Wednesday, March 04, 2015




Important notice for replacing a system board
Some components mounted on a system board are very sensitive. Improper handling can cause damage to those components, and may cause a system malfunction.
Attention: When handling a system board:
• Do not drop the system board or apply any excessive force to it.
• Avoid rough handling of any kind.
• Avoid bending the system board and hard pushing to prevent cracking at each BGA (Ball Grid Array) chipset
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.
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.
To check the battery pack, follow the steps below:
1. Turn off the computer.
2. Remove the battery pack and measure the voltage between battery terminals
1 (+) and 7 (-). See the following figure:

3. If the voltage is less than +11.0 V DC, the battery pack has been discharged.
Note: Recharging will be continued for at least 3 hours, even though the indicator does not light on.
If the voltage is still less than +11.0 V DC after recharging, replace the battery.
4. If the voltage is more than +11.0 V DC, measure the resistance between battery terminals 5 and 7. The resistance must be 4 to 30 KOHM. If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board.

1. Pull out the SIM card slot cover with a fingertip in the direction shown by the arrow 1

2. Open the back cover along the device frame with a flat blade in the direction shown by arrows 2  Lift the back cover in the direction shown by the arrow 3

3. Disconnect the battery connector 1 then remove the battery by holding the right edge of the battery pack in the direction shown by the arrow.

Detach the back camera connector 1 and remove it.

1. Detach Switch board FPC connector 1.

2. Remove the three screws 2.

3. Detach Volume FFC connector 3 , LVDS cable connector 4 , Touch FPC connector 5, and Speaker connector 6

4. .Lift the system board in the direction shown by arrow 7 . Disconnect the Vibrator motor connector 8 . Then remove the system board.

Remove the eleven screws 1.

Remove the left speaker module 2, and volume board 7 . Be sure to disconnect the connector at the back. Peel off the right speaker module 3. Remove the Dock hooks 4 and 6 , then switch board 5 .