Take a look at [http://tampatec.blogspot.de/2015/03/sony-bravia-kdl-lcd-tv-error-codes-for.html|this].
4 red blinks- can be LD board or main logic board, check inverter board wires for arcing to ground
6 red flashes- backlight issue, bad main board, or power board or inverter boards- check standby volts on power board. "backlight on" volts should be 3-5v from main logic board then 24v to inverter