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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.
Client has brought in laptop with their son saying there is no screen.
I get the laptop in the bench and open lid... perfect video. This morning nothing on display for about five minutes, I go away for a bit to find a torch to see if it's just no back-light and the laptop is on again and...
Interesting set of symptoms
Laptop works OK but will shut down under load on Battery and Cable. Chrome is fine but not too many tabs open or away it goes!
Completely shuts off after battery reaches 60% - client replaced battery.
Client claims laptop was water damaged and he ordered a new board from overseas.
With this new board he has no backlight. I've tested a different screen on this computer there is also no backlight.
A1398 EMC2909 (original model)
I assume I would start by checking backlight circuit...
Macbook comes in. Does boot, but green light on charger.
I disconnect battery, and try with just charger no luck.
I investigated the other side of the board and found corrosion on U7840 which I removed.
Success! Computer now boots with battery and charger connected. BUT the keyboard does not...
Apologies I can't seem to find the board number. Client has liquid damage. She said was WAS turning on so she took to Apple for a checkup, they told her to replace entire unit and now the unit does not turn on at all. I have examined the board, there was a lot of water in the macbook but...
Issue happens with external and internal boot drive
Issue happens when trying to boot to safe mode.
Verbose boot hopefully provides some clues (last 2 lines)
IOBluetoothFamily -- missing Bluetooth Controller Transport!
I have tried...