Lenovo ThinkPad W530 Hardware Maintenance Manual - Page 48

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

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Table 4. No-beep symptoms (continued) Symptom or error The power-on password prompt appears. The hard-disk password prompt appears. FRU or action, in sequence A power-on password or a supervisor password is set. Type the password and press Enter. A hard-disk password is set. Type the password and press Enter. 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 replacement if the LCD is within specification as we cannot guarantee that any replacement LCD will have zero pixel defects. • One pixel consists of R, G, B sub-pixels. Table 5. 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 the diagnostic tests did not identify the device that has failed, 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 32.) 42 Hardware Maintenance Manual

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Table 4. No-beep symptoms (continued)
Symptom or error
FRU or action, in sequence
The power-on password prompt appears.
A power-on password or a supervisor password is set.
Type the password and press
Enter
.
The hard-disk password prompt appears.
A hard-disk password is set. Type the password and
press
Enter
.
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 replacement if the LCD is within specification as we cannot guarantee that any
replacement LCD will have zero pixel defects.
•
One pixel consists of R, G, B sub-pixels.
Table 5. 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 the diagnostic tests did not identify the device that has failed, 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 32.)
42
Hardware Maintenance Manual