Hi,
This Macbook came in for display replacement but had corrosion around U9080. I advised the customer but they did not want to pay for motherboard work... unfortunately at the time I was unaware of this common issue. Laptop returned after two weeks with no boot. PPBUS_G3H_SSD0_SND and PP2V5_NAND_SSD0 were shorted. When I removed U9800 the short was gone. I replaced U9080 and still no short.
At first boot attempt I got 20V and heard the startup chime, no apple logo but saw the current draw exceeding 3A and I turned off power.
I tried to boot without the battery and the current draw didn't exceed 2.5A so I assume the battery was charging as the reason for the > 3A draw.
The laptop seems to boot but with no display, nothing external either. I see the "esc" light up on the touch bar, caps lock lights when I press it, I hear the voiceover come on when I press the power button 3 times and I'm able to navigate a bit by tapping the touchpad with 3 fingers and using the arrow buttons. I was able to shut down this way.
I'm thinking that since the voiceover works then the NAND are good?
I have not tried SMC or PRAM reset, safe mode yet. For now I just wanted to get an opinion about the NAND from the more experienced persons on the forum, I read on another thread that if the caps lock lights then the OS has booted. TIA
Reason for reposting - I thought the title could be better, sorry if I made any violations. Admins please delete the previous thread I created for this.
This Macbook came in for display replacement but had corrosion around U9080. I advised the customer but they did not want to pay for motherboard work... unfortunately at the time I was unaware of this common issue. Laptop returned after two weeks with no boot. PPBUS_G3H_SSD0_SND and PP2V5_NAND_SSD0 were shorted. When I removed U9800 the short was gone. I replaced U9080 and still no short.
At first boot attempt I got 20V and heard the startup chime, no apple logo but saw the current draw exceeding 3A and I turned off power.
I tried to boot without the battery and the current draw didn't exceed 2.5A so I assume the battery was charging as the reason for the > 3A draw.
The laptop seems to boot but with no display, nothing external either. I see the "esc" light up on the touch bar, caps lock lights when I press it, I hear the voiceover come on when I press the power button 3 times and I'm able to navigate a bit by tapping the touchpad with 3 fingers and using the arrow buttons. I was able to shut down this way.
I'm thinking that since the voiceover works then the NAND are good?
I have not tried SMC or PRAM reset, safe mode yet. For now I just wanted to get an opinion about the NAND from the more experienced persons on the forum, I read on another thread that if the caps lock lights then the OS has booted. TIA
Reason for reposting - I thought the title could be better, sorry if I made any violations. Admins please delete the previous thread I created for this.
O.k. then… unplug the power supply from the main board and put in a full size ATX PSU (yeeeesss! Exact that blown Powerman IP that I fixed a while back), plug it in and the old...