MACBOOK AIR A1279 AUDIO

[ohspecial1]

Hi

Macbook a1279

Have changed audio board but not cables yet

No audio but if you plug in a pair of headphones sound seems fine

Any idea

Doesn't seem any corrasion but havent removed the board yet
No audio out of either speaker

Did see a note on wiki about T2

 

[2informaticos]

Do you mean A2179 instead?
That one has T2, yes.
And suffers by liquid spill on audio board.
Remove the board and check it for corrosion, as the audio flex too.

 

[ohspecial1]

Hi sorry yes you are correct

Have changed audio board if you mean the board which has the jack socket on it

I havent changed the 2 flex cables yet

When i put replacement board in still no volume

But unsure if speakers are working

If i put headphones in can hear sound

the audio board looked clean and with just swapping it over with a replacement didnt make a difference

Will check cable

Is there any known issue on the main board of these

 

[2informaticos]

Check diode mode to ground at pins 32 & 33 of J6100.

 

[ohspecial1]

Hi
Do you happen to know where the protection circuitry is on this

As this morning i have no power
when i plug into my usb tester is only staying at 5v not switching and not pulling any amps

I wonder if a fuse has failed

Also strange thing on the other 1 i have that works even with that audio board you talk about missing plays the start up tune

 

[ohspecial1]

PPBUS_G3H when i go between C6482 1 side isground 1 side is ppbus

I get 12.17v

 

[2informaticos]

"Check diode mode to ground at pins 32 & 33 of J6100."
???

 

[ohspecial1]

Hi i will do that
But was powering up and everything yesterday but today doesnt power up at all
and only shows 5v on usb tester so must have a failure on something
So from working but no sound to not working

so needs to get power back first

 

[2informaticos]

Do you get 3V3_G3H_RTC?
Tested board alone on the desk?

 

[ohspecial1]

Hi

Will do a test tomorrow i have a feeling someone removed a connector or something on audio board and left battery connected

according to repair wiki PPBUS_G3H should be 12.6v

 

[ohspecial1]

Do you get 3V3_G3H_RTC?
Tested board alone on the desk?

Hi testing on r6959 3.2v but seems to cycle

3.2v then 1.74v

 

[ohspecial1]

Checking on my working unit that should be 3.2 fixed i believe

"Check diode mode to ground at pins 32 & 33 of J6100."
???

pin 33 on diode mode(squeeler) settles at 0.17

 

[2informaticos]

Compare diode mode readings on J6100 with good board.
Very low readings on T2 data lines, may point to damaged T2.

 

[ohspecial1]

ok thanks so possibley dead for some other reason and the T2 being and audio failure

so a total scrapper