Related Symptoms
Symptom / Error
FRU / Action in Sequence
Unable to communicate
using the Infrared (IR) Port.
1.
Make sure the setup
for the IR is correct.
Use the ThinkPad
Configurations utility.
2.
Make sure there are
no fluorescent lights
near the computer.
The computer may
receive optical noise
from the fluorescent
light.
3.
Run the advanced
diagnostic test. If an
error occurs and a
FRU code is displayed,
replace the parts
shown by the FRU
code.
Keyboard- or TrackPoint-Related
Symptoms
Symptom / Error
FRU / Action in Sequence
Keyboard (one or more
keys) does not work.
1.
Reseat the keyboard
cables on the video
card
.
2.
Keyboard
3.
Video card
4.
System board
TrackPoint does not work.
1.
Reseat the keyboard
cables on the video
card
.
2.
Go to “TrackPoint
Checkout” on page
39.
3.
Keyboard
4.
Video card
5.
System board
Pointer moves automatically
or does not work correctly.
See “TrackPoint
Checkout” on page
39.
LCD-Related Symptoms
Important
The TFT LCD for the notebook computer 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, 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
21 or
more
.
ThinkPad 770, 770E, 770X and 770Z
63