Question about Sylvania 6427FF TV

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Sylvania 6427FF TV displays wavy verticle lines at top of the screen.

I am having a problem with my Tv. It seems to display wavy verticle lines at the top of the screen. I have no idea what is causing this.When i access the service mode and If i make a change to the horizontal freq. The problem is reduced significantly but it seems to come and go every few seconds. I checked the board for loose connections and I found only 1 and after repairing this it still seems to show wavy lines at the top of the screen . I need some help! thanks.

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Re: Sylvania 6427FF TV displays wavy verticle lines at...

I would suspect defective filter capacitors in the sweep circuits as well as the power supply source voltages.

Posted on Apr 13, 2008

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It sounds that the main power supply section to your TV has the fault. The horizontal thik lines that appears crawling down across the screen should be of video 'HUM'. Have you replaced the main filter capacitor at the power supply section? If not, replace it along with the main rectifier. The AC power is rectifed by a bridge and applied ot this main filter capcitor. It will have a capacitance value between 120 to 350MFD 450VDC. Check this section. Measure the rectifed DC voltage acorss this main filter capacitor. It should be around 350VDC, if your home power supply line is 220VAC. If it is 110AC, this DC voltage will be around 165VDC; and it should be. If rectified DC voltage found lower than the input AC voltage, replace the rectifier bridge. In some sets, this bridge section have four diodes. Some other circuits, a bridge rectifier stalk may be used.

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