Thursday, March 03, 2016

Lenovo laptop - LENOVO IDEA TAB YOGA 13 - Battery charge (AC Adaptor testing) – How to check the battery pack – Password – YOGA 13 Disassembling procedure – Laptop repair and service

Category: Laptop repair and Service 

Contents of this article 

  • How to check the charging adapter 
  • How to check the battery 
  • Disassembling procedure 


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:

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 persists.
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.
Perform operational charging. If the battery status indicator or icon does not light on, remove the battery pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon is still off, replace the battery pack.
If the charge indicator still does not light on, replace the system board. Then reinstall the battery pack. If it is still not charged, go to the next section.
Checking the battery pack
Battery charging does not start until the Power Meter shows that less than 95% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life.
To check your battery, move your cursor to the Power Meter icon in the icon tray of the Windows taskbar and wait for a moment (but do not click it), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the Power Meter icon.
Note: If the battery pack becomes hot, it may not be able to be charged. Remove it from the computer and leave it at room temperature for a while. After it cools down, reinstall and recharge it.
Power-on password
A power-on password (POP) protects the system from being powered on by an unauthorized person. The password must be entered before an operating system can be booted.
Hard-disk password
There are two hard-disk passwords (HDPs):
+ User HDP - for the user
+ Master HDP - for the system administrator, who can use it to get access to the hard disk drive even if the user has changed the user HDP
Supervisor password
A supervisor password (SVP) protects the system information stored in the BIOS Setup Utility. The user must enter the SVP in order to get access to the BIOS Setup Utility and change the system configuration.
Removal steps of keyboard
Loosen the keyboard with a flat blade in the direction shown by arrow 1 . Lift the keyboard a little in the direction as shown by arrow 2 .

Lift the keyboard a little 3 , and then detach the connector in the direction shown by arrows 4,5.
When installing: Make sure that the FPC connector is attached firmly.
Keyboard bezel
Removal steps of keyboard bezel
Remove two screws 1 three screws 2 and ten screws 3 on the bottom.

Unplug the power board connector in the direction shown by arrow 4 , detach the touchpad connector in the direction shown by arrows 5,6
When installing: Make sure that the power board connector and touchpad cable are attached firmly.
Remove the keyboard bezel in the direction shown by arrow 7..