Lenovo ThinkPad 760XL ThinkPad 380, 385, 560, 560E, all 760, 765 and SelectADo - Page 453
LCD-Related Symptoms
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Symptom / Error No beep during POST but system runs correctly. FRU / Action in Sequence 1. Turn the volume up and check the speaker. 2. Check whether the DSP card or audio (ESS) card connector is loose and reseat the connector. 3. Speaker 4. DSP card or audio (ESS) card 5. DC/DC card LCD-Related Symptoms Important The LCD for the notebook computer contains over 2,359,296 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. 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 screen unreadable Characters missing pels Screen abnormal Wrong color displayed LCD has extra horizontal or vertical lines displayed. FRU / Action in Sequence 1. Reseat the CPU card. 2. DC/DC card 3. Video card 4. System board 5. LCD cable assembly 1. Reseat the LCD connectors. 2. LCD assembly 3. DC/DC card 4. Cable for inverter card 5. Inverter card 1. See important note for "LCD-Related Symptoms." 2. Reseat all LCD connectors. 3. LCD assembly 4. System board 5. Video card 1. LCD cable assembly 2. LCD assembly ThinkPad 765D (9546), 765L (9547) 441
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