Re: 820-00840 / No boot / PP3V3_G3H Short to ground

Thanks for your reply mon2.

Board is alone on my desk since the beginning, nothing plugged on it.

Keyboard connector looks perfect, nothing special.

However, values are below :

Resistance from pin 15 to ground => around 2,6 ohms
Resistance from pin 16 to ground => around 0,9 ohms (same as shorting my multimeter)
Resistance from R6999 (pin 2) to ground => around 2,6 ohms

So Pins 15 & 16 aren't shorted together, connector seems fine.

Re: 820-00840 / No boot / PP3V3_G3H Short to ground



Yes of course, excuse my mistake. It's lines PP3V3_G3H_UPC_XA & XB

So i remove the tinyyyyyy R3000 and 3001, one by one.

Short is gone on PP3V3_G3H_UPC_XA and XB, so i suppose U3000 & U3001 chips are fines.

But short on PP3V3_G3H is still there !

I remove R6999 to be sure again, but no difference...

With schematic, i'm a little bit confused what to test after that....

Hello everyone,

Firstly sorry for my english, french guy inside.

I brought a macbook pro A1708 - 820-00840 logic board, wasn't powering on.
History is a day, nothing happened when opening the laptop.

Nothing special inside, no corrosion, no liquid damage, never opened.

First, with the logicboard alone on the desk, mesures are :
5v017 and 0.000 amp. nothing else.
Finding a short on the PP3V3_G3H_VR, but not on the PP3V3_G3H (0.540 on diode mode), PPDCIN_G3H_CHGR_R present (5,1 volts) PPVIN_G3H_P3V3G3H around 4.1 volts. PM_EN_P3V3_G3H...

Re: New Members - please post your introductions here

Hello, i'm a french guy with little skill in solder and find solution for every problem i found... but i'm just a human, so sometimes i need other humans to help me finding a solution, or just take a beer