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820-3115 must short power pads
- Thread starter Bouba148
- Start date
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...
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...
Bouba148
New member
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
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
Did you run ASD EFI?
Is the original BIOS of the board?
Is the original BIOS of the board?
Bouba148
New member
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......
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......
Bouba148
New member
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?
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?
Last edited:
Post SMC_PBUS_VSENSE level.
Is normal that CPU power supply area gets hot when working.
Is normal that CPU power supply area gets hot when working.
Post all voltages for Q5480.
Bouba148
New member
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?
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?
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.
The signal should increase a bit.
If OK, then adjust resistor divider to disable the error with 60W charger.
Bouba148
New member
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
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
Reball SMC now...
