Lenovo U41-70 Laptop Hardware Maintenance Manual - Lenovo S41-70, U41-70 - Page 26

If the charge indicator is still not lit, replace the system board.

Page 26 highlights

Lenovo S41/U41 Hardware Maintenance Manual Perform operational charging. If the battery status indicator or icon is not lit, 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 is still not lit, replace the system board. 22

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22
Lenovo S41/U41 Hardware Maintenance Manual
Perform operational charging. If the battery status indicator or icon is not lit,
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 is still not lit, replace the system board.