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Hi guys. Working on a 820-00138 board with liquid damage. No green light on adapter. Cleaned up and replaced U5110 and surrounding components. PPBUS_G3H - 12.26v PP3V42_G3H - 3.409v SMC_BC_ACOK_VCC - 3.409v SYS_ONEWIRE - 3.387v Made sure I am using original 85w Magsafe 2 however I only get...

Hi Guys. Working on a 820-3115 with no power no green light. Liquid damaged in the U7000 and Q5480 area. I replaced both of those components and surrounding caps/resistors. Found a short on PPBUS_G3H that I tracked down to CHGR_PHASE on Q7035, when I removed it the short went away. I also...

Hi. I am working on a 820-3476 board with no power. All S5 rails are present but missing S4 and below. I found that PM_SLP_S4 is missing so I traced that back to the CPU. Found that PM_PCH_SYS_PWROK is missing. Checked for ALL_SYS_PWRGD is missing as well. Based on schematic, this signal is...

Hi All, I am working on a Mac Pro 2013 model that is not posting. I found a single corroded component on the CPU riser card that I believe is the culprit. The problem is, I have no board view, schematic or donor boards available for this machine. The component is in the bottom left vicinity of...

I have a 820-3662 that suffered liquid damage. The unit was badly liquid damaged in the eDP connector area, audio and thunderbolt. I removed the damaged components and soldered a new connector. The unit powers on a works fine except the fans always spin at max RPM but only after the OS is...

I have a 820-3476 with no power but orange light on magsafe. Tracked it down to a short PPBUS_G3H under Q7630. When I removed the component, the short is still present and there seems to be soon peeling of the upper layers on the board. See attached picture. Is it salvageable ?

I have a 820-3437 with no power button. The unit powers on when the charger is connected with the battery plugged in, light goes amber, fan spins and stops 3 times then the system powers up and works as expected. I cannot turn it off or on using the power button. I disconnected the IPD Flex and...

Working on a 820-3115 with no trackpad. Found that PP18V5_Z2 is missing on the connector, confirmed PP3V3_S4_TPAD is present. Traced it to U5805 and found the following readings. 1 - 0.053 2 - 5.07 3 - 0.000 4 - 0.185 5 - 0.001 6 - 0.000 7 - 0.000 8 - 0.037 So I replaced it but having the...

Found PP3V42_G3H missing on U7090. Confirmed it was being powered on pin 6 - 16.5V. Replaced from donor, still no PP3V42_G3H. Any ideas ?

I have a 820-4924 that is liquid damaged. It looks pretty good as the customer brought it quickly. However it is not powering on. Since I do not have a board view for this board, I am not sure where to start. I did an ultrasonic cleaning in the crest but that hasn't helped.The problem is rather...

Working on a 820-2879 with no green light PP3V42_G3H is missing. Not present at U6990. I have PP18V5_DCIN_CONN present before Q7080 and Q7085 but I am having a hard time understanding how these create PP3V42_G3H and what my next step should be. The board has been liquid damaged.

Board has no green light. SMC_ACOK is present on U6900 and U6901 while SMC_Reset_L is low 0.4v at U5010. Any ideas ?