Need help with diagnosis - Hac CPU 20 - SOLID YELLOW(not orange) screen - no hekate - charges with .47amps

-checked for shorts.
-its not the emmc as also hekate doesnt start without emmc. pc recognizes the mainboard but tegra rcm gives 0x0000 instead of 0x7000.

  • nothing unusual. no cracked ics etc.
  • case looks very good. no dropdamage etc
  • usb port looks also good.
    -amp meter show .47amps charging

how would you proceed to diagnose this? THX!