Lenovo ThinkPad 760XL ThinkPad 380, 385, 560, 560E, all 760, 765 and SelectADo - Page 59
LCD-Related Symptoms, Keyboard/TrackPoint III-Related Symptoms
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LCD-Related Symptoms Important The 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 dots satisfies the following condition: The number of missing, discolored, or lighted dots in any background is 21 or more. Symptom / 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 (TFT) LCD contrast cannot be adjusted (STN) LCD screen unreadable Characters missing pels Screen abnormal Wrong color displayed LCD has extra horizontal or vertical lines displayed. FRU / Action in Sequence 1. System board 2. Subcard 1. Reseat the LCD connectors. 2. LCD unit 3. Subcard 1. See important note for "LCD-Related Symptoms." 2. Reseat all LCD connectors. 3. LCD unit 4. System board 5. Subcard LCD unit Keyboard/TrackPoint III-Related Symptoms Symptom / Error FRU / Action in Sequence Keyboard (one or more keys) does not work. 1. Reseat the keyboard cable on the subcard. 2. Keyboard 3. Subcard 4. System board TrackPoint III does not work. 1. Reseat the keyboard cable on the subcard. 2. Go to "TrackPoint III Checkout" on page 32. 3. Keyboard 4. Subcard 5. System board ThinkPad 380, 385 (2635) 47
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