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820-00165a no EDP_BKLT_EN

T

TBFix

Member
Hi Im working on a Macbook air A1466 which was water damaged and was dead with no led on charger.
I currently have it powering up fan spin. All major voltage are present.
I have no chime or screen and am not sure of usb activity but usb mouse red led flickers at the start of power up.

Currently I have no EDP_BKLT_EN and no output from Q77706. U7701 has power on pins C4/D1/C1 but no output .
The unit draws about 350ma.
L7701 ha no voltage on it due to Q7706 not passing voltage pins 3 and 4 have 8v.

i have flashed the bios with a file from the forum but still the same.
Any help welcomed
 
T

TBFix

Member
Yes I tried 2 screens 1 cracked and the backlight is the same on both, will try the return resistors.
Thank you for the assistance.

Edit.. LED_RETURN_2 using diode mode is reading .019 all the rest are .63 so I guess U7701 is bad.
 
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T

TBFix

Member
I seem to have sorted out the backlight issue but when testing the battery to see if it charges I now have another issues. The system doesnt see the battery or charge it.
With just the battery in I get 8.23v on ppbus_g3h F7140.
I have 8.23v on pins 1-3 on batt connector , pins 4 and 5 3.3v fluctuates frpm 3.3 - 3.0 on both pins. Pin 6 is at 0.22v.
R7151/52 read ok
I have tried 3 different batteries
 
T

TBFix

Member
No I have 1 charging and running off the same model board in a different chasis.
So this battery has some charge and will power up on the other chasis but wont on the one Im working on.
 
T

TBFix

Member
I have 8.23v on pins 1-3 on batt connector
3.3v on both SCL/SDA lines.

Os does not see a battery. Everything else works fine. I managed to install fresh Os. So there doesn't seem to be any other issues other than seeing the presence of the battery.
 
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2informaticos

2informaticos

Administrator
Staff member
I was asking about SCL/SDA voltage, apart of diode mode reading.
If both steady 3.3V, change SMC.
You can try changing ISL6259 first, just in case.
 
T

TBFix

Member
Hi as previously mentioned SCL/SDA voltages are 3.3v . Isl was changed for new one but still the same.

How to know if the board sees the battery?
 
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T

TBFix

Member
Reballed the Smc an seems to be working now, charges and runs from battery . Will test more. There must be an easier way to align these smc chips?.
 
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