Lenovo G50-80 Auto Power On when AC is detected

[classicandy]

Hi Everyone,

I have a Lenovo G50-80 that auto powers On when AC (Charger) is connected. I have checked the BIOS settings and there is no option to turn On or Off that feature as it is in some HP EliteBooks. I did update the BIOS and still same.

I then flashed the BIOS with a different bin file I downloaded here, It worked (didn't auto power on) for some time (after testing up to 5 times) but has now started again to auto power on when AC is connected.

The CMOS battery voltage is 3v. I have also tested with two main batteries as well. I would be glad if anyone can point me in the right direction.

Thanks.

[mon2]

Link the schematics if available but only if they are in the dedicated schematic forum.

Review the DCin mosfets in the power path from the AC charger connector to the main voltage rail on the logic board. These DCin mosfets will be enabled / disabled by the charger IC.

[classicandy]

Link the schematics if available but only if they are in the dedicated schematic forum.

Review the DCin mosfets in the power path from the AC charger connector to the main voltage rail on the logic board. These DCin mosfets will be enabled / disabled by the charger IC.

Thanks

Schematics --- >>> https://www.badcaps.net/forum/troubl...38#post1172438

Boardview --- >>> https://www.badcaps.net/forum/troubl...03#post1626803


Will check those MOSFETs

[classicandy]

Link the schematics if available but only if they are in the dedicated schematic forum.

Review the DCin mosfets in the power path from the AC charger connector to the main voltage rail on the logic board. These DCin mosfets will be enabled / disabled by the charger IC.

I have solved it. It was a very minor problem. It turned out to be the keyboard that was causing it. I was able to figure out that it was the NUM_LOCK Led that was bad and somehow causing a short or something. Anyways, I just insulated the pins for the NUM_LOCK Led (Pins 29 and 30) on the keyboard flex since the keyboard itself is still working (all keys are functioning perfectly).

In case of anyone that encounters something like this for this particular model, try checking with another keyboard and if all the keys on your keyboard are still ok and you don't want to replace the keyboard, then do well to check the CAPSLOCK Led and NUM_LOCK Led because they connect to +3VS. In my case, it was NUM_LOCK Led.

I hope this helps. Cheers

[mon2]

Well done. Thanks for posting the resolution.