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Back to this board. Yes, sense resistors and traces are all ok. So just to make it clear. PPBUS_G3H goes up to 12.56 it's there for 2 sec and collapse. I believe the problem is that the PP3V3_S5 rail is all over the place. There is no short on the 3.3V rail. However if I heat the board just a...

Hi, I've a liquid damaged 820-3115. The liquid damage was around SMC and PP3V42_G3H. I had to change the SMC, because there was no green light. After I replaced the SMC this macbook was working fine. However after few hours it turned off and the green light went off. There was a short on...

When it's fluctuating its between 12.55V - 12V on the scope. The thing is that it's not always fluctuating. Sometimes it just goes down to 0V.

Yes, looks like those are stable even when it's not turning on. PP3V42_G3H - 3.4V SMC_RESET_L 3.2V SMC_PM_G2_EN 3.3V I also have the 3.3V(P5V3V3_REG_EN) on U7200 all the time.

Hi guys, I've a 820-2879 here with a power problem. This one is not liquid damaged. Lot of dust in the computer, but no liquid damage. The problem is that it turns on sometimes and it works ok, but lot of times it won't turn on. Some measurements: When it's not turning on: PPBUS_G3H - 12.55V...

Hello, I've this board here with the on/off loop problem. No liquid damage. PP5V_S0 present when it tries to turn on for a sec. Fan spins up. Every power rail comes up for a sec except CPUVCORE. I tried different BIOS. I've 1.2V on on Y2605, but I can't see it oscillating. I changed the...

Well, I received the parts board for this board. I changed the SMC with the correct one, but still no power. I lifted all CPUVCORE coils at the CPU side and checked them if I have anything on them without connecting it to the CPU. With multimeter is show 3V which is extremely high. I checked...

Definitely no liquid damage. I tried different BIOS, but same thing. I've two same non-working board here for parts. I also tried those BIOS on this board. Nothing changed.

Yes, I checked RTC signals. I forgot to mention it in my first post. No short on PP5V_S3 over 20k ohm. Edit: I've also PP3V3_SUS - 3.3V PP1V05_SUS - 1.05V

Hi, I received this macbook with not turning on issue. No liquid damage. The board was pretty dusty. But no sing of liquid damage. When I press the power button the fan spins up a little bit and that's it. It does not do the on-off loop. Here are the measurements: PPBUS_G3H 12.57V PP3V3_S5...

Yes, The CPU VCORE comes high for a sec. Well, hard to tell what the voltage is on Y1905. I got a very weird wave on the scope. Multimeter jumps up around 1V for a sec. Hard to tell. I changed Y1905 and U1900 same thing. I've one more exact same board almost with the same problem, but that one...

No, USB mouse does not light up. I did some heat and flux on SMC,PCH,CPU. Nothing really happened.

Solved. C916 was cracked. There was no short, but pulled down the line. I thought ceramic caps are can't leak.

Hi, I got this board with a no backlight issue. No liquid damage. It shows the question mark. Just no backlight. I tried different monitor with different LVDS cable. I changed the LVDS connector on the board. I changed the LED Driver. I bought one from L2. I thought it was bad so I ordered few...

Hi, I'm trying to fix a liquid damaged 820-3476 board. After the cleaning I got green and orange light on the charger. U7200 was correded. I changed it. The board still does not start. The fan does not spin up. I have: PP3V3_S5 PPBUS_G3H 12.56V PP3V3_SUS PP1V05_SUS PPVRTC_G3H PCH_CLK32K...

It should be there. Someone ripped it off.

Hi All, So I have this nice Retina here with liquid damage. I cleaned it. Battery is dead. It was powering on, but no CPU VCORE. I checked the power to U7200 and I saw R7202 was corroded. I changed it and it turned on for a sec or two and turned off. PP3V42_G3H was 70-80 Ohm short to ground...

Hi, I got this Air here. No water damage. It has a damage on the side where the USB port is. I took a photo of it. Just the case damaged. The USB port and the logic board is not! The right side speaker didn't work. The AMP(U6410) was dead. No liquid damage. Sometimes it hangs on boot. Just...

He has the same crap as the others. I recently ordered from him 10 keyboards with backlight. The keyboards are OK, but the backlights are garbage. Same with the retina batteries. The first two were good. The last 3 were crap. One charges up, but as soon as it goes above 9% the macbooks shuts...

Yes, the board stays on and the CPU Vcore is present. It's 0.9V. CPU gets pretty hot after a while. PCH hot from the beginning.