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Good chance U5110 is bad. However, SMC_RESET_L should be 3.3v at least, not 3.0v. That is worrisome.

The stencil sticks to the SMC. When you're done, remove the tape, add some flux, heat it at full air with the nozzle further away, and have your tweezers under the stencil. I pop it off that way. The key is to do it in the moment while the balls are slightly expanded down but not fully melted...

Have you confirmed with a known good LCD that this still happens? Also the LCD in these has a 5v and a 3.3v power rail, unlike the old ones that only had 5v, or 3.3v exclusively. When this occurs, are you missing power on one, neither, or both? 99% chance it is the LCD. If it managed to blow...

If you had 12.23v before replacing the ISL and have half a volt after then it is clear that something happened there. Either bad ISL or bad soldering. The original issue was bad communication between the SMC and the battery. This is caused by bad pullup resistors, bad SMC, or something on the...

1) Is PP3V42_G3H present? 2) What is the resistance to ground on PPBUS_G3H? 3) What is the resistance between pins 17/18 of U7100? 4) What is the resistance between pins 27/28 of U7100?

If R7010 is hot enough to burn you then the most likely case is that PP3V42_G3H is missing as this is part of the circuit for the PP3V42_G3H power supply. PP3V42_G3H is the first rail that must show up before PPBUS_G3H is present. So my first question would be, do you have a short to ground...

SMC_PM_G2_EN not being present, if SMC_RESET_L is present, is a sign of 1) A dead SMC. 2) U7501 shorting SMC_PM_G2_EN to ground. My bet is on the SMC. On the other hand, SMC_PM_G2_EN missing should NOT result in 1v - or any voltage - on PP3V3_S5. You should have 0v there. So, now I imagine...

Can you use a decimal point instead of a comma for voltages? You're making my eyes bleed reading that. It seems like there is a short circuit on PP3V42_G3H. This will be difficult to find because at 124 ohms it will only use up something like 0.1 watts which will produce virtually no heat at...

1) Resistance between pins 17/18 of U7000, and 27/28 of U7000? 2) Is there a short on any S0 rail(do not call vcore a short)? PP5V_S0, PP3V3_S0, etc. vcore should pulse with fan spin so its lack of pulsing is a bad sign.

Which were they? This is our only hint to go on, so we need it! Is PP3V3_S5 present? PP5V_S5 present? PPVRTC_G3H present? Where was the corrosion?

Bad GPU, no surprise there. These aren't available in new/good order.

First obvious one is making sure SMC_LID is 3.4v throughout this process. Next, U9150 deals with eDP MUX, and eDP is what matters since this is what is going to the screen. I would be curious what LCD_MUX_EN and LCD_MUX_SEL are going to U9150 on your defective board vs. a known good. An...

That sounds fine. Are you getting 12.56v on PPBUS_G3H after replacing the ISL6259?

I still think you should put effort into finding a suitable replacement cap, but I suppose this can be considered solved now.

Reballing the existing bad SMC will not fix it, it is like kicking a dead employee and asking him to work. Get a new SMC, the same way if your employee died you would find a new one..

area above CPU = near the SMC. Check all your traces and components in that area again, and replace the SMC after is what I'd say.

This is odd. Typically this is a logical problem or a power problem. A logical problem is that the SMC is unable to communicate with the battery - it doesn't see the battery due to a short on a data line, or the SMC is dead. That does not appear to be the case because PPBUS_G3H is the proper...

SMC is bad. Reflow to see if that fixes, if not then replace. 12.23v PPBUS_G3H means it is not communicating with the ISL6259. When the SMC is communicating with the ISL6259 PPBUS_G3H will be 12.56v. The SMC is also responsible for the green light, as SYS_ONEWIRE is the data line upon which it...

You likely still have a short circuit. What is the resistance to ground on PPBUS_G3H now?

1) What voltage is PPBUS_G3H with charger connected, battery NOT connected? 2) What is diode mode to ground on pin 2 of R5280, R5281? Red probe on ground, black probe on pin 2. Make these two measurements without power connected. 3) What is the resistance between pins 17/18 of U7000? Make these...