Lenovo MIIX 3-830 Tablet – Disassembling procedure – How to remove the battery – How to test the AC Adapter – Tablet repair and service

Category: Tablet Repair and Service 

Contents of this article 

  • How to test the charger
  • How Remove the battery
  • How to remove the LCD cover 

Lenovo MIIX 3-830 

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”
 “Checking operational charging”
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.
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.
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.
Restore of factory default
The Lenovo MIIX 3-830 computers come with a pre-installed Recovery system. In order to save application files and the initial backed-up files of the system, the hard disk in a Lenovo computer includes a hidden partition when it is shipped. If you need to restore the system to the point of your first boot up, just enter the Recovery System.
How to remove LCD cover
Note: To separate the LCD cover from the tablet, use a prying tool (such as a thin plastic plate).
Insert a prying tool between the base cover and the panel module and slide it around the tablet in the direction shown by arrows 1, 2 and 3 to separate the base cover from the rest of the tablet.

Then carefully remove the LCD cover in the direction shown by arrow 4.
How to remove Battery pack
Note: The battery pack is stuck to the LCD module. To separate the battery and the LCD module, use a piece of strong and thin string (such as fishing line).
Remove the tape that secures the battery connector. Then unplug the battery connector in the direction shown by arrow 1.
Note: Do not use too much force when you disconnect the battery connector, otherwise the connector or the cable may be damaged.
Insert a piece of string between the battery pack and LCD module. (from the right side of the battery).
While Pulling the string with both hands as shown by arrows 2, carefully move the string in the direction shown by arrow 3 to separate the battery from the LCD module.
Attention: The battery pack is thin and easy to distort or wrinkle. Please be careful when you remove it.
Remove the battery pack in the direction shown by arrow 4.