Lenovo ThinkPad T430s Hardware Maintenance Manual - ThinkPad T430s and T430si - Page 47
No-beep symptoms, LCD-related symptoms, Important, Notes - notebook
View all Lenovo ThinkPad T430s manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 47 highlights
Table 3. Beep symptoms (continued) Symptom or error Three short beeps, pause, three more short beeps, and one short beep. One short beep, pause, three short beeps, pause, three more short beeps, and one short beep. Only the cursor appears. Four cycles of four short beeps and a blank screen. Five short beeps and a blank screen. FRU or action, in sequence 1. memory module. 2. System board Reinstall the operating system. System board (security chip) System board No-beep symptoms Table 4. No-beep symptoms Symptom or error No beep, power-on indicator on, LCD blank, and no POST. No beep, power-on indicator on, and LCD blank during POST. The power-on password prompt appears. The hard-disk password prompt appears. FRU or action, in sequence 1. Make sure that every connector is connected tightly and correctly. 2. memory module. 3. System board. 1. Reseat memory module. 2. System board. A power-on password or a supervisor password is set. Type the password and press Enter. A hard-disk password is set. Type the password and press Enter. 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.If the LCD you are servicing has two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced. Notes: • This policy applies to all ThinkPad notebooks purchased on 1 January, 2008 or later. • Lenovo will not provide replacement if the LCD is within specification as we cannot guarantee that any replacement LCD will have zero pixel defects. • One pixel consists of R, G, B sub-pixels. Table 5. LCD-related symptoms Symptom or 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. • LCD contrast cannot be adjusted. FRU or action, in sequence System board. 1. Reseat the LCD connectors. 2. LCD assembly. 3. System board. Chapter 4. Related service information 41