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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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.
Until I actually get my hands inside one of these sets, I can only guess that you have a shorted component keeping the power supply from operating. If it weren't for all the Tv's that the *MART stores are selling the would be a lot more TV repair shops go out of business. Generally you don't want anything electronic with that brand name associated with it. Sorry to be so glum.
I suspect you may have a short in your horizontal deflection circuit that is keeping your power supply from fully energizing. I do not have any information on this model and suspect that it is actually made by symphonic/Funai corp which puts it in the disposable Tv catageory in my opinion.
This problem sounds like a short inside the picture tube itself unless a driver transistor failed that drives the red gun in the CRT. You may have to take it to an authorized repair facility if the picture tube is still in warranty.
This is a very easy fix. Your cable box is not grounded correctly. To fix this you need a AC Plug adapter. This will change your TV ac plug from a 3 wire to a 2 wire. This may sound funny, but trust me on this. I have fix a lot of TV in NY doing just this.
You probably have a couple of resistors out as well as a shorted D396 Zener Diode that is supposed to keep the voltage regulated at 8.2 Volts DC. With it being a Sylvania brand, it is probably not worth repairing.