Power System Checkout; Checking The Computer Ac Charger - Lenovo YOGA Tablet 2-851F Hardware Maintenance Manual

Power system checkout

To verify a symptom, follow the steps below:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the AC adapter.
4. Make sure that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the AC adapter and install the charged battery pack.
7. Make sure that the battery pack supplies power when you turn on the
If you suspect a power problem, see the appropriate one of the following power
supply checkouts:
• "Checking the Computer AC Charger" on page 21
• "Checking the internal battery status" on page 22

Checking the Computer AC Charger

When you use the computer AC Charger to charge the tablet but no power is
charged, see the instructions in this topic to check the computer AC Charger.
To check the computer AC Charger, do the following:
1. Disconnect the micro-USB cable from the tablet.
2. Measure the output voltage across the connector marked B of the micro-USB
3. If the voltage is not correct, replace the micro-USB cable.
4. If the voltage is acceptable, replace the system board.
computer.
cable. Refer to the following figure:
1 2 3 (5V)
Note: The output voltage across pin 3 of the micro-B connector might be
different from the one you are servicing.
Pin Voltage (V dc)
1 Ground
2 0
3 +5
General checkout
21