Thanks [USER="169897"]piernov[/USER], I may be wrong about the startup order, but in either case, my experience is that this condition is indicative of a dedicated GPU hardware failure, common on this model. This can be brought back temporarilly by a GPU reflow or by using the dosdude1 patch process.
Hopefully, this will help [USER="329820"]lordhex[/USER] or anyone in this position to get their MBP back with limited operation. I've done several of these with the dosdude1 procedure and it has worked well.
Another test is to boot with Linux and see if computer completes...
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Sorry this is a bit delayed...
Yes, it is a GPU fault. The transition you see is where it switches from internal to dedicated GPU.
It is possible to bypass the dedicated GPU a couple of different ways. Dosdude1 has a procedure that although lengthy, it does give you back the use of the computer. I have done several of these with success.
Do a search for him where he will outline the process on his website.
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Re: Macbook A1466 dies when charger disconnected
I had something like this on an A1398 where the computer showed the battery at 71% but not charging. it also would not run on the battery. in my case the battery was faulty. I agree with mon2... it's best to have another battery to compare with.
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Re: MacBook Air 820-00165 Camera Not Detected
OK, I have it back now. one of the resistors that I replaced some time ago (R2281) had rotated 90 degrees cutting off the PP1V2_S3 to PP0V6_S3_MEM_VREFCA_B. Not sure how that happened but it's connected again and the computer comes on.
I loaded an EFI image that piernov provided in an earlier thread and that works great.
I'll need to think about whether to pursue this camera issue or just accept that it's not going to work. I don't like to give up on problems but I don't want to risk anything more with this while it's working....
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Re: MacBook Air 820-00165 Camera Not Detected
So now there is a bigger problem...
I've spent the last couple of days trying to sort out what appears an an SPI termination issue after trying to load a known working EFI file. I get the fan start, stop every 3-5 seconds, or occasionally a boot loop where the chime repeats ever 3 seconds. All of the termination resistors appear good but it's not loading properly.
I've loaded at least 3 different EFI files from this forum and none of them appear to work, or there is another issue. I'm assuming there is another issue because...
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Re: MacBook Air 820-00165 Camera Not Detected
@piernov, good thought on the CAMERA_PWR_EN. It wasn't being enabled, and when I looked to find out why, I found that the resistor was missing on the board. This board has had a lot of missing components but I thought I had found and replaced them all.
After replacing the the resistor R2030, the camera and PP1V8_CAM are now present, but the picture is black and the green light at the top of the screen is flashing.
I just moved an EFI from a different computer so I may need to refresh it with a clean ME and maybe to a PRAM...
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Re: MacBook Air 820-00165 Camera Not Detected
I've been doing more research and noticed that if the ME region is not clean it might cause the camera not to be present. I'm pretty sure that I used a clean ME file from this forum on the computer in the not too distant past while doing other troubleshooting.
I'm a bit surprised because when I got this board a month ago I was sure that the camera was working.
I think you're right about the reballing or replacing the camera IC. I may just have to accept that the camera is not going to work on this one.
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Re: MacBook Air 820-00165 Camera Not Detected
Actually the display is not attached but the camera was when testing. It was not connected when doing the diode mode measurements.
Pin 4 of the camera connector is showing a short to ground but I believe there is a 0-ohm resistor to ground on that leg. All of the other pins measure at least 0.401. So, none of the lines appear shorted. I can only assume now that there is an open or the chip is dead. I believe Paul Daniels has mentioned in the past that the chip is sensitive to heat so that's why I'm being careful with i...
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Re: MacBook Air 820-00165 Camera Not Detected
Thanks @piernov. I thought later that might be the case.
Would it be safe to try a reflow on the Broadcom chip or do you think it's just dead? In an earlier post on a similar problem, the member said the camera was working after a reflow, but he didn't say what he reflowed.
I've tried a different camera and the PRAM / SMC resets without any luck.
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MacBook Air 820-00165 Camera Not Detected
Hello All,
I have another weird problem. The camera on my 820-00165 appears to not be present. I've seen piernov's link and tried it under Linux but it doesn't work there either. One thing I've noticed is that I don't have the PP1V8_CAM voltage that is obviously required. I'm unable to determine where it's generated.
Voltages on the J4002 connector are as follows:
1 GND
2 MIPI_CLK_CONN_N 0v
3 MIPI_CLK_CONN_P 0v
4 CAM_SENSOR_WAKE_L 0V
5 MIPI_DATA_CONN_N 0V
6 MIPI_DATA_CONN_P 0V
7 GND
8 SMBUS_SMC_1_S0_SDA...
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Re: MacBook Air A1466 2017 Operating Very Slow
Voltage on U5540 pin 4 hoovers around 0v with the board removed from the computer. this compares to a 2015 that i have under the same conditions. Measurements compare between the two boards. The voltage does jump to about .2v when the board is powered, then drops back probably due to the missing trackpad. Again, both boards exhibit the same levels.
I did some diode checking on the SMBuss and compared the two boards. They have very similar values so probably not an issue.
SMBUS_SMC_1_S0_SCL .553
SMBUS_SMC_1_S0_SDA...
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Re: MacBook Air A1466 2017 Operating Very Slow
I can check those resistors but I don't know which they are. Do you have the locations?
I believe the CPU operates at near 100%, but for some reason is only operating at 0.5-0.6 GHz. No wonder it takes so long to do anything.
I did a reading on a 2013 MBA that I created a thermal sensor failure on. In this case the fans speed up as expected. Results are similar to the 2017 except for the very high power draw. screen capture is attached....
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Re: MacBook Air A1466 2017 Operating Very Slow
I too have seen where some newer OSs will not load as well as older ones. In this case I am using Monterey, but loading Big Sur exhibited the same results. I had two other 2017s running Monterey with no problem so there is no reason this one won't either.
There is obviously some hardware issue that I need to resolve if I'm going to be able to use this logic board.
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