I had the same problem on my DU-42px12xc. Red, green , and blue lines
vertically on the right side of the screen. I found a loose solder connection under the inputs board on a resistor. After re-soldering, everything was crystal. I'm happy I grabbed this tv before my work threw it out. Be very
careful when soldering
SMT components. Use proper equipment. I had to troubleshoot while the tv was on, so I was extremely
careful not to short anything out.
I pulled the inputs board out to gain access to the "Y-axis" pins.
resistor located under the inputs
I started pushing on the resistors 'till the color lines started working correctly, and re-soldered the four resistors.
Is the cable or sat box connected using an HDMI cable, regular cable, or Red/Green/Blue cable? Do the lines appear when you press the "Menu" button on the Television (not the cable or sat) remote? Do the yellow lines appear on another source - on a dvd player, for instance?
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