I have a Toshiba 40H80 rear projection TV with sound but no picture. Menu will not display, nor DVD or cable TV.

SOURCE: accessing sevice menu

i tell people all the time if you get into the service menu and hit the wrong buttons i wont know what you did to it again if you post here to ask how to get into the service mode you dont have the desire to find the codes on the internet which are readily available as are service manuals turn on the tv push mute on the remote till mute goes out hold down mute button and push menu on front of tv hit menu again when the s comes up hit 7 on remote and watch out you just figured how to reconverge your tv maybe not

SOURCE: Toshiba 51H83 51 in. Rear Projection pisture issue

I have a wild guess. I have the same tv and channel 72 is the proper channel to watch tv on. I don't know why, but maybe try channel 72 instead of the usual channel 3. Good luck, maybe a quick fix, maybe not!

SOURCE: toshiba 50"rear projection hometheater picture shut off on/off light flashing

take the back off and change the fuse

SOURCE: Toshiba 42WH36P rear projection TV has wavy lines

the problem is going to be a bad NEXT HYPER UNIT module. this is the digital scan card in the tv. try using the componenet inputs and if the tv works ok then you know that the HYPER UNIT is the problem. the reapir process for a "do-it-yourselfer" is too involved and would recommend a serivce center for this repair.

SOURCE: toshiba 42h82 - "broken" picture

the "scan converter module" is located directly behind the board where your inputs are in the back of the set. That should repair the problem.