Yes it's dead. I want to measure the PSU but first i want to ask you first. Is there any service manual to attach me, because i want to known where i will measure. if you are sure about this problem show me only the PSU circuit with some voltages so i can know what i'm doing. C669 is a capacitor or something else? Don't laugh, i don't known very well about the numbers of some special tv components. As i remember this tv had another problem at the past and fixed by a technician, but after a month the tv was dead. The power led is off when i turn on the tv.
Thanks for helping me.