Acer Nitro AN517-51 only charges when off

[DiamondTech61]

Hi, I have an acer nitro 5 that will only charge when powered off. If i plug in a charger when its turned on it works for a few seconds then the chargers protection kicks in and shuts the charger off, I have tested it with 2 chargers. It works perfectly fine off the battery when in use. If I disconnect the battery, the laptop also works fine just off the charger. Can anyone suggest anything? Im guessing if it was a motherboard short then the laptop would not power on at all.

[mon2]

Re: Acer Nitro AN517-51 only charges when off

Are you using the official and recommended power adapter for this model? If the power rating is not enough, the logic board will throttle the speed and/or disable charging when the board is on. Confirm this important detail.

[DiamondTech61]

Re: Acer Nitro AN517-51 only charges when off

no, the only one I have is 120w, would it short out? Its not getting as far as windows so i didnt think it would draw that much current? Ill get a 135w to test just to confirm. I did plud into a bench power supply with an acer dc socket end attached and it went up and down but didnt go over 4.8 amps if thats any help.

[mon2]

Re: Acer Nitro AN517-51 only charges when off

You may have a fault with the DCin mosfets.

Remove all power. Meter in resistance mode.

Check the resistance across the 2 x DCin mosfets.

Source & drain
Source & gate
Gate & drain

Post each measurement.

The 135 watt power adapter is still recommended but do review the above mosfets.

[mcplslg123]

Re: Acer Nitro AN517-51 only charges when off

Battery discharge fet also needs to be checked.

[DiamondTech61]

Re: Acer Nitro AN517-51 only charges when off

hi guys sorry for the late reply, I ended up buying a new charger (the correct one) and its now working perfectly. thanks for all your feedback