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If you are seeing snow on your Symphonic TV screen, it could indicate that the TV is not receiving a signal from your cable or antenna. Here are some steps you can take to troubleshoot the issue:
Check the cable or antenna connection: Ensure that the coaxial cable or antenna is securely connected to the TV and the wall or source.
Run a channel scan: Perform a channel scan or auto-programming to ensure that the TV is tuned to the correct channels and that it is receiving a signal.
Check the TV's settings: Make sure that the TV's input is set to the correct source, such as cable or antenna. Also, ensure that the TV's settings are not set to "mute" or "no sound."
Try a different device: If you have another device, such as a DVD player or gaming console, try connecting it to the TV to see if it is able to display video and sound.
If none of these steps work, you may need to contact a professional technician or the manufacturer for further assistance.
If you are using an indoor Antenna: 1- the most probable reason would be the location of the antenna and TV in an area where the reception is very low. Indoors all houses are affected by the running electrical circuits which in turn generate magnetic field that together with the structure of the house obstruct or weaken the wave signals of wireless and TV reception. Also this issue may be aggravated by the vicinity you are live in. Where you are living may not have the optimum reception from some services including TV signals. Your best bet is to try moving the (Indoor) antenna closer to the outside (such as windows, or better to a balcony) and try all four directions of the house. 2- One other possibility, is the antenna jack being disconnected from one of its wires (or a de-solder) at an internal part of its circuit). This problem can be detected by trying another antenna that is working good when used with another TV (and preferably at a different location) thus testing for the possible weak signal at the same time. 3- The last possible issue is the antenna receptacle built onto the Tv set. This may have a problem of some element of it disconnected internally on the board or de-soldered.. If the Antenna is external, all the above points are still valid, but the probability is higher, for some hidden disconnection on the receptacle, the antenna plug or at the connection of the co-axial cable with the external antenna. (Once I found a co-axial cable with disconnections of its central copper wire within the protective insulating coat- probably due to defects in the plastic coat that had microscopic holes that allowed air and humidity into the central wire and caused it to corrode and have those discontinuities)..
Here is the manual:
http://www.symphonic.us/pdf/om/SC313D.pdf
Follow the instructions for connecting a cable box to connect your converter box. Front panel buttons can be used to make menu selections if you do not have a remote.
You can get a 75 Ohm to 300 Ohm balun from a local Radio Shack Store and connect it to VHF antenna but you won't be able to receive off the air signals for very long because in about a month all TV signals will be being broadcast in Digital Format nationwide and all you will receive is SNOW. You'll need to also buy a Digital to Analog conversion unit as well to receive off the air programming. Sorry for the bad news but that's the advancement of technology and mandates from our government (FCC).
Pretty much a hoax on those diverter boxes. People ran out and bought them thinking that won't have reception. I have many years in maintenance and several years in nursing homes with different tv's in every room. Not once have I needed a box to pick up channels with or without cable. I myself get 16 channels with rabbit ears and thats enough for me. And I do own a combo as well and it has simple antenna and does me just fine. Depending on your location, the old tv antennas we use to put on our houses...they work amazing! Might be able to snag one on a freecycle or craigslist site. Good luck! :)
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