My job is not to find and give u the correct answers, my support here is to make u THINK so u can do your own research from the pointers I give you. If u don't have a board& schematics, then you need to google, check dr bios forum for that, and watch youtube and try to find it etc if u don't understand BIOS pins and working conditions, voltages and how to use an oscilloscope then google, research Dr bios and try to find those answers... That's how I did it, and that's how I do every day... That's how we all do and that's how we learn.. It's not my job to do that for you, right?
revert back here after you have done your research, follow the steps I wrote earlier etc..
for example, have u googled:
HP showing 255% (if so, what did u find?)
Do you know how to use a multimeter when troubleshooting?
Do you know how to troubleshoot the working conditions of charging ic? What steps to follow 1, 2, 3 etc.. Vcc, En, 3v ldo, vref etc?
if u don't know this stuff, then google and watch dr bios videos to learn those things first.
The issue might even be with the SMC/ super IO
if dr bios dont have schematics, u can check
vinafix.com, and
https://www.badcaps.net/forum/index.php