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red, green, and blue lines curve across the top of tv is cause by defective convergence STK IC or you have open resistor at convergence section. if you have defective RGB Color vertical ramp probably you have defective STK IC..
You red convergence IC is bad, Have the Convegence IC's replaced,It would be wise to replace them both because if the red has failed then the green/Blue IC will fail soon too. Better to replace them both now then have to do the same again with the other IC.
They are large black IC's mounted on a metal heatsink with part numbers on them the Number on them is the part number should be STK-392-040.
Replace the red AND blue convergence IC's. Both need to be changed. You change the blue IC to ensure your repair will be reliable. They are mounted to large. finned heat sinks because they get very hot..hence why they fail more often than any other part in a projection tv. The # on the chips will start with "STK-" followed by numbers. These IC's are available through tritronicsinc.com. They cost about $15 to $35 each. Good Luck!
The question is old, but this might still help someone.
I had to replace mine on the 55" model, and I went with the STK 392-150's. The cause of failure is normally overheating, and with mine they did a lousy job of applying thermal paste to the backs of the ICs. (as you can see in the pic, so I'm sure that is why they failed). Depending on where you buy them, you can probably find the 150s or 180s online for the same or lower price anyway, so go with the higher power rating since that means they will likely withstand more heat for longer. But make sure you buy a good thermal paste and apply it evenly and correctly. Mine is working great now going on 3 months, I used Tuniq TX-4 paste. BTW, I'm a lousy solderer but I removed the old and soldered-on the new chips by hand. It looked pretty rough but ended up working perfectly. Anyone can do it!
Q783 is a 2SJ512 (FET) with part number 23205037. These are not the easiest to test. If you suspect that it is bad, just replace it. It costs $2.48. I only have a listing for one convergence IC (STK-392-110), but if there are 2, replace the one labeled RVBVGV or just swap the two to see if the convergence shifts from vertical to horizontal.
I would suggest the convergence ICs as well as a couple resistors right near the Convergence ICs mst likely. 90 % of the time thats the problem. They are not expensive, if you can solder you can handle it if your careful with your solder and use heat sink compound. The ICs will have a number stamped on them usually STK XXX-XXX on a huge heat sink. The following link will have replacement parts http://electronix.com/ Hope this helps you out