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I get .5 @ PP3V3_S5 So looks like I may need to backtrack to see what is pulling it down?

Sorry, I did test the lines (including for 5V_S5) leading up to the J4800 pin 14 which I meant to convey the proper voltage was making it that far. I do get .15v from 3V3_SUS, which I would assume is too low. Where should I check, or what should I do next?

I get all power rails only up to PP5V_S4RS3. I do have 5V on pin 14 for J4800. Does this board need the keyboard/trackpad plugged in to make the rest of the rails work? I have replaced many things so far, I don't have the complete list, but the board history is this was a parts board which did...

I got it working, thank you very much. I ended up replacing U8000, and I looked at the trackpad connector on the motherboard, and the metal contacts on the exterior of the connector, the plastic ended up needing to be scraped away with tweezers. After this, I hooked it all back up and it was all...

From the start with the external display? No. I apologize for my ignorance, but I read your article on this located here: https://boards.rossmanngroup.com/threads/how-to-collection.60974/ and I am just a little confused. You said to touch any metal plate. Does this mean I can take any...

Correct, battery must be connected or it won't turn on. Correct. I get both of these with no problem. The trackpad cable makes no difference if it is plugged in or not, so no change. I just did a bit more troubleshooting, and the external video does work fine, I placed the motherboard in with...

Okay, new development. When I tried with the 85w MagSafe, it actually came on. I am having problems now though with the keyboard and trackpad not working. Also the battery is charged up, but the computer will only power on with the Magsafe. I can now use the 60w Magsafe now every time. I do have...

Yes, I plug it in and it goes from green to amber like normal without the battery. I have been using the 60watt MagSafe 2, I have not tried the 85w. Yes I have been testing the board alone. I have been able to reset the SMC. I will check out the other things and post my findings on those, thank you.

Board 820-4924 is back, the issue before was the computer ran super slow, that is until you guys told me to remove pins 9/8 on J4002 (camera sensor issue). This did fix that problem, but now the board is back for not powering on. C7500 on pin 1 is 12.57v I could be wrong, but isn't it supposed...

Hennessey was spilled on this Mac on top of the keyboard, but I see no liquid damage anywhere. S5 rails appear to be present, but S4 PP3V3 rails I keep coming back to. U3210 I also keep coming back to. Here are the voltages U3210 pins 6/7/12/14/18/5/11/17, but pins 19/20 both show 3.3v...

Thank you, I have saved your article as a PDF for future help. I have watched Jessa's videos from iPad Rehab about placing the red probe on ground and using the black probe to measure. My issue is I just do not understand how to use this without having a "known good" board in my possession...

I am stumped, I am getting power to pins 1 and 2 @ j7000 14.86v, but I get only .8mv @ pin 3. I have replaced L7560, U7090, and D7005, because they seemed to get pretty hot with the thermal cam. The LIO board I also replaced. I did inject voltage to a line which which led to the processor...

I did have 0 volts at one point (J7000 pin 3), but after replacing a few parts, I just measured pin 3 again on j7000, and now it is at 1.973v with magsafe plugged in. I am not finding a short at all, just that voltage drop on the 3rd pin for j7000 1.9mv @ c1206 3v3_SUS with magsafe plugged in...

I get 1.3v @ pin 3 of J7000 when plugging in the magsafe charger. I have tried injecting voltage of 5v at the pin 3, and Q7520 appears to get hot from the thermal camera, but I have swapped this out now 3 times from donor boards. I cannot imagine all 3 (Q7520's) were bad. Is there something I am...

Got it, thank you so very much! I really appreciate your help.

U8700 Nand has been removed. L9060 is reading 4.4 ohms. Not sure what to do next? I did inject voltage at R8708 pin 1 and then tested to see if any voltage is coming through, and I got nothing coming through. I assume test another EXT point to see if the other Nand chip is fried too?

Sorry about that, I am getting 1.8 ohms with L9060.

Removed U9060, pin 12 is 12.62v constantly, but pin 7 fluctuates/pulses, and pin 4 does the same.

Removed L9060 and pin 2 reads 22mv, but drops to 0, then repeats. Pin 1 reads 12.17, then drops to 1.1v. I have not removed U9060 yet. Going to do that next. If the Nand is fried, are these even replaceable?

Also L9060 pin 2 reads 4.2-4.3v, stays at this for about 6 or so seconds, and then drops to 0, then jumps back up again to the same 4.2-4.3v, while plugged in to the USB charger.