I had to get RF modulators for my sanyo's even though i have cable. when i had sat i had to do the same thing...but mine are all older sanyo's. i've had them since i was in college (when the created the wheel)
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Is this or does this happen to all channels. First check the connection on the back of you TV is it tight and secure. Second You may also need a new decoder from warner cable to view. (Channels are scrambled) and third look for TV repairman.
Usually the result of a weak or interruption of the signal. If it occurs on all channels, look into getting an inline amplifier. If you have several splitters going to different tv's or a multiple splitter, the signal is degraded each time the signal is split. You can test this be temporarily making a direct link to the TV from the cable source. If it clears up, then you know you need to amplify the signal.
The cable companies take the signals for your basic channels and resend them through the cable as analog so the customers that still plug the cable direct to their TV can still get some programming without the added costs of digital cable boxes on every TV.
This option will be slowly phased out over time but for now it is available.
I assume you have cable. The cable HD and digital channels are usually sent in Quadrature Amplitude Modulation (QAM). The cable companies are required to send local channels in the clear but not so for any others. Regular (basic) channels may be clear or scrambled. USA many not be but HBO will be.
So you have 1 of 2 problems: (1) your TV does not do QAM or (2) they have scrambled the channels you want to see. Questions: (1) Have tried direct Over-the-Air (OTA, ATSC) reception for your locals? (2) Can you see the HD local channels on cable? (3) Are you paying for an HD box from the cable company to have the channels decoded? If in doubt contact the cable company.
Current Samsung TVs do do QAM and OTA HD. Alternatives are Dish or Direct to get satellite with an HD receiver using HDMI or 5-cable RCA. Costs are comparable but OTA wins, hands down.
In many cases by connecting the DVD via a scart cable (depending in what country you live in if your system supports it)
the dvd will send a signal to the TV to switch over to RGB mode when you start playing the dvd. Rember to make sure the scart connectors are firmly pressed into their sockets on both tv and dvd.
Also if you found out how to switch channels directly on the TV try to go through them ...you might find the AV channel that will show the picture from your dvd.
Get an antenna hooked up, even rabbit ears should pull in a few analog channels. Set top boxes will only output Ch 3 (switcheable to ch 4 on the back if needed) and cable may be dead or only give you scrambled CATV channels. You need to set your tuner to "antenna", not CATV, IRC,HRC, or ATSC (if you have a digital tuner) and do the setup again. You could have a bad tuner at worst, and all is not lost, just hook up a VCR via RCA cables and use the VCR tuner to change channels. Keep TV on Ch3.
I uncovered the problem. The "analog tuner" seems to have gone bad. The part is $25 -$36. The set can still be used however. I just removed the coaxial cable from ANT 1 in the back of the TV (this is what I believe has become defective)which was going to a VCR. I then just used composite cables(red,white,yellow)to bring the signal directly to the TV from the cable box, rather than the VCR. All works however, will replace the defective part.
If you have a good cable signal connected to the TV and it receives channel 50 nice and clear but all lower channels have nothing but snow, then the tuner is defective and needs to be replaced. This is quite an easy thing to correct. Sometimes resoldering all connections inside the tuner will bring it back to life, but in either case the set should be serviced by a qualified tech.
Checks sould be made in AGC circuit.and the related crcuits like the virtical ciruit and the horizontal circuit.the picture iis syncronizing.have a tech look at it to see if the operating voltage are correct and replace components.good luck