Not even light up the display board diagnostic, totally dead.

check stanby power

the power supply is OK?
the power button is 3 or 5 Volt?
LAN is hot?

replace lan chip (disconnect for test first)

Diagnostic board code FF00, reset always on, clock signal flashing, processor with heating, normal memory voltage at 1.8v approximately. South bridge without heating and also without tension in the crystal of 32,768mhz . Attempt to replace the crystal without success.

Vcore voltage without processor is 1.1v
voltage of memory is 1.85v