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@Askaleto that was my first thought too - just measured voltage on the pins of U5850 and compared them to the values on the pins of U5870 for the thermal sensor of the CPU. They lookes very similar.

Testet it with no webcam but didn't changed anything. Now it works sometimes and Heatpipe Temp Values look good (GPU2 still at 130°C but system is not slow and fan spin goes down to 2k rpm with low Heatpipe values) most of the time but it still jumps sometimes from 30°C to 130°C... Already tried...

i forgot the most important fact :-D The MBP is running slow / stucks with increasing fan spin (up to 6k rpm).

Hey there :-) I'm working on my first sensor issue and don't really know where to start. HWMonitor says GPU2, Heatpipe incoming air & Heatpipe outcoming air 129°C. Any suggestions where to start searching? The board looks perfekt - no signs of liquid or anything - it was just a little dusty...

I found out the board is turning off every time i try to measure voltage on CPU_VR_PGOOD_R. What could cause this behavior?

*Restoring not resorting :-D

Resorting the broken trace worked - ppbus was stable then. Had a problem with backlight data line too because of another broken trace but now everything works fine - thank you! :)

Heating PCH with flux didnt't helped. Sometimes I'm getting PLT_RESET_L but there is still no USB activity if it is present

Don't know much about this board - some corrosion around U3210 and U3310 - but nothing too bad. I changed C7125. Measurements on U7100: Pin 1: 0.04V Pin 2: 18.3V Pin 3: 4.4V Pin 9: 0.3V Pin 12: 0V <- PP3V42 is present at other points - maybe a broken trace? Pin 14: 3.4V Pin 15: 0.02V Pin 17...

Hey, I'm working on a MBP (820-4924) with fluctuating voltage on PPBUS. When I plug it in I got 12V for a moment, slowly dropping to 0.4V. I got a green light on the charger, PP3V42_G3H is stable. CHGR_DCIN is okay CHGR_RST_L is okay. Current sening seems okay. I already replaced U7100 and...

CPU_VCCST_PWRGD: 1.02V PM_PCH_PWROK: 3.42V PM_PCH_SYS_PWROK: 3.42V How exactly the board behaves (LCD connected only): Fan starts spinning, board is taking~250mA, fanstarts to run faster for a mement, then amperage drop back to 25mA. After few seconds it powers on again, running on 300mA. But I...

already tried a known working BIOS and replaced U6100

Hey, I'm working on a 820-00165 that is struggeling turning on. I have to trigger SMC_ONNOFF_L several times until it powers on (same in SMC bypass mode). When I'm lucky and it turns on I have no USB acticity and no display. CPU Vcore is present (1.7V). PPBUS_G3H: 8.6V SYS_PWORK_R: 3.42V...

Same behavior after heating PCH

pin 3/U1950: pulsing CPU_VR_READY: pulsing PLT_RESET_L: 0V

With SMC bypass I get pulsing short fan spins.

Hey there :-) I got another 820-00165 with some problems. It is in S5 State and nearly all other power rails are pulsing: Lokked like someone else already worked on this board before. But no signs of liquid damage, all probe points look very clean. The Board is taking 24mA - sometimes dropping...

Just did the resoldering and the pram reset but no changes.

@2informaticos could you solve this problem? Got a board with exactly the same behavior.

Hey, i got a 15" MBP (820-3332) with no display an no backlight. PPVCORE_GPU looks fine (1.06V) but LCD_PWR_EN is missing (no short to ground). I got USB activity but no image on external display. Could it be a faulty GPU? Thanks and best regards