I have a 9 year old mitsubishi projection tv

Video board malfunctioning....Get a honest TV tech. Only three years old? It is worth repairing, will deliver several more years of excellent service. A quality television.

The best way to determine what is at fault is to disconnect the Denon tuner and run the signal straight to the TV. If the problem goes away, the Denon is at fault.

the DM and/or the FMT board are going bad. the chassis needs to be rebuilt. check out www.tv-techs.com

i have same problem, i have 55 projection tv mitsubishi, i get those white lines. how can i fix the problem.?

thank you.

Don't feel bad about Mits. All the projection companies and all the new TVs have markedly poorer reliability than the good old CRT types. You should see all the class action lawsuits against even some of the best companies!

The power supply section is not working.
Common possibilities are:
- Convergences amps have failed overloading the supply
- High-voltage section (flyback transformer) has failed
(happens sooner or later, about 8 years typical))
- CRT tube has failed overloading the supply
- Power surge has popped the power input circuit.
(Fuse, rectifier diodes, turn-on relay etc)
- One of a hundred of electrolytic capacitors has failed short overloading the supply. They dry out with age, are cheap to replace, but hard to find which one it is.
- Or any of many other possibilities.

In short, you need a experianced tech to troubleshoot this.

convergence amp ic going bad.
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Don't know the model # but you can check c2p08 100 uf @16v off pin 3 of IC2p03. This is usually the problem with these sets. For more info ctechnicians.com

picture decides to go out , sometimes for 2 or 3 days then turns back on its own.....what could this be?

do they clear up if you were to walk up to the tv and hit it?

Convergence problems are what you have possibly a pincushion error. Either way if you have to have a repair shop do the repair, you should look at replacing the old TV.