While the TV warms up there are wavy lines that run across the screen like waves in water. Once it warms for a while the lines become stationary. Eventually they are fine enough that they do not interfere with the picture much.
Sounds like the convergence has failed. This video gives more details
SOURCE: Mitsubishi VS-60707 60 in. Rear Projection Television
When it gets better after warm up it can be a capacitor in the 160 Volt high voltage circuit or a cold solder joint. these 2 thinks would be my best guess on this set.
SOURCE: Mitsubishi TV had horizontal lines across the screen and rolls up
Answer
ONE: Yes, the speaker mounted close/near to the set
can be a cause of mischief; please move it further away and see if that
helps clear up the problem. But, you must keep it away for several
days before you will know for sure because it takes some time to
degauss all the internal parts that may have become corrupted by the
magnets in the speaker.
TWO: Yes, any set can be repaired the question is cost and wisdom.
Old sets are sometimes not worthy of the repair simply because of the
likelyhood that another failure will follow soon after. A big screen
always invokes a repair charge of $200 and up. After a few of these you
will wish you had put all the money into a new set!
THREE: The lines are most likely a problem in the vertical blanking
circuits of the set. These are horizontal retrace lines that are
supposed to be blanked out during vertical retrace of the raster.
Think of it as a paintbrush that scans across the screen painting thin
lines and when you get to the bottom of the screen it goes quickly back
to the top, but during that time the horizontal, which is many times
faster, has made several sweeps; so it must be blanked out during the
retrace. The repair involves finding the guilty parts and replacing
them. Usually this repair runs over the $200 somewhat.
FOUR: Prior to calling in a service tech try a hard reset to see if
that will recover any of the circuit degradations. Merely unplug the
power cord and leave unplugged for 4 hours or more. It may help. Or,
it may not help; but worth a try since is won't cost you anything.
If the set is over 5 or 6 years of age it probably is not a condidate
for any expensive repair. On the other hand, it is a Toshiba - and
they make a fine set.
Hope this helps. Let me know if you have further thoughts.
SOURCE: Mitsubishi Big Screen TV has horizontal lines on start up
need replaice capacitors in vertical output cir.
SOURCE: Wavy horizontal lines running through the screen
Ur tv convergence is dead.U must know how to solders?The 2 STK convergence ICS.and some or all it resistors must change.Tries websites Tv repair World.com,Tvrepairkits.com to repair it ur self.The shop will cost u $300 for parts and labors.
SOURCE: Mitsubishi rearTV has intermittent wavy lines running throughout
Do you have anything to test it in 1080i? Does it do it on all connections or just one? I had a similar problem with my TV that turned out to be a bad input board. Mine would only display 1080i through the Component connections. All others would show pink and green wavy lines. It cost me around 500 to fix it. Unplug the TV. Remove the back cover for the TV. Using a NON-metal object, or gloves, wiggle the input board (that has all the video connections on it) slowly back and forth and see if the problem comes and goes. You will have to have someone watching for you. If something is loose on that board, the problem should show itself. Narrowing down the problem will probably save you money on repair bills.
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