sony 55s8505c wont turn on

[sparky8787]

Hi, 

I have a sony 55s8505c tv. It has decided that it doesn't want to start up. You turn it on by the remote or the button on the side and the light comes at the bottom then after about 10 seconds it goes back to sleep again. 

I changed the power board for a 2nd hand one and it still does the same thing. So it's probably not the power board. Please can somebody point me to the possible fault. 

Regards, 

Marc

[rooobb]

Sorry but I do not think you may find an help on this community. Most of the members including me do not even know where to start to change a motherboard.  You should get in contact with some support center or a professional