my lenovo thinkpad T440p laptop is not working pluged saying "your connected ac adapter has a lower wattage of less than 65 " and after changing the charger with the chager of the type of the computer it shows the same message and not work what should i do
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There's a sense lead on pin 5 of the DC-In jack that is used to determine the type of charger that is connected to the laptop.
Use a strong light and a magnifying glass and check that all the pins in the charge port are OK and are not bent, broken or missing, especially pin 5.
If the input side of the charge port looks OK, remove the battery from the laptop and then open the laptop and disconnect the DC-In cable from the motherboard only. At this stage you don't have to remove it any further from the laptop.
Here's the hardware maintenance manual for the laptop that will help.
Go to p.89 (p.95 of 108 pdf) to view the procedure to remove/replace the DC-in cable.
Use a DMM's (digital multimeter) Ohmmeter function and test the wire from pin 5 of the DC In jack to the white wire on the DC-In cable plug for continuity.
If the wire is open circuit, replace the DC-In cable. Search online for any of the following 3 part numbers as they are all for DC-In cables that are compatible with the laptop.
04X5405, 00HT098, 04X5404.
If the wire tests OK, then here's the schematics for the motherboard. Go to p.73 and follow the wire from pin 5 of the DC-In cable plug connector on the motherboard to the resistor PR1911, prove that the resistor is not open circuit then follow the ACDC_ID lead to p.62 and check if 750 Ohm resistor R258 is OK.
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Is the charger you're using the charger than came with the laptop originally?
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