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Ok, I will try U1200 first and then if that fails I will try a CPU after. It is worth it because MLB is 64GB ram 2TB SSD. When I have an exact CPU available I will try and report back here with the results. For now I set it aside waiting for the perfect donor. I have only done CPU replacements...

What do you suggest I try next because I already reloaded the OS fresh to make sure not OS software issue.

I tried safe mode and the MacBook boots to OS with internal display.

Prior to asking for help on here, I already DFU restored the machine fully. I did try PRAM as well. Issue persists. I know it's a hardware failure somewhere on the Logic Board, but that is all I know.

This MacBook came from another shop. They said it was showing black screen but when plug in external that the internal video shows. The internal video only shows in OS if you start the machine with the external monitor already plugged in. Once the external is unplugged the internal video goes...

Hi all, I have no idea were to start with this MLB. The issue is, the MacBook will boot to OS and show internal display and external only with external monitor connected. Once the external monitor is unplugged the internal LCD goes out. Basically the MacBook can be used normally if an external...

CRC2018, did this solve your issue with your Board?

I'm pretty sure the CPU was already damaged before, which is why I injected 8V. It was the last resort besides replacing the CPU. Now the CPU is removed. SO what your saying is even though the short is gone right now, when I solder on a known GOOD CPU, PPBUS_HS_CPU will have a short there again...

2informaticos, why do you ask? PM me if you really wanna know. Thank you piernov, I will order some and see how it turns out. Does anyone else know of any good edge glue for BGA chips?

Bump

I have been meaning to attempt this repair, I have a 13" lined up ready to get new flex cables + PCB board soldered on. Have you tried JUST replacing the cables and re-using the original PCB?

Here's a nice picture of the CPU removed, :eek: https://drive.google.com/file/d/1YbGLsc_COUlrVts6ZSNt88_Rj9Cd5CG4/view?usp=sharing

I need to clarify about this repair, when I first started working on it the first thing I did was rule out everything on PPBUS_HS_CPU that could be causing the short besides removing the CPU. Then I injected 8V. I figured that rail was supposed to be around 12V so I started low. That's when the...

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Thanks. I suspected the CPU to be DEAD since U7410 is shorted. If I have the skill to remove the CPU and replace it with a known good one just for learning do you think it has a chance?

Got it. Is this Board trash now 100%? Is just the CPU affected or PCB too? If I didn't inject 8v then what would be the next step?

I'm working on a 2017 820-00928 Logic Board. It was only liquid damaged on U7410. PPBUS_HS_CPU is apparently shorted. I compared it to a known good Logic Board. I attempted injecting 8v on that rail and the CPU gets warm. I suspect BAD CPU or am I overlooking?

Looking for glue that appears the same as the original. All I can find is red and black... Only looking for answers to something that is the same or appear very much alike. Thanks!

I would love to know how to re-apply BGA glue, and where to get it. Can someone PLEASE PM me an answer. I'll make it worth your while I promise!

This 820-00045 won't power on. Under the microscope, I confirmed no liquid/physical damage. This unit died on its own. Under further inspection, I found a short on PPVCC_S0_CPU. When I inject 1V to this shorted line the PCH on the CPU heats up. So I know that the CPU/PCH BGA processor needs to...