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820-3437-a Works on charger but doesn't recognize battery

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  • 820-3437-a Works on charger but doesn't recognize battery

    I have an 820-3437-a macbook air that works just fine off the charger but will not recognize the battery, I have tried a new battery but still the same result. R5380 reads 5 ohms on the board, but the correct 2k ohms off the board. I get .0034 in diode mode on the smbus_smc_5_g3_sda line. any help would be great, thanks
    Last edited by Gannons3; 09-14-2016, 10:10 PM.

  • #2
    Remove U7100 and check if you get a higher value in diode mode on SMBUS_SMC_5_G3_SDA line, if yes, just replace U7100, if don't the next suspect is SMC.....

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    • #3
      removed U7100 still get the same .0033 to ground in diode mode.. is there anywhere i can get a stencil for the smc?

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      • #4
        http://www.ebay.com/sch/i.html?_odkw...encil&_sacat=0

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        • #5
          I put a new smc on the board and am no longer getting the short to ground on the data line but now i get no light on the charger and when i plug it in the fan runs full speed. the computer trys to boot but fails and gives me a bunch of lines of code on the left side of the screen then takes me to a screen that says to try booting again. Did i buy an smc with no programming?

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          • #6
            posted twice**

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            • #7
              Where did you buy the SMC??? Link?

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              • #8
                http://www.ebay.com/itm/171990330681...%3AMEBIDX%3AIT

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                • #9
                  this is what comes up when I attempt to boot if it helps

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                  • #10
                    i bought 10pcs there and none worked.... The seller dont know if those ic came from a donor board or from where...

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                    • #11
                      Sorry didnt realize theyd be so small, heres the larger images. http://imgur.com/a/YQoAt

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                      • #12
                        okay so you think the ic is junk.

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                        • #13
                          Uhm you bought a random SMC chip. These chips are unique to each board type. You need to get an identical donor board and take the SMC from there.

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