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

820-3115 must short power pads

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

  • Bouba148
    replied
    SMC_PBus_VSense.jpg

    Leave a comment:


  • 2informaticos
    replied
    Reball SMC now...

    Leave a comment:


  • Bouba148
    replied
    I've scratched the Vsense Pad shown with the arrow, and check for continuity to the R5488/89: NOK
    So I decided to put some solder there for attaching a wire, after putting solder, I mesured the continuity again and was OK, but still shuting itself down.
    Reflowed SMC, then I've lost PPBUS: 12.29V: SMC not talking to ISL + No green Light
    Reflowed again: PPBUS 12.60V OK, Green Light OK
    Attached wire because after reflow, no continuity

    Now quarter fan spin once, like back to the beginning, but mesuring 2.105V at the pointing arrow

    Leave a comment:


  • 2informaticos
    replied
    Try 85W charger and run again ASD.
    The signal should increase a bit.
    If OK, then adjust resistor divider to disable the error with 60W charger.

    Leave a comment:


  • Bouba148
    replied
    At Q5480 it looks like that all the voltages are OK, as well as both voltage dividers

    1: GND
    2: 3.307V
    3: 12.58V
    4: 12.58V
    5: 6.270V
    6: GND

    if you do the calculation of the output voltage divider it should give 2.099V and I'm mesuring 2.104V

    My guess is that the trace may be broken between R5788/89 and SMC, or ball not melted/ not soldered properly and in wrost case that pad is missing under SMC

    What do you think?

    Leave a comment:


  • 2informaticos
    replied
    Post all voltages for Q5480.

    Leave a comment:


  • Bouba148
    replied
    Smc_pbus_vsense: 2.104v

    Leave a comment:


  • 2informaticos
    replied
    Post SMC_PBUS_VSENSE level.

    Is normal that CPU power supply area gets hot when working.

    Leave a comment:


  • Bouba148
    replied
    Hi 2Informaticos,

    I've run ASD, this one went alsmost to the end ( Memory 62 Test ) but the board turned OFF approximatively 15 mins running with Fan at full speed.
    In the mean time ASD poped up with PBUS Voltage Sense & Enable (VP0R) in red claiming that the PBus voltage was under the lower limit.
    Once it shuts itself down, the board pulls 0.030A, After what the board doesn't start itself when I plug the charger, I have to press the Power button, but unfortuantrly it stays ON only few seconds.
    but If I let it for long time not connected ( like all caps are discharged ) and replug the charger, it will turn ON it self.
    I've noticed that the board is getting hot on the opposite side of C7540 C7561 area: which is Q7510 Q7520 area and related to CPU High Side Current Sense (IC0R) and PPVIN_S5_HS_COMPUTING_ISNS.
    What do you think?

    ASD.jpg

    Last edited by Bouba148; 10-06-2019, 05:02 PM.

    Leave a comment:


  • Bouba148
    replied
    Did you run ASD EFI?
    Not Yet

    Is the original BIOS of the board?
    No, as the board was doing quarter fan spin those past weeks, I've decided to write another one and cleaned ME and rewrited the SN with the medusa......
    But thta's right, as the board is now turning ON, I can piut back the original dumped bios......

    Leave a comment:


  • 2informaticos
    replied
    Did you run ASD EFI?
    Is the original BIOS of the board?

    Leave a comment:


  • Bouba148
    replied
    The board is starting after a PCH reflow but here are the issues I've noticed after reassembled everything together:

    Very slow to load OS even on external SSD
    Self Shutting down if the wifi card is plugged in, or stays ON if 4 antenna cables disconnected but shuts down when connecting to network
    Fan runs at full speed
    J3100 Slot make the computer beeps 3 times if any ram memory inserted in it.

    Did SMC reset many times: NOK
    Checked wifi card: No corrosion and clean
    installed Mac Fan Control and checked Temps: PCH is at 50°C when PCU is at 33°C

    Leave a comment:


  • Bouba148
    replied
    That's exactly my idea: to bring it to someone who has an IR reflow machine for BGAs.....will see

    Leave a comment:


  • 2informaticos
    replied
    AXG voltage appears if you open Youtube, or a graphic application.
    If you get VCORE after UC, should be problem generated by crap under BGA chips.
    Reflow SMC, PCH and CPU with good flux; or use IR oven for entire board.
    Test it and clean again on UC...

    Leave a comment:


  • Bouba148
    replied
    Hi ,
    Passed that board in the UC, and the board started few times but without PPVCORE_S0_AXG_R but PPVCORE_S0_CPU_PH1 and PPVCORE_S0_CPU_PH2 were present.

    finally the board started to act like before: quarter fan spin.....
    I will reflow U1800 again and see

    Leave a comment:

thread bottom ad

Collapse
Working...
X