It is hard to diagnose this problem over the internet. If this came across my desk here is what I would do. I know you have completed some of these steps.
· Remove the logic board and install it in a known good housing including a known good screen and battery. (If it boots you know it’s a parts issue)
· Take a diode measurement of the PP_VCC_MAIN line. (A partial short on the 6s plus can cause your issue)
· Try an update.
· Put some pressure on the CPU while booting.
· Check the PP1V8 has correct voltage.
· Replace the Tristar IC.
· Check the logic eeprom.
· Check Baseband PMU and CPU on the 6s plus if they are faulty it will produce your problem.
If the update you performed was successful with no errors I would be inclined to say that the NAND and CPU are okay but you would need to check the power rails on these in case there is a partial short.
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