IBM R50p Series User Manual download pdf (Page 65)

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. 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.

v SXGA+: 11 or more bright dots, 13 or more dark

dots, or a total of 16 or more bright and dark

dots.

v UXGA: 11 or more bright dots, 16 or more dark

dots, or a total of 16 or more bright and dark

dots.

v QXGA: 15 or more bright dots, 16 or more dark

dots, or a total of 16 or more bright and dark

dots.

Note:

A bright dot means a pixel is always on

(white or color.) A dark dot means a pixel is

always off (black color.)

Symptom or error FRU or action, in sequence

No beep, power-on indicator

on, and a blank LCD during

POST.

System board.

v LCD backlight not working.

v LCD too dark.

v LCD brightness cannot be

adjusted.

v LCD contrast cannot be

adjusted.

1. Reseat the LCD

connectors.

2. LCD assembly.

3. System board.

v LCD screen unreadable.

v Characters missing pixels.

v Screen abnormal.

v 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.

Symptom-to-FRU index

ThinkPad R50/R50p and R51 Series 61

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 277 278

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IBM R50p Series User Manual Page 65

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