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Hi Folks,
Got a 820-2936 that runs slow yet passes all AHT and ASD (OS and EFI) tests.
Dirty inside but after a good cleaning no signs of corrosion. Same behavior with or without battery and other component isolation.
Figured this would be a sensor issue but no issues are found.
This was...
Green light turns orange after a few sec and stays that way.
U1900 has 3.3 or 3.4V on pins 1, 2, 5 and 13. 372mV on pin 12 and 60/70mV on pin 4 (this was 330mV when I measure before and before that it was fluctuating all over the place. Not it holds steady at 60/70mV).
U1950 16mV pin 2, 3.4V...
820-4924 appears to have all G3H and S5 rails at the right voltages, green light that responds to SMC reset yet no power. U7600 had a little bit of crud on it so I replaced that, no other issues visually with the board.
I ran out of hints as where to look next. Any pointers appreciated.
Hi folks,
As I foresee my first SMC reball in my near future, I am looking for a good clamp/holder that can hold a chip and stencil and is sturdy. Don't mind if it takes up some space. Also which solder paste is preferred or is buying the balls better? Finally, a good stencil. I see one on...
Ah I see what you mean. I use 85W tips to use with the PSU. Only other battery I have is empty from a machine that "doesn't recognize battery" so hardly reliable. Tried it anyway, it's not charging as the Mac still only pulls about 0.020 Amps.
This Mac draws 0.019-0.025 Amps at 16.5V
Green light on charger but no power. Does not respond to SMC reset.
In measuring rails I got to PP5V_S5 which fluctuated between 3.8 and 5V.
Replaced U7941 and U7200. Now a consistent 5V on PP5V_S5. Still no power though.
Moving down the rails I got no...
Bummer. Though at this point it’s running 100% and passes all ASD OS/EFI and AHT tests. Both on battery power and connected. Battery is 100% though, gonna drain it and see how it acts.
this came in dead, no power. Found corrosion around thunderbolt port. Cleaned and replaced what was bad and unit now powers on and passes all tests I throw at it. The backlight acts a little funky though.
Backlight only activates once progress bar starts loading under the Apple logo, not...