You need to perform the flashlight test. Turn off the lights in the room, turn the TV on, take a bright flashlight and shine it on the screen. Do you see the faint image on the screen?? You could have a defective backlight inverter, defective power supply, or a main board issue. You set will require diagnosis to determine.
SOURCE: Vizio GV42L LCD TV screen black when turn TV on first time
If you are using a set top box this might be caused by turnig the box on at the same tie as you turn the tv on or slightly after you turn the tv on. If you are using compnent or HDMI inputs the set needs to see the signal as it is turned on to know what formt the signal is in.
I’m happy to help further over the phone at https://www.6ya.com/expert/dewayne_4a10eab6caecdb92
SOURCE: 2004 Toshiba 37' LCD HDTV-No video only audio?
This problem is caused by at lease one of three conditions;
1) The inverter board(s) is bad.
2) The power supply for the inverter board is bad.
3) You have bad CCFT(s) (Cold Cathode Florescent Light)
SOURCE: Vizio screen went off but power light is still on
may be a mainboard problem. If you can see the orange light it usualy means that there is power running through the TV... usually inverter boards are a problem when you do not see any backlight at all.
SOURCE: VIZIO LCD VX20L, intermittant video/audio with Blue screen message "No Signal"
If the tuner is bad, changing the mainboard should fix the problem.
SOURCE: Black screen but have audio.
It's a pretty common problem. (If this is a plasma your post says lcd but it came up under plasma.) The no picture but sound problem is usually the y sus board. I've replaced 2 on mine now. The 680uf 35V capacitors usually are bulging because one of the power transistors went and took them out. This has happened to both of the y boards I had. One time the failing y board took out the buffer boards too, and once it did not. The fix is super simple and anyone with even the most rudimentary knowledge of computers or electronics can do the labor yourself. You should do the simple stuff first by just doing a quick test with a multimeter. Just check the power coming to the y board. After that you can just remove the y board by removing 3 cables and like 3 screws. Plug in the new board and it's done! You can source the parts from a place like shopjimmy or discount merchant. 3 boards were like 200 bucks. 1 board is like 100 bucks. Labor took me 15min. Think about that the next time an electronics repair place charges you 1000 dollars. Of course they check everything (Yeah right) and warranty their work (I don't) but if you check the service manual it states that this is the most common repair. Look for the Canadian manual online. Hope this helps!
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