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got U7090 fixed. it was a bad solder job. Now PP3V42_G3H is stable. Still no green light. Moving onto U5110, I found that SMC_Reset_L - 3.315V however on pin 1 of R7100 I get nothing.

Short was found in the IO cable. Replaced it now I have the below readings on U7090: Pin 1 - 1.912 Pin 2 - 2.275 Pin 3 - 11.27 Pin 4 - 2.307 Pin 5 - 0.000 Pin 6 - 15.89 Pin 7 - 3.417 Pin 8 - 15.92

I do't have freeze spray. Tried alcohol method as well. Cant seem to find a hot spot on the board. It is all cool to the touch.

Injected 3.42V DCPS shows a current draw of 2 amps but I cant feel anything heating up

I have 0.253 on PP3V42_G3H, confirmed the circuit is shorted to ground. Removed U7090, C7098, C7099 and C 7094. Still short to ground. Any ideas ?

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 ?

Cpu_vccst_pwrgd - 1.012v

Found CPU_VR_EN missing dead PCH ?

I did ultrasonic cleaning already and inspected it closely. No more corrosion. Got my hands on a schematic and all power rails are present. Hmmm, you think liquid damaged the BIOS ?

No it does not.

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...

Confirmed R6905 had no continuity. Replaced it but immediately blew when magsafe plugged in.

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.

Solved. Board repaired, replaced U5110 from donor board. Thanks guys

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 ?