“Error messages” on page 44

“No-beep symptoms” on page 44

“LCD-related symptoms” on page 44

“Intermittent problems” on page 45

“Undetermined problems” on page 45

The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most likely cause is listed first, in boldface type.

Note: Do the FRU replacement or other actions in the sequence shown in the column headed “FRU or action, in sequence.” If replacing a FRU does not solve the problem, put the original part back in the computer. Do not replace a nondefective FRU.

This index can also help you determine, during regular servicing, what FRUs are likely to need to be replaced next.

A numeric error is displayed for each error detected in POST or system operation. In the displays, n can be any number.

If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not described there, go to “Intermittent problems” on page 45.

Note: For a device not supported by diagnostic codes in the ThinkPad Notebooks, see the manual for that device.

Numeric error codes

Table 2. Numeric error codes

Symptom or error (beeps, if any)

FRU or action, in sequence

 

 

0187

System board.

EAIA data access error—The access to EEPROM is failed.

 

 

(two short beeps)

 

 

 

 

0189

System board.

Invalid RFID configuration information area—The

 

 

EEPROM checksum is not correct.

 

 

(two short beeps)

 

 

 

 

 

0190

1.

Charge the battery pack.

Critical low-battery error

2.

Battery pack.

(two short beeps)

 

 

 

 

 

0191

1.

Run BIOS Setup Utility, and then save current

System Security—Invalid Remote Change requested.

 

setting by pressing F10.

 

2.

System board.

 

 

0210

Change keyboard, and restart the computer.

Stuck Key

 

 

(two short beeps)

 

 

 

 

0211

Run interactive tests of the keyboard and the auxiliary

Keyboard error

input device.

(two short beeps)

 

 

 

 

0230

System board.

Shadow RAM error—Shadow RAM fails at offset nnnn.

 

 

(two short beeps)

 

 

 

 

 

0231

1.

DIMM.

System RAM error—System RAM fails at offset nnnn.

2.

System board.

(two short beeps)

 

 

 

 

 

42Hardware Maintenance Manual

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Lenovo L421, L520, L420 manual Numeric error codes

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.