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And then again, it just now decided to boot for me via command R into recovery via bluetooth keyboard and USB mouse...So some keys must work before chime...

The keys do not work even before the chime anymore, as they did before once when I booted into Safe mode and brought up the boot menu via option. So no KB norTP either way. That is with L/O connected.

Thank you 2 info, I found a spec of debris in the L/O cable.Removing it it now keeps the mag light on. When I then disconnected L/O cable, and started it booted to desktop. Still no keyboard though...and fans running high. I cleaned the ends of the TP/KB cables and terminals, no cigar...

Thank you John. I will give that a try. Louis has a video where he says that if the MBA keyboard registers before boot chime, ( such as holding options) but not after, that I am basically screwed. He had many of these machines and never resolved it , I guess on a logic board level... So i can...

This one had endured a tropical rainforest, which fried the display, but was still working on external monitor. I think, if I remember correctly, even keyboard and trackpad worked then on external monitor. So I installed a new LCD, and it boots up fine, except now the keys and trackpad do not...

How does the Master Louis say it: Baddabing! Rebooted a few times, seems stabil!!

And now, for something completely different: After I removed C7782, the LCD now is operational.....wtff?

OK, I tested Q7706 which has voltage only on p2 ands p5, 3.3V each. Then I looked at C7782 which was corroded enough to nearly fall off....

Yes, I do have the image, only it is very dark. I can run an external screen, so the machine is fine otherwise. I looked at some of the forum backlight info, and did some measurements. I have nothing on PPVIN_S0SW_LCDBKLT, 0V. So it must be what generates PPVIN_S0SW_LCDBKLT. I 'll keep digging...

OK, I did throw the towel on the old logic board we discussed above, and bought a working one on Ebay. I know it is cheating, but wtf, I am a newbie and got tired of messing with it. Put in the new logic board,: it booted up fine for about 10 min, until I removed some fingerprints smudges on the...

Nevermind, she did boot up after all with my new logic board. Appears that the battery is fried and the machine will shut down immediately when I plug it in. The LCD screen was shaky, but stabilized and now is going without flicker....I am getting a new battery and call is a day.

OK so have to admit defeat. I gave up on the board and the zener diodes, just purchased another logic board and just installed it. Still no light on the charger, no boot. Could it be the DC in board which is causing my problem? I also disconnected the keyboard when trying to boot, in order to...

Another factor which MIGHT play into the crash of my freshly re-capped 2850 has come to light: The SSHD I had tried to implant into the machine had a " Logical Volume Group" Type, and a "Logical partition" format. Being the rookie I still am ( for the time being) , I am drawing blanks as to what...

OK, so I did another replacement of C9560 on a 2850 board, and it ran fine after with a fresh install with a High Sierra HDD. I used the cap I bought from Louis' store, the oversized unit, and also had replaced the trackpad, which had been the only error showing in ASD after the surgery. I was...

Thank you, 2informaticos. I was also considering replacing the infamous 2915 boards with the 2850, which are at least easily fixable, so my friends with the 2915s do not just have to sell it for parts. Albeit, I am keen on inexpensive parts....Anyways, most aspects seem to match the 2850, which...

One more question semi relating to this: Can the 820-2915-B board with kernel panic also be fixed by replacing the olde C9560 cap? The boards look very similar and might be interchangeable?

Oh yay, thank you, 2informaticos and JohnB, that FIXED it!!!. Without the battery indicator light plugged in everything is fine! Oh good, I needed a success for a change...I will switch the BIL from a donor and be on my way.

Oh, I think I misunderstood. I tested without BIL plugged in, after I removed the board. I thought with BIL you meant "Battery In Loup" instead of "Battery Indicator Light" , so I disconnected the battery and thought I followed your instructions. But I see now that you are referencing the J6955...

When no battery is in the machine I have the same battery symbol in OSX crossed out, same as when the battery is connected. The history is that there is no liquid spill detectable, machine works actually really well on AC, and is very clean inside. PPBUS_G3H at F7000 is12.63V w/o battery, reads...

This machine works fine on mag charger, but apparently has no connection to battery: will shit down when mag is removed. Tried new battery : same x through the battery symbol. I did the SMC reset, but it did not respond as other Mbps have done in the past. Basically ignored it, no changes on mag...