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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...
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.
Liquid damaged board.
I don't fix boards often so some general advice would be good too.
u7100 is a little hot at about 23 degrees (thermal cam)
There was liquid damage around u7200 and U1930, and u1845
PPBUS G3H present and correct
PP3V42 G3H present and correct
PP3V3 S5 present and...
Macbook Pro boots OK able to log in etc.
keyboard and trackpad appear to be functioning OK.
Apple diagnostics says may be issue with SMC (vague I know)
All temps shown via MacFanControl are OK.
So, how would I go about narrowing down the issue to find what sensor or fault is with this mac?
I have a Macbook Air which will draw approx 3amps when connected to battery and plugged in. Then will hover around 2.1amps after about 20 seconds.
Fan spin up to 100%
No video output / screen
Not sure where to start with this one!
Water Damaged Motherboard - U3210 was burnt beyond all recognition.
Is this likley to be repairable ? I think I'll have to run jumper wires / find some way of instaling the C320 again.
Is this requried fopr the computer to work beyond supplying power to thunderbolt...
Fun little one I belive will be an easy fix!
Here's what it does
- Power button doesn't turn machine on, but will allow us to turn off. (therefore not keyboard)
- Computer will run on battery power alone, but not turn on when only battery is connected
- Computer will auto power on...
Board is obviously corroded in about 5 places.
Power supplies 20v, 0.04 amps on all 4 ports after a little clean with Qtip.
I have a schematic diagram but not the board view file. Will search for this and try to update rails.
We have a Macbook Air not powering on.
We have PP3v3S5 but no S4 rails
S4 Power Enable is missing
PM SLP S5 L is 0v
SMC RESET L 3.4v
Is this SMC issue?
SMC is not hot.
Hello, long time no post.
I have a 820-00850 board which has no power, USB provides approximately 5.2v on all ports and 0.05 / 0,06 amps.
We have got
Have not got
I'm unfamiliar with exactly how this model works, aside from a few of louis' videos.
Looking at the...
Sometimes boots normally and functions 100%.
Other times, fan will spin, with no video or chime.
Board looks good with no obvious signs of corrosion.
Not a backlight issue. Will sometimes chime and boot normally. When it does not chime there is no video / backlight...
Macbook is OK booting and will stay on for hours.
Shuts down (seems to completely just power off) when doing something intensive like HD youtube.
Have not managed to "catch" it yet.
I have tried with a different battery which made no difference.
PPVOUT_S0_LCDBKLT - 1.3mv
PPBUS_S0_LCDBKLT_FUSED - 12.86v
LCDBKLT_EN_L - 12.72v
PPBUS_SW_LCDBKLT_PWR - 12.87v
PPBUS_SW_BKL - 12.6mv
Is my Q7706 bad or should LCDBKLT_EN_L be a low / 0 voltage?
Computer appears to start, then trips out.
Bench PSU shows draw from .25ma to approx 1amp after 1 second. which then resets and starts again.
Client says it sometimes turns on normally.
Some kind of over voltage protection or a shorted component tripping a circuit?
Not sure where to start...
Computer turns on, no chime, keyboard light or video.
Tested CPU power coils 0v.
ALl SYS PWRGD 3.5v
PP3V3 S0 us 3.5v however I get no voltage at 2 of R1950 - should I replace this resistor? (CPUVR PGOOD)
Does anybody have schematic for the above computer?
Also can anybody recommend an alternative wire for running leads ? I can't find anything locally (Australia) and many Amazon sellers don't ship to Australia.