Sony KDL-52W4500 - not starting, 3.3v is ok

[serg604]

Hello

i have Sony KDL-52W4500 and it is not starting at all, not leds, no relay clicking, at CN6150 connector only STBY3.3V (pin 3) and AC_OFF_DET (pin 2) are present (3.3v both), thats all. PS is 1-876-290-13 (G5 board), all mosfets, diodes, 000 smd seems to be ok. What voltages must present at main board, so it will give out that POWER_ON signal? because right now there is only 3.3v and nothing else, also when i press power on button at remote or tv there is still 0 at POWER_ON pin (1), and i'm not sure what can be problem, PS or main board...
Please give me some ideas if you know anything about this model (W4500), smaller ones have almost same main board, so i dont think there will be many differents. Thanks