Re: Help Me diagnose A1706 820-00239 0.13v on PPBUS
DID IT!
So I reflowed U7800
and the machine then booted again
Only issue
Fans are spinning at 6000 rpm
And Kernel Task is taking 254 % cpu
Could it be because trackpad isn't plugged in ?
Given I won't ever be able to plug in trackpad.
Is there a way to disable or tell SMC not to care about it ?
Already tried resetting Nvram Pram and SMC
No difference
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Re: Help Me diagnose A1706 820-00239 0.13v on PPBUS
Hang ON
And thank you for patience as I'm re-learning power rails and I think I've found the correct order
So
PPBUS_G3H is ok at 12.98
Then I went on Measuring the PP5V_S5 rail and got 5 volt
So I went on the 3V3 Rail PP3V3_S5 and found it appears just a few seconds after plugging in the USB C and then its quickly cut off
Seeing its generated by U7650, nearby coil L7660, I measured the resistance to ground and got 7K. So it doesn't seem to be short neither it seems to be...
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Re: Help Me diagnose A1706 820-00239 0.13v on PPBUS
Found the short
I removed F4500 and now I have 12.84 volts on PPBUS
Still
no signs of life
Now its drawing 0.13 amps at 20 volt
cpu is warming up
Further Check
I have no voltage on PPVCCSA_S0_CPU neither on PPVCC_S0_CPU
what should I check next ?Last edited by zipporobotics; 02-17-2023, 08:20 AM.
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Help Me diagnose A1706 820-00239 0.13v on PPBUS
Hi everybody
trying to get data out of my MacBook Pro which I accidentally liquid damaged.
A Small drop of tea travelled on the back of the board nearby the trackpad connector: blowing it (see picture) digging a small hole in the motherboard (probably removed the first two layers.
[url]https://imgur.com/a/TyHyyPm[/url]
Cleaned everything
Now trying to get this machine to boot again
Reading up a few post I've done some tests
Removed battery
[B]A few measurements[/B]
- PPDCIN_G3H (19.95...
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