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I have a macbook air U7100 is hot, drawing a total of 39ma.
I have replaced U7100, what would be a good next step for troubleshooting?
PP5V1 CHGR VDD 5v
PP5V1 CHGR VDDP 5v
CHGR DCIN 17.9v
CHGR VCOMP R .78v
PPDCIN G3H CHGR 17.85v
F7140 Pin1 8v...
Board looks to be in good condition. Customer described as having trouble starting machine this week, now doesn't start at all.
What we get...
=PP3V42 G3H REG 3.42v
=PP5V S4 0v
= PM SLP S5 L 0v
= S5 PwrGd 3.3v
Macbook Air - replaced screen and tested backlight works OK
When I power on after disconnecting battery the "Bong" sound goes repeatedly, untill I restart once, then it will "turn on" normally but with no display.
Nothing on the display best I can tell, even with torch in the background...
Sorry, I don't do that many board repairs. Maybe 20 a year.
I have tried SMC in bypass mode with no change. i.e. I still get the power pulse and no fan spin.
I will give up on this board for now. Thank you for the help.
In SMC bypass mode the board does the 3 second thing.
(Just checking, hold down power, plug in magsafe, hold power button for 10 seconds, release) Fan immediately spins but ony for a second.
I'm not 100% sure what you mena by " all big coils; especially PCH/CPU. " but this is what I've...
No power supply connected with Diode Mode.
"With no battery connected no boot / fan spin."
- With no battery connected, the laptop does not do quarter fan spin, or boot in any way.
Computer was "fine" before customer brought it in.
Quarter fan spin when battery connected.
With no battery connected no boot / fan spin.
PPBUS G3H 8.2v
PP3V42 G3H 3.4
PP5V S5 5v
I replaced capacitors C1992 and C1902 as they looked damanged
Thanks in advance.