Black screen, no backlight.
I have a similar problem. Vizio 70inch LED TV. Model M70-C3. Black screen, no backlight. The power button lights up and the optical audio port lights up. I removed the back panel and checked the voltages on the Power Supply board.connector to Main Board, standby voltages for AC det =3.96, PS on =5.13 and AU =12.. Pins 8&9 VS =12v. Pins 13&14 T-con =12v, however pin 15 T-con on =0v. Also T-con connector pins 1,2,3,4 measured 0v instead 12v. Checked output voltages on LED Driver connector. Pins 3-8 measured 34v instead of 24v..Pin 13, vsense =2.6v. To summarize, zero voltage output to T-con board and higher voltage 34v instead of 24v going to LED driver board. Can you advise me on which board I should replace. My initial thought was the Power Supply board, however I guess it could be the Main Logic board not setting T-con on. Another possibility is the LED Driver board.
I need some guidance
Update (08/23/23)
OK, did all of that and measured 0 voltages on both ribbon cables at T-con board. Is it a faulty Main board ?
좋은 질문 입니까?