General checkout

Power system checkout

To verify a symptom, follow the steps below:

1.Turn off the computer.

2.Connect the AC adapter.

3.Make sure that power is supplied when you turn on the computer.

4.Turn off the computer.

5.Disconnect the AC adapter.

6.Make sure that the battery pack supplies power when you turn on the computer.

If you suspect a power problem, see the appropriate one of the following power supply checkouts:

•• “Checking the AC adapter ” on page 21

•• “Checking operational charging” on page 21

Checking the AC adapter

You are here because the computer fails only when the AC adapter is used.

•• If the power-on indicator does not turn on, check the power cord of the AC adapter for correct continuity and installation.

•• If the computer does not charge during operation, go to “Checking operational charging”.

To check the AC adapter, follow the steps below:

1.Unplug the AC adapter cable from the computer.

2.Measure the output voltage at the plug of the AC adapter cable. See the following figure:

Pin

Voltage (V DC)

 

 

1

+20

 

 

2

0

2

1

Note: Output voltage for the AC adapter pin No. 2 may differ from the one you are servicing.

3.If the voltage is not correct, replace the AC adapter.

4.If the voltage is acceptable, do the following:

•• Replace the system board.

•• If the problem continues, go to “Lenovo IdeaPad U300/U300s/U400” on page 27.

Note: Noise from the AC adapter does not always indicate a defect.

Checking operational charging

To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer.

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Lenovo U300S, U400 manual Power system checkout, Checking the AC adapter, Checking operational charging
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U300S, U400 specifications

Lenovo has made significant strides in the market for ultrabooks with its U400 and U300S models, which combine style, performance, and portability. These laptops cater to users seeking powerful devices without compromising on design or usability.

The Lenovo U400 is a versatile ultrabook that excels in performance and efficiency. It features a 14-inch display with a resolution of 1366 x 768 pixels, providing clear visuals and an enjoyable viewing experience. The U400 is powered by Intel's second generation Core processors, which ensures fast computing speeds and responsiveness for both work and multimedia tasks. It also integrates dedicated NVIDIA graphics, which enhances gaming experiences and accelerates tasks that require graphical processing.

On the other hand, the Lenovo U300S takes a more premium approach with its ultra-slim design. This ultrabook sports a 13.3-inch display, also with a resolution of 1366 x 768 pixels, making it lightweight and easy to carry without sacrificing screen quality. The U300S is equipped with Intel’s Ivy Bridge processors, marking an advancement in speed and power efficiency over its predecessor. Furthermore, the laptop is designed with a unibody aluminum chassis, providing durability while maintaining an elegant aesthetic.

Both models support Lenovo Enhanced Experience, which features RapidBoot technology for quick system startup and Lenovo Cloud Services, allowing seamless integration with cloud storage solutions. This provides users the convenience of accessing their data anywhere at any time.

Battery life is another crucial feature of the U400 and U300S. The U400 boasts up to 6 hours of battery life, making it suitable for users on the go. Meanwhile, the U300S offers even more longevity, with up to 8 hours of use on a single charge, further emphasizing its suitability for travel and mobility.

In terms of connectivity, both laptops offer USB 3.0 ports, HDMI output, and Wi-Fi capability, ensuring users stay connected and have options for high-speed data transfer and display output.

Overall, Lenovo's U400 and U300S models represent a blend of advanced technology, stylish design, and practicality, making them strong contenders in the ultrabook market. Their performance, coupled with Lenovo's innovative features, showcases the brand's commitment to delivering highly functional and appealing laptops for a range of users.
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