I have here macbook air a1466 820-3437-b the problem stuck for 1month and now the laptop not turning on. plugged in the charger goes to green light blinking and the stead at orange light nothing happen.I have checked PP3V42_G3H C3740 on the schematic it shows 6.3v but only measured 3.4v and PP3V42_G3H C4650 schematic shows it must be 10v but measured only 3.4v, the R4650 Resistor in schematic shows 100k but measured 94k. anyone can help me on this please
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Re: Macbook a1466
3v42 is the correct voltage here.
The other values are the rated voltage for the capacitors.
What is the voltage of ppbus_g3h ? -
Re: Macbook a1466
ppbus_g3h R5450 Both pins have 8v and chip U5450 Pin 4 and 5 IN have 8v both but pin 6 out no voltage.and ppbus_g3h R5501 in the schematic supposed to be 100k but measured only 20k fluctuating readingComment
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Re: Macbook a1466
anyone could help pleaseComment
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Re: Macbook a1466
U7100 CHIP connected c7115 in the schematic supposed to have 10v but it read one side 0.5v and other side 1.4v only and C7116 supposed to have 16v but only reading same voltage on C7115Last edited by String2016; 09-10-2022, 08:15 PM.Comment
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Re: Macbook a1466
Mate you are all over the place. Start over and begin with the basics. Board outside the case, no battery, plug in a LIO board and flex, apply power via Magsafe. These boards should power on automatically. You should have PP3V42_G3H @ 3.42V (which you must have since you have green/orange light), PPBUS_G3H @ 8.3V (or 8.6V if SMC is running) and PP3V3_S5 @ 3.3V. Then you troubleshoot S4 state from there.
PPBUS_G3H will measure lower if the battery is connected so you leave that out during troubleshooting. 820-3437 boards will also do a couple of stop/starts on fan spin before booting.Last edited by piernov; 09-11-2022, 08:38 AM.Comment
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Re: Macbook a1466
board is outside the case tested plugged in magsafe turns orange then green then orange light nothing happens even battery unpluggedComment
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Re: Macbook a1466
Measure:
PPBUS_g3h
PP3V3_S5
After the above, do review this great website & webpage on topic on the required sequence of voltage rails and events before the logic board will power up:
https://www.it-tech.com.au/mac-q-a/pm-slp-s4-l-timing/Last edited by mon2; 09-11-2022, 07:27 PM.Comment
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I received a 2013 Macbook Air A1466 820-3437-B motherboard with serial number C02L6GQ9FSV8 that came in WITHOUT a bios chip. I got a new bios chip and reprogrammed it. Macbook now powers on but doesn't boot the SSD. I've flashed a ton of bios but still same problem. Windows installation works with this Macbook but never a mac installation. Unfortunately, since I didn't receive this macbook with a bios chip, I don't have the original bios. What can I do now?... -
Hello all,
Working on my wife's 13' Macbook air. It's been in a box since she upgraded but I figured it could be good practice.
Details:
Macbook 13' A1466
Board (820-3209-A)
Battery OEM 7.3v 50Wh 6700 mAh (020-7379-A)
Pictures below of Boardview and schematic...
I don't know how to test the voltage on a MacBook battery. I just assumed it had an enable pin but the best I could read was 300 something mV poking around the battery connector.
It's an older model and it is very likely that battery has become... -
Hi all,
i got a A1466 with serious water damage. I was able to clean the whole board and only found a fuse with a coroded trace. Cleaning and resoldering did the job and the macbook started normal but after some time the screen began "flashing" like turning on and off while the Macbook was still running. I checked the board again but was not able to find the problem until now.
Any ideas where to look?... -
Could someone help me?
I have a Macbook Air A1466 EMC 3178 - 2017, board 820-00165 and sometimes the boot interrupts with an image of a folder and a question mark.
Could it be the BIOS? -
Could someone help me?
I have a Macbook Air A1466 EMC 3178 - 2017, board 820-00165 and sometimes the boot interrupts with an image of a folder and a question mark.
Could it be the BIOS?Yesterday, 04:12 PM
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