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So i got a adapter now and tested it with an external monitor. It's getting always harder to boot (more attempts needed) and most of the times it boots with full fan spin and no display and no backlight- independent from trying it with external monitor or without ?

I have tried it already with all batteries for 15" MBP i got ? Known good original ones and new third party ones. PM_BATLOW_L is still missing ? Okay, that is good to know, thank you ? Will try to avoid it in future ?

Maybe also interesting: Battery is only charging when i connect the battery first. On other boards the battery is also charging when I connect the battery after the magsafe.

So I just looked again at this problem (with a new battery and still not powering on) and measured the RTC signals again: RTC_RESET_L: 3.30V PCH_SRTCRST_L: 3.30V PCH_INTRUDER_L: 3.05V <---- seems not stable... slowly decreasing. PCH_INTVRMEN_L: 3.25V <---- seems not stable... slowly decreasing...

But it seems not to boot when it shows black screen. Bo USB activity and no light when pressing the shift key

Can test it on monday. Have to wait for the delivery of an USB-C adapter. What do you expect to see on the external screen? If it boots normally on the external?

Hello again ? I think i just have another Memory issue. The MBP boots completly after trying it many attempts. It powers on but there is no backlight or display. When it is able to boot it crashes after few minutes (see picture) freezing and faulty display. So i think it is the VRAM, am i...

I soldered the memory chips back on. Only got fan spin - no display and no usb activity. So I think you were right and the cpu is gone ?

I just spent so much time for this so I will try it ;-) At least I got a fanspin now (without RAM). Is there a possibility to check if the CPU is working before soldering the RAM? I dont think so :-D

So just reballed 32 RAM chips... :-D Should I check the RAM power supply voltage before soldering them back on? I'm afraid burning the new ones :-D

So the second one i marked with a red arrow are the faulty ones from the original board (H5TC4G83AFR-PBA) and the first marked is the chip model from the donor board. Should be fine?

What are the spects I do have to pay attention to? Thank you :-)

Is it normal that this MBP only powering on with a battery connected? Got several MBP from 2009/2010 not powering on without battery.

Unfortunately no luck :-(

I got a set of chips from a 2013 15" macbook pro. May I use them?

So now I got 27 chips with very low resistance (<5 Ω) between GND and Power supply, 1 with 100 Ω, 2 with 4 kΩ and 2 with 0.5 kΩ. I'm confused... are they all bad?

So one memory Chip was left when the short to ground disappeared. Seems like most of the Memory Chips are faulty - 4 Ω between Pins 2 and 7. I compared it to a known good one - this one had 500 Ω. Or did i maka a wrong measurement? What could cause 16 Memory chips to get faulty?

I managed to get a IR-camera and took a closer look on the RAM chips. The picture is a little bit misaligned so the thermal image is moved to the right. As feared I see no temperature peak here. But some of the chips are not getting warm at all. Any assessment?

No, nothing.

So dead CPU? :-(