Lenovo ThinkPad 365E-ED ThinkPad 365, SelectaDock I - Hardware Maintenance Man - Page 298

No Beep Symptoms Symptom / Error FRU / Action in Sequence No beep, power-on indicator not on, and a blank LCD during POST. 1. Go to "Power Systems Checkout" on page 272. 2. System Board 3. Power sources No beep, power-on indicator on, and a blank LCD during POST. 1. System Board No beep, power-on indicator on, and a blinking cursor only during POST. 1. System Board No beep during POST but system runs correctly. 1. Turn the volume up and check the speaker. 2. Speaker 3. System Board 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, or LCD too dark, or LCD brightness cannot be adjusted, or LCD contrast cannot be adjusted. LCD screen unreadable, or Characters missing pels, or Screen abnormal, or Wrong color displayed. FRU / Action in Sequence 1. System Board 1. Reseat the LCD connectors. 2. LCD Assembly 1. See important note for "LCD-Related Symptoms." 2. Reseat all LCD connectors. 3. LCD Assembly 4. System Board 286 IBM Mobile Systems - ThinkPad HMM Volume 3