Lenovo B575 Support Question
Lenovo B575 Support Question
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Question posted by stepst on May 10th, 2014
What Makes A Lenovo B575 Not Power Up
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Answer #1: Posted by freginold on May 15th, 2014 5:53 AM
freginold
Member since:
December 20th, 2011 Points: 23,253,885
Member since:
December 20th, 2011 Points: 23,253,885
Usually when a laptop won't power on, it's because of one of three things: the battery, the battery charger/AC adapter, or the motherboard (or power board, if the laptop has a separate power board that connects to the motherboard).
You can rule out the battery easily by attaching the AC adapter and trying to turn the laptop on. If your AC adapter has an LED on it, you can often tell if the adapter isn't working because the LED won't light up. (However, just because the LED does come on doesn't mean the adapter is working as it should.)
The motherboard is the most expensive option to replace, so a good rule of thumb is to get a new AC adapter/charger and see if the laptop powers up with that. If it still won't power on, you may have a bad motherboard, in which case it might be cheaper to get a new laptop than have the motherboard repaired or replaced. If you can determine that it's the power board rather than the motherboard, replacing that board might be a more attractive option than replacing the whole computer.
Related Lenovo B575 Manual Pages
Lenovo B575 Setup Poster V1.0 - Page 1
... may result in damages to find some installation backups for Windows operating system or Web site logon, you can visit the Lenovo Idea product support site to the AC adapter.
3 Press the power button
B575
4 Configure the operating system following the on special features, see the Help file of your retailer. Users of...
Hardware Maintenance Manual - Page 3
... about replacing RoHS compliant FRUs 18
General checkout 19 What to do first 20 Power system checkout 21
Checking the AC adapter 21 Checking operational charging 21 Checking the ...recovery discs 23 Passwords 24 Power-on password 24 Supervisor password 24 Power management 25 Screen blank mode 25 Sleep (standby) mode 25 Hibernation mode 26
Lenovo B575 27 Specifications 27 Status ...
Hardware Maintenance Manual - Page 4
..., guidelines, and safety
information required for trained servicers who are familiar with Lenovo products. iv Before servicing a Lenovo product, make sure to troubleshoot problems effectively. About this manual
This manual contains service and reference information for the following Lenovo product:
Lenovo B575 Use this manual to read all the information under "Safety information" on...
Hardware Maintenance Manual - Page 6
.... If your hair is long, fasten it. • Insert the ends of internal components. Lenovo B575 Hardware Maintenance Manual
General safety
Follow these rules below to your eyes. • After service,... walk areas so that other service representatives and the customer are not in your feet. 3. Make sure that your sleeves are servicing the machine. • Keep your toolcase away from the...
Hardware Maintenance Manual - Page 8
... touch live electrical circuits with the reflective surface of a plastic dental mirror. Caution: do not become a victim yourself. - Pumps - Lenovo B575 Hardware Maintenance Manual
• Always look carefully for possible hazards in a machine: - Power supply units - Examples of the units.)
• If an electrical accident occurs: - The surface is conductive; Switch off the...
Hardware Maintenance Manual - Page 10
...handling ESD-sensitive devices. • Select a grounding system, such as fully effective. Lenovo B575 Hardware Maintenance Manual
Handling devices that are sensitive to electrostatic discharge
Any computer part containing... below, to any frame ground, ground braid, or greenwire ground.
- Notes: 1. Make sure that the ESD protective devices you are all at the same charge.
Use product-...
Hardware Maintenance Manual - Page 20
... are posted on the customer support site: http://consumersupport.lenovo.com/. Follow the directions on the screen and install ... action. Enter a serial number or select a product or use Lenovo smart downloading. 3. "Strategy for replacing a system board" on ...hard disk drive" on page 17 - Lenovo B575 Hardware Maintenance Manual
Important service information
This chapter presents the following...
Hardware Maintenance Manual - Page 24
... use of a nonsupported device • Forgotten computer password (making the computer unusable) • Sticky keys caused by referring to...
material in which the machine failed 4. Date on laptop products
The following symptoms might be responsible for warranty:...Missing parts might indicate damage caused by the customer. Lenovo B575 Hardware Maintenance Manual
What to do first
When you do...
Hardware Maintenance Manual - Page 25
... output voltage at the plug of the total power remaining when installed in the computer.
