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820-02935 051-08286 Rev 5.0.3 for Apple MacBook Pro

Hello, We have a A2991 MacBook Pro with a Board 820-02935-A that has some water damage around PPBUS_AON_LUXE and around PPVIN_P3V3SD, when connected to charge it uses 20V and .20A but after some time the USB Tester restarts and continues to restart. What should we be checking first? I...

These are the diode mode Measurements for the Patient Board. __With_out_Elements___ CR857/PBUS_AON -> 4.9 with beep __With_Elements___ CR857/PBUS_AON -> 4.7 with beep We also Have a Working Donor Board and here are its Measurements __With_out_Elements___ CR857/PBUS_AON -> 4.6 with beep...

Hey guys we have spotted a difference between elements on our board and our donor, I have attached a few photos for you to take a look at. This MacBook was looked at by someone else before reaching us, is it possible they have removed these elements? Is the difference of elements is related to...

Sorry my engineer made a mistake in measuring. Once we removed those to F5200 elements, we have 12.33v on the capacitor C5250. It looks like it has good voltage. Thank you for your patience. Please advise if we put them back or let us know what to test further.

I have checked voltage. should i check diode mode as well?

C5250:1 -> 4.475 C5250:2 -> .013

5v and 0a and then it restarts.

Hello, We have a A2485 MacBook that has logic board failure. Customer says there was not water damage. He said screen went black while he worked. We removed the board. There are 3 USB C ports. When connected it shows 5.26v and 0.22a and restarts. Looks like it detects something and restarts. I...

Hi guys, We have a MacBook Pro A2141 model laptop with stuck on loading bar. Customer do not say it is water damaged. The laptop turns on without chime. Fans spins fine, uses 20v and over 1amps. It holds battery and charges. We see apple logo and stays on loading bar then. When you turn off...

1 -> .4506 3 -> .6839

lets the hypothetically, if there is damage to the GPU would the mac book still chime and would the fans spin? How would we know if there is damage to the GPU specifically?

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