I check power supplies.
Analog: 12v, -5v, +5v - ok
Digital: 1.25v, 2.5v, 1.2v, 1.8v, 3.3v, 5v and 1.3v(cpu core voltage) - all of them are okay.
There are 4 crystals on the board:
RTC - 32768Hz - ok, see photo.
CPU PLL - 12MHz - ok, see photo.
USB?(not sure, located near CPU) - 48MHz - nothing, just flat line at ~0.5V.
FPGA or memory?(located near those chips) - 100MHz - nothing, flat line at ~2.7V, though my DSO quad cannot measure such frequencies.
So core oscillation and power are present, but there is no data at uart...
Any other ideas?