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Post diode mode reading at 1V25_S2; red probe on ground. Also post the value in reverse way, with black probe on ground.

A complex communication, according Power Delivery protocol is required between MacBook and charger. Do you get 1V25_S2? Did you change U8100 & U7700 without checking if all their LDOs are present? Try to put the machine in DFU with DFU Blaster, or using external switch method.

Ooops, VSS is a ground point! Looking at page 39 you can see a lot of VSS pins; where they go??? In general, in electronics, VDD and VCC are labels for positive power supply designation. VSS and VEE are used for ground, or negative power supply.

Do you still get 1 minute image? Check what happens in recovery menu. Can you choose Share Disk there?

Check R/C7030/40 and their traces. Replace Q7030/40, just in case. Keep F7000 removed, until you get C7050 voltage.

Check DP_INT_HPD; LCD connected. Also check diode mode at J8500's pins 1 & 3. BTW, do you get external video?

Test disconnecting lid sensor.

Try reflashing TBT ROMs; at least right side. Check CHGR_RST_IN and UPC_PMU_RESET_1V2/3V3; with charger alone. Also check UPC_I2C_INT_L y UPC_SMC_I2C_INT_L.

What about U8100 and U7700 LDOs? It is recognized in DFU mode?

Do you get 3V3/5V_S0SW_LCD?

Is there internal image for sure?

Try with trackpad and battery connected. If still fails, SSD itself may be the culprit.

Now try DFU...

This points to bad NANDs. Very low chance to have a leaky capacitor.

Got fan spin in normal mode, or SMC bypass?

Check diode mode to ground at 1V25_S2. Be sure R770F is good. You may need to replace L77D0.

Ooops, you're right, this is T2 machine. ISL9240 can generate PPBUS_G3H by itself. ISL9239 from old T1 machines can't do that. CHGR_RST_IN with 0V is OK; we don't want active reset signal. Check resistance (ohm scale) over C7020/23. "VDDA and VDDP voltages are 0V on both sides R7075" What...

You may have lot of damage on the board now. Replace U7600 and pray! Be sure R/C7609 are both good; as their traces too.

Short 3V3_S5 to ground and test again DFU revive.

Not a short, but very low value. Injecting voltage will not heat anything; unless thermal avalanche occurs, which is very low probable. Lift L9020/21 and R9020. Check where the low reading remains.