I can hear the Wii, but not see the picture

Check on google for flash light test. If you can see image then the issue is with your inverter board.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent. Line faults to all LCD screen are similar, irrespective of its brand and screen size.

check solder joints on top of screen some screens were sub contracted to a chineese company called chi mai and had inherant defects

It seems to be a compatibility problem. Check both operation manuals and follow instructions contained there.

May be the light engine electronics...not a very cheap fix...also just a note...please indicate brand

Your cables still could be going bad, even though everything else is fine I would go to a gamestop and buy a used cable and see if that works or go buy a brand new one.

That would be my solution. The trouble is either in the box or your connecting cables. Verify this by connecting the cable directly to the set. Then try a new set of connecting cables, or call the cable provider to replace the box.

Hi bnkbaker, Sorry to hear your having TV problems. We need to check your backlight inverter, While your tv is on and you can hear audio(sound) take a flashlight or a lamp with a bare bulb and shine it on the screen, look very closely at the screen and see if you can see a video image. Let me know what you find and I can assist you further, please rate this solution. lone99star

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jason_77a19afa8d604dee

replace DM or try to fix it.
http://www.chrisandnat.com/Projects/BlinkingTV/blink.htm
http://www.jeremyburns.com/Mitsubishi-Green-Blinking-Light-Fix.pdf
http://www.fixya.com/howto/h159332-mitsubishi_dm_board_repair
http://hdtvoice.com/voice/showthread.php?t=32186

Please check the back of the Wii for loose or disconnected cords. Also check the back of the television for loose or disconnected cables. Also if you use an adapter and the Wii runs through a different source before the television such as a VCR, or DVD Player, Check those to. Hope this helped! Have a great day!