Lenovo 019923U Hardware Maintenance Manual

Contents

Error messagesTable 3. Error messagesSymptom or error (beeps, if any) FRU or action, in sequenceBad CRC2. Enter BIOS Setup Utility, and load Setupdefaults.(two short beeps)Press F1 to enter BIOS Setup Utility. Press F9, andEnter to load the default setting. Then save the currentsetting 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.(one short beep, pause, three short beeps, pause, threeshort beeps, pause, one short beep.)Memory card is not installed. Install memory card.DRAM is not well plugged.(one short beep, pause, three short beeps, pause, threeshort beeps, pause, one short beep.)Reinstall the memory card.Operating system not found. 1. Check that the operating system has no failureand is installed correctly.2. Enter BIOS Setup Utility and see whether the harddisk drive is properly identified. If you still see thesame error message, check the boot sequence.3. Reinstall the hard disk drive.4. Reinstall the operating system.System Configuration Data Read Error(two short beeps)Press F1 to enter BIOS Setup Utility. Press F9, andEnter to load the default setting. Then save the currentsetting by pressing F10, and restart the computer.No-beep symptomsTable 4. No-beep symptomsSymptom or error FRU or action, in sequenceNo beep, power-on indicator on, LCD blank, and noPOST.1. Make sure that every connector is connectedtightly and correctly.2. Memory module.3. System board.No beep, power-on indicator on, and LCD blank duringPOST.1. Reseat Memory module.2. System board.The power-on password prompt appears. A power-on password or a supervisor password is set.Type the password and press Enter.The hard-disk password prompt appears. A hard-disk password is set. Type the password andpress Enter.LCD-related symptomsImportant: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). Thepresence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFTLCD 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 andit should be replaced.Chapter 4. Related service information 45