Have you tried shining a bright light on the screen while it is playing to see if the picture is faintly visible? Could be a blown backlight due to the faulty board you replaced.
SOURCE: I have a Samsung LCD TV Model LN-S4692D. I lost
You might want to try reseating all of the ribbon connectors that connect to the tcon first, but it sounds like you may have a bad panel(screen) which is probably what made the original tcon die. The only other possibilty would be the backlight inverter board(either the master or slave depending on which side the dark area is on).
SOURCE: i have a vizio vp422hdtv10a i have sound but no
Hi!! I got problems with my Vizio 42". Have sound but no video. I replace the video logic main board and fixed the problem but a few days later the same problem came back. Before this I also replaced the backboards. Any help from someone?
SOURCE: vizio m420nv has sound but no picture
Hello there
Actually that problem is very common on all LCD TV,, that problem is cause of either inverter board or t-con..
In this case you don't need to check the voltage that is too complicated for you,,only visual check is enough..
I share you my tricks and hope it helps..
Power on your TV turn off your lights..if you will see the light comes from the screen the problem is t-con..if no light the problem is inverter board (backlight) board
Hope it helps..
Don't forget to rate..
SOURCE: bad T-con board on my vizio tv
You can easially do it yourself only takes a couple of minutes to replace the TCON you can get replacement TCONs from www.tvrepairworld.com
SOURCE: Vizio e701i-a3 problem. When I turn it on the
Very good chance it could have bad diodes. You will have to take the back off your TV and check to see if any have bad soder or need to be replaced
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