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U7200 3: 0v 6: 0v 8: 0v 13: 3.4v 16: 12.6v 17: 0v SMC_PM_G2_EN: 3.4v

Hi all, I have an 820-3115 that is having issues. Came in with no liquid damage, customer reported they were watching a movie and it shut off unexpectedly. I get intermittent green light but it only pulls 0.013A from the bench PSU. Found that PP5V_S3 was shorted to ground (0.30ohm) and injected...

Spoke too soon I guess - cleaned the area with alcohol and reassembled, and it worked fine for 1 boot, then when I rebooted the fans were at 100% speed and it was slow. While trying to hold down D and boot into AHT and find out what sensor was causing the issue, the board turned off and now it...

Luck was in my favor! It ended up being C6405 and C6406, they just barely heated up when injecting. Removed those and the board boots to the login screen. Will just need to replace from a donor and all should be well. Thanks for the help!

I will try to inject and see what I can find. I already tried injecting, nothing got warm but I didn't go higher than 1V, will try again 2 or 3 volts and with some thicker cables and see if anything warms up. The 0.122 to ground is on pin 2 of F7000, system side.

None of the big coils have the exact same value with with either red or black on ground. L8102 reads 0.102 with red on ground and 0.047 with black on ground. L7430, L7420, L7410, L7210, L7220, and L7270 all read 0.003 with red and black on ground. L7430 and L7420 both read 3.8 ohms in resistance...

Have a same model working board on the bench too, used that for measurements to compare. On the working board in diode I get 0.433 with the red on ground and OL with black on ground. On the patient board I get 0.122 for both red and black on ground.

I got that measurement at F7000. When I was first checking things I removed F7000 and found that with my meter on continuity mode, the side coming from the charger wasn't beeping but the side leading to the system was. I will compare diode mode readings against a similar board this evening and...

Thanks for that info on diode, didn't know that. After about 8 seconds the meter settled on 148 Ohms resistance to ground on PPBUS_G3H

Hi all, I have an 820-00850 on the bench that's stuck at 4.9V 0.33A on the charger. PPBUS_G3H is shorted to ground on the system side (meter beeps in continuity mode, 0.109 in diode mode on system side with F7000 removed). Measured resistance of all the coils around the CPU and got nothing under...

I have not yet, will try that and report back!

Hi all, I have an 820-01041 on my bench that's bootlooping. Tried without the trackpad connected, same issue. It will sit on the boot options screen forever without freezing or rebooting but if I select the internal drive's OS or an external drive with an OS it will show the Apple logo then...

Correct, the trackpad and flex I'm using to test work fine in another unit I have in. LCD flex is completely unplugged from LB, I'm testing with external video

This one is officially stumping me, have tried 2 known working trackpads/cables with all else disconnected and still get slowness/high fans

Update: Genuine charger stops working after 15-20 seconds of charging, but a knock off charger charges fine.

Very weird. Reassembled everything with the original battery the and it's charging properly now. Gonna test it over the weekend to make sure it's consistent but I think this is solved?! Thanks so much for the help! I feel like I'm slowly figuring things out.

I have 2 in my stock right now that I've tried, I get mine from Mobilesentrix so I'm hoping they're decent quality

Did not know that! I'll test again with a new trackpad and cable.

Oh I see, sorry. No, the light doesn't fluctuate, it stays solid amber after turning from green. The board does not turn on with battery alone, and while running with battery and charger if I disconnect charger the laptop shuts off immediately.

Tested with just the logic board itself outside of the case plugged into external mouse/kb/display with LCD connector removed. Same laggy mouse and very slow unfortunately.