thread top ad

Collapse

Announcement

Collapse

READ BEFORE REGISTERING SO YOUR ACCOUNT WORKS

In order for your account to be activated INSTANTLY, your PayPal email MUST MATCH THE EMAIL YOU USE TO REGISTER YOUR ACCOUNT ON THIS FORUM!! If your PAYPAL email address differs from your FORUM email address, your account will have to be activated MANUALLY when a customer service agent gets around to it.

I realize this sucks, and I do apologize.
See more
See less

Macbook pro 13, 820 2879 b, Turn on only with batery

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Macbook pro 13, 820 2879 b, Turn on only with batery

    Hey guys,
    At first i have a problem with ppv3v42_g3h, because some liquid damage close to u5010. i clean up and 3v42 came back..
    After i have a prob with =ppbus_g3h, only have 1.4v.
    I take the fuse F7040, and have 1.4v in the same sides(pin1 and pin2).
    i already change u7000 and capacitor c7040..
    the board works fine only with battery.

    any ideas ??

    cumps

  • #2
    Sense resistors R7021/22/51/52 or the traces connecting them to ISL and R7020/50.

    Comment


    • #3
      Sense resistors is fine, R7021/22 = 10ohm, 51/52 = 3 and 0.7 ohm.. Traces is ok too.. =(

      sometimes i get 12.6v unstable and then drop to 1.6v.. only turn on with battery and dont charg the battery...

      Comment


      • #4
        Must be corroded trace in sense circuit. When PPBUS drops to 1.6V does 3V42 bus stay high?

        Comment


        • #5
          ya, i have stable 3v42.. the traces around U7000 appear to be well. if i let the charge on board PPBUS stay on 12V6, unstable but ok..

          Comment


          • #6
            What is unstable? With a battery connected it should be stable.

            Comment

            thread bottom ad

            Collapse
            Working...
            X