IPad not charging enough to turn on

First of all, thanks a lot for sharing your ideas with me.

The IPad was powering up before the screen replacement. The first battery connector broke by doing so, so I had to change it. As i said before the connection between the new battery connector and the logic board now seems to be fine. The battery connector pins are not shorted or bridged. The screen visualizes that the IPad is charging but there is no progression even if i let it charge for 24 hours.

So i assume that the missing resistor is causing the problem of not powering on (maybe?). Where did you get this information from? Im not able to find anything referring to schematics or parts on the logic board. Do you think its possible to replace this one and how do I get to know which specific resistor is missing here?

@alex_bdg Sorry for the delay in response, been a bit busy and just now remembered to come back to this. I think it's logical that the NTC resistor being missing is a viable solution for non boot. Based on some data sheets for other charging chips I have seen, an NTC resistor needs to be present for the system to recognize there is a battery connected. And iPads will not boot without a battery.

The schematics and other info I have for this particular model are part of a subscription repair database (akin to ZXW). It's called XinZhiZao. I have noticed it tends to have some information that isn't present in other places for some reason. Even so, there is a bit of critical thinking that needs to be done, as iPads still have less data available and and board views are generally less well or accurately labelled. But, it's better than nothing.

More specifically the schematic I have says it's an NTC thermistor (which is a bit different than a standard resistor) at 10K ohm in a 0201 package.

@flannelist Thank you for your advise, I truly appreciate your help. Im gonna try to replace the ntc, hoping im not gonna mess it up :'). Gonna tell you if it worked.

Other question: Do your schematics say something about the 4 pads above (highlighted in the pictures I posted)? Is there something missing or is this normal?

@alex_bdg Looks like those 2 components would be part of a small a debugging circuit for main power. The larger of the 2 components would have been an LED for VCC Main. So it would have been used for testing during the design or manufacture process, but not present on the finalized board.

@flannelist Sorry for the delayed response but I just wanted to say that your advice considering a missing ntc thermistor was very helpful. I soldered the 10k ohm smd ntc thermistor successfully to the motherboard (a few months ago) but it was quite tricky because of its size :'). I would have never thought that the soldering process would turn out well but my IPad is charging like before. Thanks a lot for helping me figuring out how to fix this issue :D.