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820-00875 PPBUS_G3H boosting after liquid damage

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  • #16
    It sometimes works and runs for a while, other times it starts for only 2 seconds. I’ll be away from work until Tuesday now but will carry on when I’m back. Thanks for your help so far

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    • #17
      Did you pass it again through UC?
      You should have corrosion problems still...

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      • #18
        I've put the board back through the UC, PPBUS_G3H is now sitting at 0v.. So I'm guessing whatever poor connection there was has vanished now.

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        • #19
          There should be broken trace, or solder.

          Try good flux and heat SMC and CPU.
          This will not solve broken trace, but give it a try.

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          • #20
            I'll flux and heat the SMC with 559 flux and give the cpu a little heat without flux (I'm assuming you didn't mean flux the CPU also)

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            • #21
              Ive got a constant 5.2v on dc in now also

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              • #22
                No different after the SMC reflow

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                • #23
                  I always take photos of the board before starting anything like UC.. would they help at all?

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                  • #24
                    That's good to see where to investigate, after board is clean.

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                    • #25

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                      • #26
                        After the board went through the UC, it actually looked great. Obviously something is bad but all the liquid damage appears to be at the DC end of the board

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                        • #27
                          When the battery is connected, I get 12.6v on PPBUS_G3H.. 0v when only on the charger though
                          Last edited by nik1981; 04-17-2019, 12:14 PM.

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                          • #28
                            Puff, liquid spill close to backlight output; that's big danger for the new boards
                            Supposedly problem with USB-C controllers...

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                            • #29
                              Yeah that's quite a bit of liquid damage. Do you get 5 volts on DC in for both ports currently? How do the chargeports look currently badly burned or OK?

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                              • #30
                                I get 5.2v on both ports. The charge ports look perfect, all the fuzzy coating came off in the UC and no pins etc are burnt or tarnished.

                                Any ideas?

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