Lenovo Yoga 2-1051 (English) Hardware Maintenance Manual - Yoga Tablet 2 1051F - Page 25

Power system checkout, Checking the Computer AC Charger

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General checkout 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 computer. 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 cable. Refer to the following figure: 1 2 3 (5V) Pin Voltage (V dc) 1 Ground 2 0 3 +5 Note: The output voltage across pin 3 of the micro-B connector might be different from the one you are servicing. 3. If the voltage is not correct, replace the micro-USB cable. 4. If the voltage is acceptable, replace the system board. 21

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General checkout
21
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
computer.
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
cable. Refer to the following figure:
Note:
The output voltage across pin 3 of the micro-B connector might be
different from the one you are servicing.
3.
If the voltage is not correct, replace the micro-USB cable.
4.
If the voltage is acceptable, replace the system board.
Power system checkout
Pin
Volta
g
e (V dc)
1
Ground
2
0
3
+5
12
3 (5V)