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I assumed pins 1 and 3 were on the connector that was on the trackpad but from reading the schematic it says its on the bottom side of the logic board which means I would need to disconnect the battery and measure under the board.

U3310 didnt look like it had any liquid damage to it. I removed it and still made no difference and I also removed U3210 but that didnt solve anything either. R8178 isn't showing as shorted to ground in diode mode. Diode Mode: Pin 1 of R8178 is around 0.47v and Pin 2 is around 0.53v C8186-88...

This board I received had liquid damage and after replacing some components and ultrasonicing the board it would power cycle, pm_slp_s4_l would pulse for one second on startup and there was no 5V_S3/0 voltages. I had to search around for a long time and ended up seeing that L4605 and C4695 were...

I don't understand. I gave the measurements for even pins from 2-40 and I thought the odd numbers from 1-41 where the previous measurements I gave from the connector that is on the trackpad. Where are the other half of the pins so I can measure them and do I need to keep the trackpad flex cable...

Okay I separated the trackpad and took these measurements with both the trackpad flex and keyboard flex plugged in. J4801 Pin 40/38/36 - 7.64v Pins 34/32/30/28 - 0v Pin 26 - 3.27v Pin 24 - 5v Pin 22 - 3.3v Pins 20/18 - 0v Pin 16 - 3.3v Pin 14 - 4.98v Pin 12 - 0v Pin 10 - 3.28v Pin 8 - Pulses...

The reason I'm saying that is because I have to measure on connector that is on the trackpad since I can't measure the logic board connector and have the cable plugged in at the same time. I got these measurements from the connector that is on the trackpad. (J4801) Pins 1/3 - 8v Pin 5 - 0v Pins...

Okay I believe I read the schematic right on J4801 that the side where Pins 1/41 are on can be measured from the connector on the trackpad board. If so all the pins gave me correct readings except for Pins 7,9,35,37,39,41 which all gave me 0v. I measured from left to right and the first two...

Okay. I already put in a new trackpad & cable from ebay which is why I don't understand how the trackpad is still not working for me.

So the keyboard is like the airs where its riveted to the case and you just need to rip it off? I don't want to order a keyboard only to find out that the trackpad or keyboard still isn't working. I'm curious why my trackpad isn't working even with the keyboard not plugged in. Also, is there a...

There was nothing left of the fuse except for pads which I jumpered together. I disconnected the keyboard cable from the trackpad but I'm still not able to move the trackpad. I can tell the trackpad is somewhat working because when the machine is on I can feel the trackpad is clicking which it...

I have this 12 inch 2015 Macbook that had liquid spilled on it and the keyboard flex cable was damaged. The trackpad had lots of corrosion on it but not much on the logic board even though I haven't been able to completely remove the logic board since I'm missing the Y00 driver bit. I replaced...

Do you think this could just be a software issue since an smc reset got it working for a few hours?

I received this machine from a customer that shows there is no wifi hardware installed. He doesn't think there was ever any liquid damage since he bought it from someone else. I haven't taken apart the board to inspect but he said he did an SMC reset and the wifi worked for a couple of hours...

The machine is now working and all rails are present I was just asking to keep as a mental note

But what about when I getting cpu vcore but the machine wasn't chiming or the screen wasn't turning on. Could Q7310/11 caused that?

Okay so Q7310 didn't look too well on the Pin 5 side so I replaced it along with Q7311 for good measure and now it turns on and runs perfectly fine. Thanks Do you have an idea how that could have caused these issues?

Alright with no external components plugged in I measured PM_SLP_S4_L as soon as I plug the charger in and I saw it show 3.4v for a quick second. Do you know what would usually cause it to pulse like that? I did replace u1900 and u1950 when I was first diagnosing the board so I'm not sure if...

okay I didnt know the trackpad has to be working for the kbd to work. I plugged in my usb mouse again and I got no lights so I went and checked voltages again and found out there is no vcore or s3/s0 rails. 5v_S5 is present so now I have to figure why the rest of them aren't. As far as the usb...

Okay I plugged in my spare keyboard and did the pram reset but nothing happened. I'm pretty sure the keyboard is working because I measured the kbd connector pins as I clicked the option key and the control key and they both went up to 3.42v as I pressed them. I also tried to do the smc bypass...

Okay. The usb mouse was lighting up but I didn't hear any chime.