2021 14” pro A2442 coffee damaged ppbus short 0 ohms

[posarah]

Hi all,

we’ve got a 2021 MacBook Pro 14 inch in with coffee damage. There was not really any corrosion luckily just a bit of sticky residue over the passives around the hdmi area. I cleaned all that up checked and there seem to be no shorts on the areas with the liquid residue. Caps aren’t shorted, inductors seem fine and resistors measure how they should.

However there is a zero ohm short on ppbus_aon. 0.1v diode mode on pPbus measures at CR857.There is no further signs of liquid/damaged components on the board, and where there was liquid is no where near/ and is not connected to pPbus_aon so that’s strange. Is there anything else I should be checking before connecting the MagSafe and going down the power sequences?

I’ve attached photos of the liquid damaged areas,apologises for the quality my phones cameras not what it used to be.

thanks!

 

[2informaticos]

"there is a zero ohm short on ppbus_aon. 0.1v diode mode on pPbus"
Please post accurate information.
0 ohm and 0.1 in diode mode is not the same thing.
0.1=0.100 in diode mode can be 80-120 ohm, depending of multimeter used.

Don't write "V" at the end of diode mode reading.
Avoid confusion with voltage measurment.

If you really have resistance to ground close to 0 ohm, on PPBUS_AON, then check if any big coil gets the same reading.