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As i had the wire soldered to the TP on that line and could "turn on" the backlight with my finger i measured some activity. No straight dc voltage, but pulses. But that was in mV scale and they were just a few us apart...

I have no working one but i compared it to some similar boards i could not fix ( with CPU, SMC... on them) and the only difference is that the dataline (Pin3 U5750) has a resistance to gnd as on the working board without KBDBKL i get OL (i removet the 10 MOhm resistor for mearurements). The...

I searched on all of my boards and could find a single 10 MOhm resistor in the crystal circuit of a older iMac board. But unfortunately still no change. control keys and light sensor work fine but its still stuck at 5 V... So if U5750 should give a path to GND could it be that both chips (i...

I put a 1 MOhm resistor there but still no change. I try to find 10 MOhm but i guess i need to order a few...

Sorry for that question. I cant find a 10 MOhm resistor.... Can i use a 1 MOhm resistor instead? Or could you gibe me an example of a board that has a 10 MOhm resistor on it that i could reuse?...

Something really interesting is happening. As i need to measure at the back of the board and also need to plug a lot of stuff into it to orfirm control keys activity (LCD, USB-SSD, TP & keyboard, Backlight battery etc...) i soldered a wire to TP[1]SMC_SYS_KBDLED and run it around the board...

Thank you. I?ll get a stronger power supply soon and will try again.

I did a lot of testing and as fas as i understand the SMC dataline should be 0V is KBDBKL is off and 3 V to 3.3 V is on (depending on brightness and just in a OS). So 0.18 V is no valide state. Diode mode readings are identical with 2 other boards... Is it safe to put 3.42_G3H there and enable...

I injected voltage but i cant find anything heating up except my power supply cables after some time. I set it to 1.5 V and 5.3 A (max) and if i turn it on voltage drops to 0.7 V and current stays at 5.3 A cause its current limited. CPU and PCH stay cool as metal. Nothing really gets warm...

Hello, this 820-3209 was waterdamaged and dead. I fixed it (including a new SMC) and now everything except keyboard backlight works fine. If i dont cover the light sensor i cant adjust the kayboard backlight brightness. If i cover it i can lower and raise the keyboard brightness. So i guess SMC...

I ran a wire and not the 5V make it to U7801. I am still a bit confused. Sorry for that dumb question but according to page 7 PP1V5_S3_P1V5S3RS0_FET = PPDDR_S3_REG = PP1V5_S3. And PP1V5_S3 is the missing rail. So i still didn?t got that right... I lifted L7330 and the short is on pin 2. Pin 1...

Thank you. R7402 iscorrect 91.1 kOhm (should be 90.9 kOhm) U7801 has no voltage at pin 1 (VIN) and pin 5. C7205 pin 1 is not connected to C7801 pin 1 as it should be (not beeping). So i think that that could be one problem here as these two should be directly connectet according to BV and...

Hello, this 820-3032 is dead. I noticet that the cpu is getting slightly warm after some time (i guess thats because PPVCCSA_S0_CPU, PP1V05_S0 and PP1V8_S0_CPU_VCCPLL_R are there but VCORE_S0_CPU, VCORE_S0_AXG and PP1V5_S3RS0 are missing). I checked powerrails and came to a point where i got...

Ok i keep testing it. I let it run tests (i tested also with external monitor attached) all night and no issues so far. Since i took apart the device, cleaned it and put it back together it seems to work - atleast for now. So i keep testing it but i can remember that i could trigger the problem...

R7430 is correct. I gave CPU a reflow same way i do with 2011 MBP/iMac GPU issues to test if its really a GPU problem but that did not change anything aswell... So i think its time to give up here...

Hello, i have a question regarding the 820-3787 boards. I saw this a few times already so i am curious if somebody know what causes this and how to fix it. This 15" Retina late 2013 works fine but sometimes it shows glitched video. Something like a "splitscreen view" of the same picture on the...

Is there something else i could try?

Yes it stays on with everything except monitor connected (+USB mouse and pen drive). It starts, chimes and even talks to me after few seconds if i plug my Mavericks USB drive in (it has the voice over thing enabled...)

Ok i flash original Bios back. Yes, it only starts with both monitors disconnected. If there is any monitor plugged in (internal or external) fan just twitch one time. After the fan twitched i can hear a quiet "brumming" sound from the fan and can feel it vibrating until i unplug battery...

I tested the file from the other post you linked me to but still the exact same issue.