I've had a good picture for 3 years and suddenly when I turn on the tv for the first time in the morning, there will be diagonal lines moving from bottom to top in varying width (from 1/8 " to 1/2"). The picture is not distorted while this is going on. The first few days, it cleared up after about 15 minutes. Today, it took almost 25 minutes to clear up. And right now, after being on for several hours, the lines are constant. Will this be expensive to fix.
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Without seeing the lines I can't be sure what your set has wrong, but here are a some possibilities:
If the lines are lines are confined to the top inch or two of the screen and the picture looks otherwise normal, the trouble is bad capacitors in the vertical output circuit. Fixable by replacing the bad parts.
If diagonal lines are across the entire face of the picture tube and the picture looks washed out, the trouble is often a bad capacitor on the 200-volt line to the picture tube. This may be on the main circuit board near the horizontal output transformer, or on the small circuit board plugged onto the end of the picture tube. Again, replacing the bad capacitor can fix this.
If your TV is actually an RCA, someone may have bumped a rear-panel adjustment. On the back of the TV near the bottom right are two small knobs. RCA left these adjustments exposed inside of putting them inside the set like other manufacturers. These sometimes get bumped if someone was behind the set cleaning, or if a pet got back there and hit them with a tail. The top knob adjusts focus, and the bottom knob adjusts something called G2 or screen voltage. If this gets turned up too high it can cause the faded picture and diagonal white lines. Turn the adjustment down until a black screen looks black instead of gray.
A bad picture tube or horizontal output transformer can also cause lines through the picture. If this is the case with your set, it's time for a new TV. The transformer is relatively inexpensive but labor costs aren't, and the repair bill may exceed $200. If the tube is bad, there's no point even considering repair. The tube cost alone exceeds the cost of new TV.
Hopefully your lines are easy and cheap to fix. Good luck, and thanks for using Fixya!
It sounds like the dmd board may be defective but you can try rebooting the set and see if it makes the picture any better...
1 - Turn on the Tv. 2 - Press & Hold the up arrow key on the remote and then press the power button on the front of the Tv. 3 - Tv will reset & reboot
If the picture is the same it's probably the dmd board which is part of the "B" block assembly and I don't believe they're sold separately. The "B" block is about $1100.00 dollars.
Hope this helps!
These are called retrace lines they occur because of the blanking pulse not turning off the electron guns in the picture tube during the retrace period. Since this is occuring with the red gun there may be a proble with the video circuitry connected to the red electron gun of the picture tube. This would include the red amp and the red driver transistors. You will need a schematic and a multimeter to properly test these items.