Lenovo 21D8 Hardware Maintenance Manual page 32

• 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.
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ThinkPad P15v Gen 3 and ThinkPad T15p Gen 3 Hardware Maintenance Manual
Wire Voltage (V dc)
Red +2.5 to +3.2
Black Ground