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:

vThis policy applies to all ThinkPad Notebooks purchased on 1 January, 2008 or later.

vLenovo will not provide replacement if the LCD is within specification as we cannot guarantee that any replacement LCD will have zero pixel defects.

vOne pixel consists of R, G, B sub-pixels.

Table 6. LCD-related symptoms

Symptom or error

FRU or action, in sequence

 

 

No beep, power-on indicator on, and a

System board.

blank LCD during POST.

 

 

 

 

 

v LCD backlight not working.

1.

Reseat the LCD connectors.

v

LCD too dark.

2.

LCD assembly.

v LCD brightness cannot be adjusted.

3.

System board.

v LCD contrast cannot be adjusted.

 

 

v

LCD screen unreadable.

1.

See important note for “LCD-related

v

Characters missing pixels.

 

symptoms.”

v

Screen abnormal.

2.

Reseat all LCD connectors.

v

Wrong color displayed.

3.

LCD assembly.

 

 

4.

System board.

 

 

Horizontal or vertical lines displayed on

LCD assembly.

LCD.

 

 

 

 

 

 

68ThinkPad T400 and R400 Hardware Maintenance Manual

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Lenovo R400 LCD-related symptoms, Reseat the LCD connectors, See important note for LCD-related, Symptoms, LCD assembly

R400 specifications

The Lenovo R400 is a business laptop that was designed for professionals seeking a balance of performance, durability, and mobility. It is part of Lenovo's renowned ThinkPad series, which is known for its robust build quality and user-centric features. The R400 combines an array of technologies and characteristics that cater specifically to the demands of the modern workplace.

One of the standout features of the Lenovo R400 is its powerful processor options. Depending on the configuration, it can be equipped with Intel Core 2 Duo processors, which provide efficient multitasking capabilities and commendable performance for typical business applications. This ensures that users can run multiple applications seamlessly, whether it’s for data analysis, presentations, or video conferencing.

In terms of design, the R400 maintains the classic ThinkPad aesthetic with a lightweight chassis that makes it portable for professionals on the go. It typically weighs around 5.2 pounds, making it convenient for travel while still offering a sturdy construction that can withstand daily use. The spill-resistant keyboard is another practical characteristic, enabling users to work without worrying about minor accidents. The keyboard itself is celebrated for its comfortable layout and tactile feedback, ideal for prolonged typing sessions.

The display is another critical aspect of the R400. It generally features a 14.1-inch widescreen model, providing adequate screen real estate for productivity tasks. With a resolution of 1440 x 900, the screen delivers crisp visuals and vibrant colors, enhancing the viewing experience for both presentations and media consumption.

Connectivity is robust, with multiple USB ports, Ethernet, and optional Bluetooth capabilities that facilitate seamless communication and file transfers. The presence of both VGA and display port outputs makes it easy to connect to projectors or external monitors, an essential feature for professional presentations.

Security features also play a crucial role in the R400's design. It typically offers features like a fingerprint reader, a Trusted Platform Module (TPM) for data encryption, and a robust BIOS that helps safeguard sensitive information, which is critical for professionals handling confidential data.

In summary, the Lenovo R400 stands out as a reliable business laptop, blending performance, durability, and features tailored to meet the needs of the modern workforce. Its powerful processing capabilities, user-friendly design, and robust security measures make it an attractive choice for professionals requiring a dependable and efficient mobile computing solution.