Friday, June 24, 2016
Lenovo ThinkPad T440s – Business Ultabook laptop - AC adapter Voltage testing procedure – Backup battery testing – Back cover removal To replace the built in battery - Key board removal – Diagnostic program - Laptop repair and service
Category: Laptop repair and Service
Contents of this article
- How to run Diagnostic program
- How to test the AC adapter
- How to teat RTC battery
Lenovo ThinkPad T440s
Power system checkout
To verify if a battery pack or an ac power adapter is functional, do the following:
1. Turn off the computer.
2. Connect the ac power adapter.
3. Turn on the computer. If the computer can be turned on, it means that either the battery pack or the ac power adapter is functional.
4. Insert a straightened paper clip into the emergency reset hole to reset the computer. If the computer is still powered on, it means that the ac power adapter is functional.
5. Turn off the computer.
6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it means that the battery pack is functional.
To verify if a battery pack or an ac power adapter is functional, do the following:
1. Turn off the computer.
2. Connect the ac power adapter.
3. Turn on the computer. If the computer can be turned on, it means that either the battery pack or the ac power adapter is functional.
4. Insert a straightened paper clip into the emergency reset hole to reset the computer. If the computer is still powered on, it means that the ac power adapter is functional.
5. Turn off the computer.
6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it means that the battery pack is functional.
Checking the ac power adapter
You are here because the computer fails only when the ac power adapter is used.
# If the power problem occurs only when the docking station or the port replicator is used, replace the docking station or the port replicator.
# If the system status indicator does not blink three times when an ac power source is connected, check the power cord of the ac power adapter for correct continuity and installation.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage at the plug of the ac power adapter cable. See the following illustration:
You are here because the computer fails only when the ac power adapter is used.
# If the power problem occurs only when the docking station or the port replicator is used, replace the docking station or the port replicator.
# If the system status indicator does not blink three times when an ac power source is connected, check the power cord of the ac power adapter for correct continuity and installation.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage at the plug of the ac power adapter cable. See the following illustration:
Note: Output voltage of pin 2 of the ac power adapter might differ from the one you are servicing.
3. If the voltage is not correct, replace the ac power adapter.
4. If the voltage is acceptable, replace the system board.
Note: Noise from the ac power adapter does not always indicate a defect.
4. If the voltage is acceptable, replace the system board.
Note: Noise from the ac power adapter does not always indicate a defect.
Checking the battery and operational charging
To check for detailed battery status information, do the following:
#For 7: Open the Power Manager program and click the Battery tab.
# For 8 and 8.1: Open the Lenovo Settings program and click Power.
To check whether the battery charges properly during operation, do the following:
1. Discharge the battery until the remained battery power is less than 50%.
To check for detailed battery status information, do the following:
#For 7: Open the Power Manager program and click the Battery tab.
# For 8 and 8.1: Open the Lenovo Settings program and click Power.
To check whether the battery charges properly during operation, do the following:
1. Discharge the battery until the remained battery power is less than 50%.
2. Connect the computer to ac power to charge the battery. If the battery status icon in the Windows notification area indicates that the battery is not charging, remove the battery and let it return to room temperature.
3. Reinstall the battery. If the battery is still not charging, replace the battery pack.
4. Check the battery status icon again. If the same error still exists, replace the system board.
3. Reinstall the battery. If the battery is still not charging, replace the battery pack.
4. Check the battery status icon again. If the same error still exists, replace the system board.
Checking the coin-cell battery
To check the coin-cell battery, do the following:
1. Disable the built-in battery.
2. Remove the coin-cell battery.
3. Measure the voltage of the coin-cell battery. See the following illustration.
To check the coin-cell battery, do the following:
1. Disable the built-in battery.
2. Remove the coin-cell battery.
3. Measure the voltage of the coin-cell battery. See the following illustration.
# If the voltage is correct, replace the system board.
# If the voltage is not correct, replace the coin-cell battery.
# If the coin-cell battery discharges quickly after replacement, replace the system board.
# If the coin-cell battery discharges quickly after replacement, replace the system board.
Disabling the built-in battery
Before replacing any FRU, ensure that you have disabled the built-in battery by doing the following:
1. Disconnect the ac power adapter and all cables from the computer.
2. Restart the computer. When the ThinkPad logo is displayed, press F1 to start the ThinkPad Setup program.
3. Go to Config > Power > Disable built-in battery.
4. Press Enter. A Setup Confirmation window is displayed.
5. Select Yes in the Setup Confirmation window. The built-in battery is disabled and the computer turns off automatically. Wait three to five minutes to let the computer cool.
Before replacing any FRU, ensure that you have disabled the built-in battery by doing the following:
1. Disconnect the ac power adapter and all cables from the computer.
2. Restart the computer. When the ThinkPad logo is displayed, press F1 to start the ThinkPad Setup program.
3. Go to Config > Power > Disable built-in battery.
4. Press Enter. A Setup Confirmation window is displayed.
5. Select Yes in the Setup Confirmation window. The built-in battery is disabled and the computer turns off automatically. Wait three to five minutes to let the computer cool.
DISASSEMBLING PROCEDURE
How to remove Base cover
Remove the external battery
Loosen the screws 1 in ascending alphabetical order (a to h) as illustrated.
Pry up the latches 2 in ascending alphabetical order (a to h) as illustrated, and then remove the base cover.
How to remove Keyboard
1. Use the flat end of the multi-tool to remove the rubber stoppers. If your computer does not have the rubber stoppers, ignore this step.
2. To reveal the screw heads beneath the frame, use the flat end of the multi-tool in the shipping package of the new keyboard to slide the keyboard forward by 2.5 mm (0.1 inch).
Note: Do not press and hold the keys while sliding the keyboard frame, otherwise the keyboard frame cannot be moved.
3. Use the cross end of the multi-tool to loosen the screws.
4. Slide the keyboard to the direction of arrow 4.
5. Remove the keyboard in the direction arrow 5.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment