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Have a MacBook that came in for a battery replacement. Device presented just fine overall. After powering on the system with the new battery installed the CPU fan runs at max speed no matter what. I've attempted another battery, I've attempted a new CPU fan and also attempted a new Trackpad &...

Ran memtest from a USB and the system passed. So failing processor? Edit: CPU stress test from Prime95 had no issues. After starting Heaven GPU test I started getting artifacting in the OS. So GPU part of processor does appear to be failing.

I have a MacBook that came in for a screen replacement. The original screen was not visibly damaged but was producing thin vertical lines in select parts of the screen. After replacing the screen there is weird artifacting that occurs in the loading screen and recovery mode screens. When loaded...

Have an 820-00840 Board. History of device is that it was working fine and then no longer powered on. System boosts to 20V when plugged in, but only draws 2-10mA. PPBUS_G3H - 13.05V PP3V3_S5 is fluctuating from 0-3.3V in a 1-2 second cycle. PP3V3_S5 is not shorted to ground. Visual inspection...

No, I attempted an 'Erase All Content & Settings" restore from system settings when it was booting fine. During the process of that it came back to the Apple Logo and then stopped doing anything beyond that.

I was able to get the machine booted several times without issue. I extracted data to a time machine backup and transferred files to a USB without issue. However, after attempting to reset the device, the system now hangs at the Apple Logo. No loading icon, nothing. Just boots up to apple logo...

Would it be easier to boot it into target disk mode and extract data if data is the only goal here? I just am curious if target disk mode is less resource intensive in a way that relies on less of the board to be functional versus it fully booting into the OS.

Resoldered F7000 after checking PPBUS. I get boost to 20V now. Have to wait for a new keyboard and battery to arrive as the customer's was no good. Will have better update once it arrives.

Replaced U7000 from donor board. New U7000 Voltage readings: P_IN - 5.087V AUX_DET - 1.263V SMC_RST_IN - 0V VDDA - 5.158V VDDP - 5.158V EN_MVR- 5.160V AMON - 0V BMON - 0V Voltage Readings around U7000 now CHGR_CSO_N - 12.28V CHGR_CSO_P - 12.28V CHGR_LX1 - 0.532V CHGR_LX2 - 0.532V CHGR_BOOT1 -...

Will replace U7000 as reading is still low. Am I wrong in it being "V"? I thought it was measuring voltage drop. Does U7000 have to come from donor board or will brand new IC work? Just not sure if chip is programmed by any means.

Sorry for the delay. (Red probe on ground) C7075 - 0.136V C7077 - 0.460V

These are readings without f7000 installed. Whatever caused me to have the voltages present is no longer functioning properly. PPBUS_G3H Diode Mode to Ground - 0.481V

So I had those readings. Unplugged the board and walked away. Now when I plug in the board I only get a 15-20mA draw. VDDA is only 2.3V now. VDDP is only 2.6V now, resistance to ground is 171 Ohms. EN_MVR is 0V, resistance to ground is 4.520 MOhms Measuring across R7075 i get 4.8 Ohms U7000...

Replaced R7075 as well as a few other poor looking caps by it. Now I have 5.062V on VDDA/P as well as EN_MVR U7000: P_IN - 5.087V AUX_DET - 1.263V SMC_RST_IN - 0V VDDA - 5.062V VDDP - 5.062V EN_MVR- 5.062V AMON - 0V BMON - 0V System is now at 5V drawing ~100mA instead of 2-5mA Voltages around...

Can you tell me what reading I should expect on C7020? Edit: Fixed broken trace under R7060, now have 2.7 Ohms across C7020. Now U7000: P_IN - 5.087V AUX_DET - 1.263V SMC_RST_IN - 0V VDDA - 5.062V VDDP - (-0.080V) EN_MVR- 0V AMON - 0V BMON - 0V No cycling now C7020 - 2.7 Ohms C7023 - 2.3 Ohms

how? I changed C7020/61/62 but still have the same resistance present. Do I need to remove the ISL chip? Or do I need to step back and replace Q7040? Edit: Replaced Q7040 still no change. Thinking to pull the ISL but don't want to if I'm looking in wrong area. R7061/62 measure good.

U7000: P_IN - 5.087V AUX_DET - 1.263V SMC_RST_IN - 0V VDDA - 5.062V VDDP - (-0.069V)? Black probe was on ground but still got negative symbol. EN_MVR- 0V AMON - 0V BMON - Starts @ 0.893V, drops to 0V within a second or two. Repeats. C7020 - 493.6 kOhms C7023 - 2.3 Ohms

Sorry, didn't think that was a big ask when it comes to board help but will make sure to change that when posting in the future. @ C7050 with the Fuse removed I get a cycling voltage from ~2V down to 0.9V then back up to 2. Would say it's a 2-3 second cycle.

Macbook A2251 came in for liquid damage. After inspecting the board there was noticeable corrosion on the motherboard around the battery connector area. Board was ultrasonic cleaned. After cleaning a short was found on PPBUS_G3H. Injecting voltage showed U7600 was shorted. Replaced from a...

I have not tested the board without as I did not want to risk any sort of damage with them missing. I know shorts are cleared at minimum but will have to test later today.