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Something something troubleshooting with known good parts before assuming its a board issue... You need to test it with a known good battery and trackpad still.

Wait, you are using a 13" display on a 15" board?? Are you sure that works?

Probably dead cpu.

No, no need to replace Q7706 if it isn't being told to open. Are you testing with a known good 2014 screen and cable (plugged in of course)? R7757/R7758 ok?

Plug in a charged battery and use an 85w charger.

Check for shorts on s3 and s0 rails.

Is the screen white or black?

Does it say battery is not charging? Or does it say fully charged?

Yes, fix the trace.

I don't know how many other ways there are to tell you the same thing. Either you are using your multimeter incorrectly or you're looking at the wrong thing on the board. Look at the schematic and find the two current sensing circuits, CSI and CSO. Trace them out and back into the ISL with your...

What happens when it reaches 53%?

https://youtu.be/hpbzO2UjQQA

Fan spins? Do you get a light on the USB mouse?

Find the short on PP5VR3V3_SW_LCD, there are only like 5 components on that line.

Did you replace u5110 first and remove jtag connector? Voltage on PPBUS_G3H?

Replaced IO board and flex yet?

Throw it in the trash.

:(:( OL is open line, the exact opposite of no resistance. Check all the resistors between those pins and check continuity between them.

Dead ISL6259 buck killed switching mosfets. Compare resistance to ground on PPBUS_G3H with known good and make sure that it isn't partially short, then if it's ok replace Q7030 and Q7035 for good measure.

Resistance between pins 17 and 18 of U7000? Also pins 27 and 28?