21 If the voltage is not correct, replace the AC adapter. 4. See the
following : • Replace the system board. • If the problem continues, go to "Lenovo B575" on the
computer. Make sure that has less than 50% of...
Hardware Maintenance Manual - Page 26
... If the voltage is not correct, replace the battery pack.
To get detailed information about the battery, double-click the Power Meter icon. Remove it from having a shortened life. If the resistance is still not charged, go to 30 KΩ..., even though the indicator does not light on , replace the system board. Lenovo B575 Hardware Maintenance Manual
Perform operational charging.
Hardware Maintenance Manual - Page 27
...Recovery" on page 23 • "Passwords" on page 24 • "Power management" on the system partition (C drive), which is shipped. Note: This... recovery discs. Make sure to back up data to restore your critical data before you replace a hard disk drive in a Lenovo computer includes a...For details of factory default
The Lenovo B575 computers come with pre-installed OneKey Rescue System. In order ...
Hardware Maintenance Manual - Page 28
.... Passwords
As many as two passwords may be booted. Power-on password
A power-on password (POP) protects the system from being powered on . Attention: If the SVP has been forgotten and... the BIOS Setup Utility.
The system board must be made available to reset the password.
Lenovo B575 Hardware Maintenance Manual
When you use the recovery discs to the BIOS Setup Utility and change...
Hardware Maintenance Manual - Page 30
...is turned on, the computer returns from the hard disk drive.
26 Pressing the power button. To cause the computer to go into hibernation mode automatically in suspend mode....If a "hibernation time" has been set on the hard disk. • The system is powered off. Lenovo B575 Hardware Maintenance Manual
Hibernation mode
In hibernation mode, the following occurs: • The system status...
Hardware Maintenance Manual - Page 34
... of it is also turned off : System is in hibernate mode or shut down. White: The remaining power of the battery is more than 5% of its capacity. Lenovo B575 Hardware Maintenance Manual
d Power on )
The remaining power of the battery is less than 80% of its capacity, or the computer is operating on and not...
Hardware Maintenance Manual - Page 36
... do not easily come loose, even with special nylon-coated screws that you removed. Lenovo B575 Hardware Maintenance Manual
FRU replacement notices
This section presents notices related to the torque shown in...; Ensure torque screwdrivers are harder to the "Torque" column for each step.
• Make sure that all screws firmly to removing and replacing parts. Read this machine: • ...
Hardware Maintenance Manual - Page 37
... board is sensitive to, and can cause electrical short circuits. Make sure to replacement. When replacing an FRU, use the correct...in the procedures. Any of the notes that all power cords from electrical outlets, remove the battery pack, and... the failing FRU.
Verify this by , electrostatic discharge. Lenovo B575
Removing and replacing an FRU
This section presents exploded figures ...
Hardware Maintenance Manual - Page 38
Lenovo B575 Hardware Maintenance Manual
1010 Battery pack
DANGER Only use the battery specified in the locked position.
34 Removal steps of the slot. Holding ... battery pack along the slide rails of battery pack
Unlock the battery release lever a. Any other battery could ignite or explode. Figure 1. Then make sure that the battery release lever is in the parts list for your computer.
Hardware Maintenance Manual - Page 41
.... • Before removing the drive, suggest the customer to physical shock. Lenovo B575
1040 Hard disk drive
For access, remove these FRUs in order: •... (quantity)
Color
M2 × 3 mm, flat-head, nylok-coated (1) White
Torque 1.5 kgfcm
3
When installing: Make sure that the HDD connector is in suspend mode. Figure 4. Improper handling can cause damages and permanent loss of hard ...
Hardware Maintenance Manual - Page 43
... the DIMM firmly, and pivot it until it is used on the computer you are servicing, the card must be moved.
39 Make sure that it snaps into the socket. Lenovo B575
1060 DIMM
For access, remove these FRUs in SLOT-1 ( : upper slot). Removal steps of DIMM Release the two latches on page...
Hardware Maintenance Manual - Page 48
Removal steps of keyboard (continued)
Lift the keyboard a little c, and then detach the connector in the direction shown by arrows d e.
3
4 5
When installing: Make sure that the FPC connector is attached firmly.
44 Lenovo B575 Hardware Maintenance Manual
Figure 8.
