Our TV has approximatley eight small lines that run across the top of the television. One of the lines only runs halfway across the screen. These lines are thin, like a pen line. Anyway, what is wrong and how do I fix it?
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Re: White Lines in picture
Your problem is common for sanyo and fisher tv's the B+ feed capacitor is defective and maybe the waveshaper in the cuircuit right next to the IC. Your probably gonna need a service manual to find these caps as if you get one from sams photo facts post the vertical here and I will show you the capacitors to change. Done it a hundred times but I dont remeber the #s. Old age I guess. Good Luck
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This is a retrace blanking problem. Probably, the Vg2 voltage is too high, so the cut-off point from the picture tube is not correct. Try to lower this voltage. On most common flyback trafo's it is the lower adjusting screw (plastic kind of button) which is used to set the Vg2 voltage. Turn it a bit CCW until the white lines disappear.
We have a Samsung LE32A457, whilst we were watching T.V tonight the top halve of the screen suddenly appeared with green lines halfway down the screen and that half of the picture was unwatchable, T.V is 2 years old. We have removed all scart leads but this did not help and the problem still exists, when shutting down a white horizontal line across the centre of the screen appears from this line upwards the picture is faulty. Any help or advice would be grateful.
Are they thin, white lines running east to west? If so, they are called retrace lines and indicate that the screen settings for the picture tubes is set too high or there may be a mal-function of the CRT driver circuitry. Try adjusting the screen controls which are located behind the front grill of the TV behind an access panel. Once you remove the grill and access panel, you'll see a small control assembly the has two sets of controls. Three for adjusting the red, green, and blue focus, the other, the red, blue, and green screen controls. To adjust correctly, put the TV on an unused input(dark, blank picture) and adjust until there are no visable retrace lines or color in the image.