If your ROG Ally stopped charging after a hardware update, try these steps:Check Charger and Cable: Ensure they are undamaged and properly connected.Perform EC Reset: Disconnect power, hold the power button for 40 seconds, then reconnect.Update BIOS:...

I have bought some replacement parts from ajparts.co.uk You can check this out.

You can refer this https://youtu.be/aRCeVB9rSNU

Try a hard reset: hold the power button for 40 seconds, then reconnect the power and try to boot again. If it doesn't work, contact ASUS support.https://youtu.be/7-LvlTOA9Ho 

Check Connections: Ensure all power cables are securely connected.Clear CMOS: Reset the BIOS by removing the CMOS battery or using the jumper.Minimal Boot: Boot with only the CPU and one RAM stick.Inspect for Damage: Look for any visible damage on th...