Lenovo ThinkPad 760EL-ELD ThinkPad 380, 385, 560, 560E, all 760, 765 and Selec - Page 570

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 unit 3. DC/DC card 4. Cable for inverter card 5. Inverter card 1. See important note for "LCD-Related Symptoms" on page 47. 2. Reseat all LCD connectors. 3. LCD unit 4. System board 5. Video card 1. LCD cable assembly 2. LCD unit Modem (DSP)-Related Symptoms Symptom / Error In OS/2, DOS, or Windows multimedia programs, no sound comes from the computer. (Only system beeps are heard at power-on.) In OS/2, DOS, or Windows, the modem does not work. FRU / Action in Sequence Check that the device driver is installed correctly. Check that the DSP Modem is active. OS/2 and Windows: Click the DSP Modem icon in the ThinkPad Configuration program. DOS: Run the MWMODEM ON command. 558 IBM Mobile Systems HMM