DC voltages for 820-2565-A for MacBook Pro A1278 MC374LL A?

Would like to know what the voltages should read on the 820-2565-A MagSafe board to test in circuit?

Is 17.98 volts and 3.5 volts the correct input voltages for the board from the power supply?

Also the battery pin outs and what the correct voltages would read?

I get 11.75 volts and 3.5 volts at the battery socket.??

I have a steady green light at power supply and two green lights when test or press the battery level button. If I remove the power supply the battery level indicates two lights.

Reconnecting the power supply the battery level shows two green steady and the third flashing and then fade out.

MBP will not power on but seems to have input and battery voltages.

Thanks in advance for any input.

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where are you measuring and what are you measuring.


The five pin solder points on the back of the 820-2565-A board.

pin one grd, pin two 17.98 v dc, pin three center 3.5 v dc,pin four 17.98 v dc,and pin five grd. just above Apple part no.

The output voltage of the power supply at contact of the Magsafe board.


Any chance you can take a picture of where you are measuring? That way I could check the power diagram and see what I can come up with



Any chance I could get a copy of power diagram??


Great image;-) still trying to figure out where you measure


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drnay, I posted the schematic for this computer on here. Just scroll all the way down the page until you hit schematic. :-) it should provide you with some assistance. Hope this helps, good luck.

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i followed link but dont see schematic pls help...thx!!!


would like that link too, thanks !


@palitoo looks like Apple did not like that link ;-) email me and let me know what it is that you are looking for.


Thanx @oldturkey03, i already found out what my problem is… logic board is missing two components : U6990 and R5001. you don't happen to have those, do you??? :D


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drnay will be eternally grateful.
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