Lenovo ThinkPad L520 Hardware Maintenance Manual - Page 52
Error messages, No-beep symptoms, LCD-related symptoms
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Error messages Table 3. Error messages Symptom or error (beeps, if any) FRU or action, in sequence Bad CRC2. Enter BIOS Setup Utility, and load Setup defaults. (two short beeps) Press F1 to enter BIOS Setup Utility. Press F9, and Enter to load the default setting. Then save the current setting by pressing F10, and restart the computer. Fan error. (four short beeps, one long beep) 1. Fan. 2. Thermal grease. 3. System board. DRAM is unplugged. (four short beeps, pause, three short beeps, pause, one short beep, pause, one short beep) Install the DRAM. DRAM is not well plugged. (seven short beeps, one long beep, four short beeps, one long beep, one short beep, one long beep, one short beep, one long beep till forever.) Reinstall the DRAM. Operating system not found. 1. Check that the operating system has no failure and is installed correctly. 2. Enter BIOS Setup Utility and see whether the hard disk drive is properly identified. If you still see the same error message, check the boot sequence. 3. Reinstall the hard disk drive. 4. Reinstall the operating system. Unauthorized network card is plugged in - Power off and remove the miniPCI network card. (two short beeps) Turn off the computer and remove the WAN card. System Configuration Data Read Error (two short beeps) Press F1 to enter BIOS Setup Utility. Press F9, and Enter to load the default setting. Then save the current setting by pressing F10, and restart the computer. 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. DIMM. 3. System board. 1. Reseat DIMM. 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. 46 Hardware Maintenance Manual