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Does the entire metal shield have to be removed to see the T2 or is it partially open when the black sticker is removed?

Yes. What I meant by "no sign of life" was on the USB. Nothing shows up in AC2.

Weird, I can't get any sign of life. I tried USB-A to USB-C, both ports, with and without plugging charger in. Also tried connecting SE032 pads. Then tried USB-C to USB-C (12" Macbook Retina), with and without charger, SE032 pads.

I'm doing all testing since the beginning with the board only.

So, connected to computer USB, input showing 4.91V, 0.3955A stable. PPBUS_G3H 12.26V stable PPBUS_HS_CPU 12.26V stable PPDCIN_G3H 4.69V stable PP20V_USBC_XA_VBUS 4.87V stable PP3V3_G3H_RTC 3.30V stable PP3V3_G3H 3.23V stable PP3V3_AWAKE 3.23V stable PP1V8_AWAKE 1.8V stable PP1V2_AWAKE 1.2V...

All of the MESA lines are mOhm, a few kOhm, but nothing to compare to. I tried connecting the board to another Mac and interestingly it takes 4.91V and stable 0.45A (about 2W). The only areas that get warm are under the can (U3900, northbridge?) and L7030 (CHGR_LX1), but nothing around CHGR_LX1...

Any way to make sure?

Yeah, looks like very slight corrosion. The liquid sensor is red. I don't see anything else that looks bad/corroded.

Sorry, I misunderstood. Going to check the audio board in a bit.

I'm doing all this with the logic board out of the case. Nothing connected except USB ports.

This is what PPBUS_G3H looks like:

PP1V2_S3, PP1V8_S3 nothing PP1V_S0SW nothing PP3V3_TBT_X_S0, PP3V3_S0SW_LCD nothing PP5V_S0_BKLT_A, PP5V_S0_BKLT_D:

The only coils near short are the CPU coils at around 3.4ohm, PVCCEDRAM around 30ohm, PVCCIO around 70ohm.

3V3_G3S, 1V8_G3S both power cycling (can barely see blip with multimeter, would have to test with scope), both kOhms to gnd. PP3V3_AWAKE 3.25V shows for about 1s, then 0 for 2s. PP1V8_AWAKE, PP1V8_SLPS2R same, 1.8V for 1s. All mOhm to gnd.

Hi guys, A2159 with very minor liquid damage, most likely water. Cleaned in the ultrasonic twice. No components are visually damaged, badly corroded or burnt. There were smoke traces of 20V short on the USB pcb connector. Before cleaning there was no PD negotiation (5V, 0.4A). After cleaning...

Could anyone recommend how to remove chips on these boards? I have never had so much trouble trying to remove a part. I have one of those Chinese hot air soldering stations. I use it to reflow personally designed new boards, but I use leaded solder paste. 360deg C is usually sufficient. I...

That makes sense. I'll replace the chip. Thanks for your help thus far.

Tried bridging the two and still not getting any S3.

Yeah, but I want to confirm I get somewhere if PP3V3_S4 is high, in case I need to order any other parts.