Changed the screen on 3 of these. Now none will charge.

I have read all the relevant posts associated with this problem. I'm Thinking that I blew one of the resistors near the battery port, but unsure of which one or how. I've checked them all through a great magnifying lens and can see that they are all there and seated properly. Could one of them have possibly blown from the ipad turning on without the lcd or digitizer?

Is it possible that I missed a step to not get it to charge? Maybe, but don't know what step. Or, what step could possibly cause this issue.

I have read that I can jump the resistor, but need to have a decent idea which one it is.

Basically looking for some advice from people with more experience at this than I have. Does anyone have any advice on this?