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Yes we had a working donor. We put PCB on working donor and it the same thing. Look like it does not give any video output. What might be the issue? Can you tell me where is J8500? Thank you

Hey guys we have an update, the MacBook now chimes, fans spin continuously, caps lock works, and we have usb activity. Despite all of that we still do not have and activity on the screen, we tried to connect an external display and we have no activity. Any idea what could be causing the...

would you happen to have the schematics or know where to get them?

Hey guys, We have guys we have a A2141 MacBook pro that has been damage by water, it uses 20v and 3.23a but has no chime, the screen shows no activity, but, the fans spin up and spin down and the cap lock lights up when pressing it. Would you guys have an idea regarding the issue that is...

I soldered a small wire to L3500_VWR and injected 1 volt but it did not use any amps.

So you mean we can inject it, but we need good thermal camera to detect slight temperature fluctuations?

Should we inject voltage to try detect the culprit?

L3500_VWR is .0236

What can be causing this issue and how can we fix it? What should be our next step?

L3500_VWR ->.0230 with beep L8100 -> .0494 with beep L7400 ->.1118 with beep L7230 -> .0216 with beep L7220 -> .0216 with beep L7210 -> .0216 with beep L7660 -> .4365 with beep L7600 -> .4257 with beep L7030 ->.4951 with beep L8410 -> .9504 with beep L3500_VXT ->.1995 with beep

sorry yes that was voltage reading, it say .4032 in diode mode and it beeps.

L3500_VWR -> 0v L8100 -> 0v L7400 -> 0v L7230 -> 0v L7220 -> 0v L7210 -> 0v L7660 -> 3.375v L7600 -> 5.164v L7030 -> 12.17v and then drops to 10.22 L8410 -> 0.013v L3500_VXT -> 0v L9080 -> 0.032v

Just double checked, C6581/PPBUS_G3H and C3504_VWR:1/PPBUS_G3H have the same voltages. The machine is not recognized in DFU mode. I have attached pictures for to see the damage, we washed with deionized water and it is now clean.

Hello, We have a A2251 MacBook Pro that has water damage across the board, when connected to a port the board uses 5.09v and .28a and after a few seconds switches to 20.6v and 0.05a. We have a measured some voltages on the board: C6581/PPBUS_G3H -> 12.63v C3504_VWR:1/PPBUS_G3H -> 12.32v...

I understand that this line is missing and we need to find a source element which is generating this line. Basically we have to trace back to the source and understand why source of the link is not working. Is that correct approach? And also one more questions --> how to find the source of this...

5 -> .8 7 -> .8 8 -> .0 12 -> 4.4

When we removed the U5700 chip the amps went up to 0.08 and after placing it back the amps went back down to 0.00. Is U5700 at fault here or is it some other component?

I have Removed U5700, it looks clean and no visible damage underneath it. The behavior of the board has not changed and is still using 5.27v and 0a. Should I return the chip?

We have a question, If we have a short on the board then we should have amps as well right? The board is not using any amps currently.

R5700 is burnt and the board has a hole in it, I have attached a photo for you to look at. We also bypassed R5710 with a tiny wire and have power there.