Question about Gateway LCD30TV Television

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Diagonal lines moving from bottom to top

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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  • Tvwatcher Jan 08, 2008

    This is a sample of the lines:



  • Anonymous Mar 17, 2008

    I have exactly the same prob, clears up about 5 mins after switch off.

  • Anonymous Mar 13, 2014

    picture has sludge like effect moving from left to right when it is first turned on. looks okay after about 15 minutes.

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1 Answer

Sample of a line diagnally from bottom to top of page.

Posted on Jan 07, 2008

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Posted on Jan 02, 2017

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1 Answer

White lines across tv screen


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!

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1 Answer

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1 Answer

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The case you encounter with your unit is just a minor one. Most often caused by loose contacts particularly in the horizontal circuitry. Try to have the circuit be resoldered.

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