Lenovo B575 manual Power system checkout, Checking the AC adapter, Checking operational charging

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General checkout

Power system checkout

To verify a symptom, follow the steps below:

1.Turn off the computer.

2.Remove the battery pack.

3.Connect the AC adapter.

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

5.Turn off the computer.

6.Disconnect the AC adapter and install the charged battery pack.

7.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 battery pack” on page 22

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 B575” 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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Contents Lenovo B575 Page Contents Lenovo B575 About this manualSafety information General safety Electrical safety Lenovo B575 Hardware Maintenance Manual Safety inspection guide Grounding requirements Safety notice Safety notices multilingual translationsLenovo B575 Hardware Maintenance Manual Safety information Lenovo B575 Hardware Maintenance Manual Safety information Lenovo B575 Hardware Maintenance Manual Safety information Laser compliance statement Safety information Strategy for replacing FRUs Before replacing partsImportant notice for replacing a system board Strategy for replacing a hard disk driveOriginal part Important information about replacing RoHS compliant FRUsGeneral checkout What to do first Following are not covered under warrantyChecking the AC adapter Power system checkoutChecking operational charging Checking the battery pack Restoring the factory contents by using OneKey Recovery Related service informationPower-on password PasswordsSupervisor password Screen blank mode Power managementSleep standby mode Hibernation mode Feature Description SpecificationsWlan Indicator Meaning Status indicatorsOff Blinking whiteFlashing white Key combination Description Fn key combinationsScrew notices FRU replacement noticesPlastic to plastic Logic card to plasticRemoving and replacing an FRU Removal steps of battery pack Battery packRemoval steps of dummy cards Dummy cardLoosen five screws a, then remove the compartment cover b Step Screw quantity Color Torque Hard disk driveRemoval steps of optical drive Optical driveRemoval steps of Dimm DimmRemoval steps of PCI Express Mini Card for wireless LAN/WAN PCI Express Mini Card for wireless LAN/WANWhen installing Removal steps of keyboard KeyboardLenovo B575 Lenovo B575 Hardware Maintenance Manual Removal steps of keyboard bezel Keyboard bezelRemove the screw c Lenovo B575 M2 × 3.5 mm, flat-head, nylok-coated Black Kgfcm Important notices for handling the system board System boardRemoval steps of system board Lenovo B575 Removal steps of LCD unit LCD unitRemove the LCD unit in the direction shown by arrows c Removal steps of fan assembly and heat sink assembly Fan assembly and Heat Sink assemblyLenovo B575 Base cover, speakers and bluetooth card Lenovo B575 Removal steps of LCD front bezel LCD front bezelRemoval steps of LCD panel, LCD cable and hinges LCD panel, LCD cable and hingesM2 × 2.5, flat-head, nylokcoated Black Kgfcm Lenovo B575 Removal steps of integrated camera Integrated cameraRemoval steps of antenna assembly and LCD cover Antenna assembly and LCD coverFront view LocationsRight-side view Bottom and Left-side view Parts list Overall Parts list-Overall LA57 Lower Case UMA NEW W/SPEAKER/DC-IN LA57 HDD Door Assy LCD FRUs 15.6-in. HD TFT Keyboard Lenovo B575 Miscellaneous parts Parts list-Miscellaneous partsAC adapters Parts list-3-pin AC adaptersParts list-3-pin power cords Power cordsLenovo B575 Lenovo B575 Hardware Maintenance Manual Page Trademarks

B575 specifications

The Lenovo B575 is a notable entry in the realm of budget-friendly laptops, catering to users who seek a reliable and functional machine without breaking the bank. This device embodies the essential features and technologies that are ideal for everyday computing tasks, making it a popular choice for students, professionals, and casual users alike.

One of the standout features of the Lenovo B575 is its ergonomic design. The laptop sports a sleek and compact chassis, which makes it highly portable and easy to carry. Weighing in at just around 5.5 pounds, it is an adequate companion for individuals who are always on the go. Additionally, the 15.6-inch display provides ample screen real estate for various tasks, with a resolution that delivers clear and vibrant visuals, enhancing the overall viewing experience.

Under the hood, the Lenovo B575 is powered by AMD processors, commonly featuring the AMD E-Series or A-Series APUs. These processors are known for their balance of performance and energy efficiency, allowing users to enjoy seamless multitasking capabilities without excessive power consumption. Whether it’s browsing the web, streaming media, or working on documents, the B575 handles these tasks effectively.

To complement its processing power, the B575 generally comes with a standard configuration of 4GB of RAM, which can be upgraded depending on the user's needs. This memory configuration ensures smooth performance during typical usage scenarios. The device also offers a variety of storage options, including traditional hard drives, which provide ample space for files and applications.

Connectivity is another strong point of the Lenovo B575. It features multiple USB ports, an HDMI output for connecting to external displays, and a built-in card reader. The inclusion of Wi-Fi and Ethernet capabilities ensures that users can stay connected to the internet, whether at home, in the office, or on the move.

The B575's battery life is commendable for a budget laptop, allowing for several hours of usage on a single charge. This longevity is particularly appealing for students or professionals who may not have immediate access to power outlets.

In summary, the Lenovo B575 offers a robust set of features and capabilities that cater to everyday computing demands. Its balance of performance, portability, and functionality makes it an attractive option for users seeking an affordable laptop that meets their essential needs while providing a satisfying user experience.
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