Chosen Solution
Prior to repair, I noticed that the battery stayed at 23% charged no matter how long I kept it on the charger. It stayed like that for a few months until it just cut out. It seemed like the battery was the issue. I followed the battery installation instructions on this site and everything seemed to be done properly. However, when I tried to power it back up or plug in the power source, the charge light indicator did not appear and the computer won’t power on. Any other ideas of what it might be?
Did you try completely discharging the old batteries before attempting the repairs? Does or did it work on just the charger with the battery removed? If it didn’t/doesn’t work with the charger alone the charger may be defective. Does the wall power outlet work? Also are you sure you carefully reconnected everything correctly? I would suggest reviewing the battery replacement instructions: Asus ZenBook UX330U Battery Replacement You may have missed or misunderstood a crucial step. Especially recheck all connections. Are you sure you didn’t damage any of the ribbon cables? We all make mistakes or overlook something from time to time. You must have done something incorrectly. Recheck the battery connector again (step 8), especially the metal guard, and the motherboard cable (steps 6 & 7) both ends. These pressure connectors can be tricky to reconnect - “minimal force” being the key words for all but make sure the connection is good. You could also try without re-assembling the case. If that works then it could be exerting pressure somewhere affecting one of the connections. Look for something like a wire or that tape on the bottom right of the right end of motherboard cable. And of course make sure some other connector has not come loose. Myself I use a magnifying glass and excellent lighting when checking a board. Then read over the calibration instructions: Battery Calibration
