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Finally got some parts in. Replaced the buck converter and tested - voltage is now steady and not pulsing. System is charging. Laptop boots and appears to be working as it should! Thank you for all the help!!

So I was looking at TPS51125 I have a steady 12V coming in on pin 16 but I have a pulsing 3.3V out on pin 8 and a pulsing 5v out on pin 17.

I will take a look at those tomorrow. What do you think of buck converter U7200 being an issue? There is slight evidence that water was around this chip (rust like discoloration) and I am wondering if it caused some problems within. I ordered some chips and figured I could change it anyway...

Resistance to GND on 3V3_S5? = Diode mode says .142 S5_PWRGD pulsing too? = Yes, pulsing when magsafe connected, not pulsing on battery only.

5 o'clock came around, I will update tomorrow. Thank you for the help!!

PP3v3_S5 is not stable. https://www.dropbox.com/s/g5co7zp819tkcsc/Video%20Nov%2008%2C%204%2055%2011%20PM.mov?dl=0

Fan connected, not spinning. PP3v3_S5 pulses 3.3V PP5V_S3_Reg V=0

PPBUS_G3H With Batt, V=12.58 Without Batt, V= 12.58 SMBUS_BATT_SCL With Batt, V= 3.45 (not steady, (fluctuation) drops down to 3.2 but mostly is at 3.4) Without Batt, V= 3.45 (not steady, (fluctuation) drops down to 3.2 but mostly is at 3.4) SMBUS_BATT_SDA With Batt, V= 3.45 (not...

I have a Macbook (820-3115) that came in "dead" and the customer states that a "whole bottle of water is in there." It does not turn on, no chimes, no fan, nothing. Battery LED meter on the side shows the battery at about 50%. MagSafe gives me a green light but never changes to orange (always...