iPad 5 Not Charging

I had a customer bring me an iPad 5 that doesn’t charge. I managed to get it to charge at 1amp sometimes but most times it charges at 0amps…

I checked vchargr and it was showing 4.2volts.. I changed Tristar and now the line shows 5 volt and I also changed charge flex and that didn’t do anything either…. So I tested vbatt on battery connector while plugged in and it shows 1.4 volts instead of 3.7 volts. I looked at a schematic board view for an iPad Air and they are totally different…

I plugged cable in without battery and the amperage goes to about 0.12 amps 0.15amps 0 then moves around but when I plugged battery back in and it boots, it goes back to 0 amps…

Did I install Tristar wrong or is something on vbatt line bringing the voltage down.. When the iPad boots, an I have cable plugged in, it says unlock device to use accessory then starts charging at 0.5amps which should be 2 amps…