Need help with diagnosing this problem
820-2936 no power,magsafe green, fan spins for a second then stops then repeats. Board is liquid damaged and when I got it I was not getting any ppv5_s5. Replaced u7200 and c7273 that was shorted

All rails ok until I get to pp5v_s3. if I watch the MM, it jumps to 5v then straight to 0v. In diode mode does not show any short to ground but Im obviosly missing something

Thanks

Re: New Members - please post your introductions here

Hi all
I rich from the Uk, found the forum while googling so hoping to tap into some expertise. Ive worked in the tech industry for 20+ years now doing various things. longest jobs have been in industrial print developing print presses/ inkjet technology. started off years ago repairing at board level early 8086/88 PC's etc and Im just staring to get to grips repairing macbooks as a pastime after being the go to family person to fix "stuff" for a while. thought I may as well make some pennies from it!