Question about Zenith B25A76R 25" TV

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Diagonal lines across picture

We were gone for six months and when we returned our Zenith TV picture had diagonal lines across the screen and after it is on for a while a steady tone came on that could not be turned down with the volume control.

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Re: diagonal lines across picture

Do you have a dvd or vcr hooked up to this? Is it hooked up with the a/v cables (yellow, red and white). double check the cable hookup make sure audio cord is not in the video jack, from what you are saying this will do that if it is. Also there is a capacitor on the main board believe it to be C3412 which intermittenly gives horz. lines but haven't had a audio tone with that.

Posted on Nov 30, 2007

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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!

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Its a zenith 27in the sound is good but the picture only shows a line across the screen

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Fine interference lines running diagonally across picture.

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2. a bad fuse feeding the convergence circut
3. a bad relay feeding the convergence circut

whatever the one it is they all have the same result, an inoperative convergence curcut. needs service .

if it is still under warranty, great. If not the parts can cost up to $300 and labor can be the same

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