Lenovo ThinkPad X131e Chromebook Hardware Maintenance Manual - Page 18

LCD-related symptoms, Intermittent problems, Undetermined problems, Important, Notes - pixel

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Note: Do the FRU replacement or other actions in the sequence shown in the column headed "FRU or action, in sequence." If replacing a FRU does not solve the problem, put the original part back in the computer. Do not replace a nondefective FRU. This index can also help you determine what FRUs need to be replaced next during regular servicing. LCD-related symptoms Important: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The presence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns. If the LCD you are servicing has two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced. Notes: • This policy applies to all ThinkPad notebook computers purchased on 1 January, 2008 or later. • Lenovo will not provide warranty replacement if the LCD is within specifications because we cannot guarantee that any replacement LCD will have zero pixel defects • One pixel consists of R, G, B sub-pixels. Table 1. LCD-related symptoms Symptom or error No beep, power-on indicator on, and a blank LCD during POST. • LCD backlight not working • LCD too dark • LCD brightness cannot be adjusted. • LCD contrast cannot be adjusted. • LCD screen unreadable • Characters missing pixels • Screen abnormal • Wrong color displayed Horizontal or vertical lines displayed on LCD FRU or action, in sequence System board 1. Reseat the LCD connectors. 2. LCD assembly 3. System board 1. See important note for "LCD-related symptoms." 2. Reseat all LCD connectors. 3. LCD assembly 4. System board LCD assembly Intermittent problems Intermittent system hang problems can be due to a variety of causes 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 problem recurs. Undetermined problems If wrong devices are installed, or if the system simply is not operating, follow these procedures to isolate the failing FRU (do not isolate FRUs that have no defects). Verify that all attached devices are supported by the computer. Verify that the power supply being used at the time of the failure is operating correctly. (See "Power system checkout" on page 8 ) 1. Turn off the computer. 2. Visually check each FRU for damage. Replace any damaged FRU. 3. Remove or disconnect all of the following devices: 12 Hardware Maintenance Manual

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Note:
Do the FRU replacement or other actions in the sequence shown in the column headed “FRU or
action, in sequence.” If replacing a FRU does not solve the problem, put the original part back in the
computer. Do not replace a nondefective FRU.
This index can also help you determine what FRUs need to be replaced next during regular servicing.
LCD-related symptoms
Important:
The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The
presence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFT
LCD technology, but excessive pixel problems can cause viewing concerns. If the LCD you are servicing has
two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more
visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced.
Notes:
•
This policy applies to all ThinkPad notebook computers purchased on 1 January, 2008 or later.
•
Lenovo will not provide warranty replacement if the LCD is within specifications because we cannot
guarantee that any replacement LCD will have zero pixel defects
•
One pixel consists of R, G, B sub-pixels.
Table 1. LCD-related symptoms
Symptom or error
FRU or action, in sequence
No beep, power-on indicator on, and a blank LCD during
POST.
System board
•
LCD backlight not working
•
LCD too dark
•
LCD brightness cannot be adjusted.
•
LCD contrast cannot be adjusted.
1.
Reseat the LCD connectors
.
2. LCD assembly
3. System board
•
LCD screen unreadable
•
Characters missing pixels
•
Screen abnormal
•
Wrong color displayed
1.
See important note for “LCD-related symptoms.”
2. Reseat all LCD connectors.
3. LCD assembly
4. System board
Horizontal or vertical lines displayed on LCD
LCD assembly
Intermittent problems
Intermittent system hang problems can be due to a variety of causes 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 problem recurs.
Undetermined problems
If wrong devices are installed, or if the system simply is not operating, follow these procedures to isolate the
failing FRU (do not isolate FRUs that have no defects).
Verify that all attached devices are supported by the computer.
Verify that the power supply being used at the time of the failure is operating correctly. (See “Power system
checkout” on page 8 )
1. Turn off the computer.
2. Visually check each FRU for damage. Replace any damaged FRU.
3. Remove or disconnect all of the following devices:
12
Hardware Maintenance Manual