I can only suggest that you open the laptop and start checking the voltages in the battery charge circuit.
If the motherboard is model number NM-B521 (printed on the board) then here's the [document|31821|schematic] for the board that will help.
Go to p.70 to view the battery charging circuit. Unfortunately I cannot find a board layout diagram as presumably a lot of the components shown in the schematic will not be designated on the board as is usually the case these days. Hopefully the major ones are at least.
If you find a faulty component then the component model information is shown in the schematic along with the board designator for the component. Apologies if you knew this already.
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Here's the [link|https://download.lenovo.com/pccbbs/mobiles_pdf/tp_x280_hmm_en.pdf|hardware maintenance manual] as well which details he procedures to disassemble and remove most everything from the laptop, which may also help.
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Here's the [link|https://download.lenovo.com/pccbbs/mobiles_pdf/tp_x280_hmm_en.pdf|hardware maintenance manual] as well which details the procedures to disassemble and remove most everything from the laptop, which may also help.
I can only suggest that you open the laptop and start checking the voltages in the battery charge circuit.
If the motherboard is model number NM-B521 (printed on the board) then here's the [document|31821|schematic] for the board that will help.
-
Go to p.70 to view the battery charging circuit. Unfortunately I cannot find a board layout diagram as presumably a lot of the components shown in the schematic will not be designated on the board as is usual these days. Hopefully the major ones are at least.
+
Go to p.70 to view the battery charging circuit. Unfortunately I cannot find a board layout diagram as presumably a lot of the components shown in the schematic will not be designated on the board as is usually the case these days. Hopefully the major ones are at least.
If you find a faulty component then the component model information is shown in the schematic along with the board designator for the component. Apologies if you knew this already.
-
Here's the [https://download.lenovo.com/pccbbs/mobiles_pdf/tp_x280_hmm_en.pdf|hardware maintenance manual] as well which details he procedures to disassemble and remove most everything from the laptop, which may also help.
+
Here's the [link|https://download.lenovo.com/pccbbs/mobiles_pdf/tp_x280_hmm_en.pdf|hardware maintenance manual] as well which details he procedures to disassemble and remove most everything from the laptop, which may also help.
Hi @johnbunney
I can only suggest that you open the laptop and start checking the voltages in the battery charge circuit.
If the motherboard is model number NM-B521 (printed on the board) then here's the [document|31821|schematic] for the board that will help.
Go to p.70 to view the battery charging circuit. Unfortunately I cannot find a board layout diagram as presumably a lot of the components shown in the schematic will not be designated on the board as is usual these days. Hopefully the major ones are at least.
If you find a faulty component then the component model information is shown in the schematic along with the board designator for the component. Apologies if you knew this already.
Here's the [https://download.lenovo.com/pccbbs/mobiles_pdf/tp_x280_hmm_en.pdf|hardware maintenance manual] as well which details he procedures to disassemble and remove most everything from the laptop, which may also help.