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

Press F1 to enter BIOS Setup Utility. Press F9, and

defaults.

Enter to load the default setting. Then save the current

(two short beeps)

setting by pressing F10, and restart the computer.

 

 

 

Fan error.

1.

Fan.

(four short beeps, one long beep)

2.

Thermal grease.

 

3.

System board.

 

 

DRAM is unplugged.

Install the DRAM.

(four short beeps, pause, three short beeps, pause, one

 

 

short beep, pause, one short beep)

 

 

 

 

DRAM is not well plugged.

Reinstall the DRAM.

(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.)

 

 

 

 

 

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

Turn off the computer and remove the WAN card.

remove the miniPCI network card.

 

 

(two short beeps)

 

 

 

 

System Configuration Data Read Error

Press F1 to enter BIOS Setup Utility. Press F9, and

(two short beeps)

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

FRU or action, in sequence

 

 

 

No beep, power-on indicator on, LCD blank, and no

1.

Make sure that every connector is connected

POST.

 

tightly and correctly.

 

2.

DIMM.

 

3.

System board.

 

 

 

No beep, power-on indicator on, and LCD blank during

1.

Reseat DIMM.

POST.

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 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.

44Hardware Maintenance Manual

Page 49 Page 51
Page 50
Image 50
Lenovo L420, L421, L520 manual Error messages, No-beep symptoms, LCD-related symptoms
Page 49 Page 51

L420, L520, L421 specifications

The Lenovo L421, L520, and L420 are part of Lenovo's ThinkPad series, which is known for its reliability, durability, and performance. These models are designed primarily for business professionals and students, providing a blend of functionality and portability tailored for everyday computing.

The Lenovo L421 is equipped with the second-generation Intel Core processors, which enhance its performance and efficiency. It features a 14-inch LED backlit display, offering sharp visuals and sufficient screen real estate for multitasking. The L421 also sports a spill-resistant keyboard, ensuring that accidental spills do not affect the device's functionality. This model supports up to 8GB of RAM and incorporates various connectivity options, including USB 3.0 ports, HDMI, and an SD card reader, which makes it versatile for various peripherals.

The L520 is another solid offering from Lenovo, featuring a slightly larger 15.6-inch display for increased productivity. It shares many characteristics with the L421, such as the use of Intel’s second-generation processors. The L520 also emphasizes security with features like a fingerprint reader and a Trusted Platform Module (TPM) for data encryption, appealing to businesses that require stringent security measures. Its ExpressCard and docking station compatibility add flexibility, allowing users to tailor their setups according to their needs.

The L420, like its siblings, comes with an emphasis on performance and utility. With a 14-inch HD display, it offers vibrant visuals. The L420 also benefits from Lenovo's legendary keyboard design, which ensures a comfortable typing experience. This model is geared for users who require a balance between performance and portability without compromising on essential features. The same Intel Core processors and security features are incorporated, ensuring a reliable experience for professional applications.

All three models feature Lenovo's innovative Power Management technology, which optimizes battery life, allowing users to work longer hours without needing to recharge. Additionally, they are built with robust materials that ensure longevity, making them suitable for both office and on-the-go environments.

Overall, the Lenovo L421, L420, and L520 exemplify the ThinkPad series' commitment to performance, security, and durability, making them excellent choices for anyone looking for reliable laptops for professional use.
Top Page Image Contents