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820-3115-B - Need to hold down power button to turn on

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  • #16
    I can't seem to get good contact with any of the pins on U7000. There's a bunch of sticky leftover flux crap that I can't seem to get out of this area, which is blocking me from making sold enough contact with anything to measure properly through. Any tips to clean it up? Q tips just rip apart and leave me with an even messier area, so i'm not gonna try that again

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    • #17
      I dont know which flux are you using, but should be easily removed with IPA and a tooth brush.......

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      • #18
        I guess I just wasn't using enough alcohol last time. Cleaned it up a bit and now I can get a better reading.

        It "seems" like pins 17 and 18 are bridged. Not getting continuity from pin 1 of r7051 and pin 18, or even the little dot above it, so that trace may be broken on top of 17 and 18 being bridged. Gonna try to fix all that and see what happens!

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        • #19
          FIXED IT!

          No 100% CPU usage, turns on right away, runs off battery, ect.

          The problem was the broken trace. I just kinda swiped over all the pins on that side to get em separated then tried my best to get some solder down to that other pad pin 18 connects to.

          Plugged it in and it turned right on! Gonna run ASD on it to make sure this wasn't the only problem though.





          Anyway, thank you guys all so much for your help! This is the first board i've ever successfully repaired. Literally never thought i'd get to the point I could do this. I'll make sure to update everyone if my house starts on fire after leaving the computer alone for a bit.

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          • #20
            Perfec!! Congratulation!!

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            • #21
              After having the battery in for a bit, i'm noticing a high pitched whine coming from the battery connector area. Everything still seems to be running great, but the noise leads me to believe something isn't finished... Any ideas?

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              • #22
                Remove battery and see if noise is still there.. Try with a known good battery.....

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                • #23
                  It's only there with the battery in. I tried with a few different batteries and it still does it. Had it running on battery for a few hours now and it's still running at least!

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                  • #24
                    Originally posted by Antonio View Post
                    I can't seem to get good contact with any of the pins on U7000. There's a bunch of sticky leftover flux crap that I can't seem to get out of this area, which is blocking me from making sold enough contact with anything to measure properly through. Any tips to clean it up? Q tips just rip apart and leave me with an even messier area, so i'm not gonna try that again

                    hot air at 500f and air as high as it can go. then just dump in ultrasonic while still hot. or, toothbrush/alcohol after heating up the flux and crud.

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                    • #25
                      Originally posted by george-a View Post
                      (sorry for jumping your thread Antonio - question opportunity!!!) Louis could you also explain how can ISL send 16V to SMC? And how can we test if that happened?

                      The ISL6259 talks to the SMC on a 3.42v data line. The ISL6259 is also responsible for 12.6v creation which it sees on the CHGR_PHASE pin, and 16v from the charger on CHGR_DCIN pin.

                      If the ISL6259 dies, it can short out internally. Before R7005 blows/the charger goes out, poof... 16v right to the SMC data line.

                      and bye bye smc

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