iPhone X upper board shorted

Exactly. 180 degree is not hot enough to melt the chips, that’s why I am confused. Actually all the lines mentioned earlier are indeed shorted. Resistance values read 0 to 1 Ohms on both ends of capacitors on these lines. I already removed and reballed the WiFi chip. But since the top board is dead, there is no point to bond two boards together. Top board on its own should be able to power up without the lower board, but it’s dead at the moment. Something must be disturbed when I accidentally dropped the upper board while it’s very hot, but I don’t know where to start. Freeze spray didn’t help. :(

I wish you luck. The only time I have seen these lines shorted is after I re-balled the CPU. When you get some time I would put some leaded solder wire on your heater to check its calibration.

Thanks. Do you remember in your case what caused the short and how did you fix the short at the end?

@phonestore.uk It was a data recovery job. They microwaved there phone after it got submerged in water. I had to do a CPU swap, after the first attempt I had a number of shorts from the balls bridging under the CPU. It took four attempts of removing and re-balling before I could relieve them. I am not saying you have the same problem but some of the lines you mentioned where shorted after I replaced the CPU. For all those lines to be affected you would have to presume it is CPU or PMIC I think one of the lines I could remove a coil to find out which side was shorted which led to the CPU the one that led to the PMIC was then all right.