Switch V1 Erista - Strange issues

Hi Guys,
got a V1 erista with a Black screen after Nintendo Logo.
RCM works to start hekate and check battery Info that Current was only 1000mA. Try to change the battery, same issue. Replace the 17050 max ic on the back, same issue. Console stucks still after Nintendo Logo.

Replace USB Port and MT92. Remove Pi3 for sure. Same issue, but console charging.
Measure some things on the Max77620 and VDD_1V0 has only 0.79V. Replace the chip and VDD_1V0 has now 0.99~1V. All other voltages are fine.

But now, when i try to connect it via RCM on pc to inject payload, i got nothing, No RCM with and without EMMC. Emmc and SOC got power. No other shorts found.

Install a picofly in it and got ** - Reset noch connected error. Is it possible that the console is permanently in reset mode?

Anyone any idea?

No one any idea?. Hope i can fix the switch.