Won't receive channels above 18, cable not at fault
TV gets only "snow" above channel 18 or so, other tvs in house work fine (cable), have lost original remote and cannot call up menu or settings on "universal" remote to try and reset channels. No obvious buttons on TV. Is it fixable or should we shop for new TV?
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Sounds like your TV has lost the DVD channel. Turn off TV and make sure the DVD player is connected to TV and is playing a DVD. Now put you TV on and press the SOURCE or AV button on your TV remote until you can see the DVD channel. In older TVs you may need select channel and tune it manually using the TV setup.
Check the aerial cable, ensure it is well plugged in and getting signal.
If you are using a receiver box, check cables to TV and receiver (freeview, sat, cable etc.), try setting channels on receiver again, if it does not work but you get static, then either the cables or receiver are defective.
Test the TV on standalone , connecting it to an external antenna. Tune again the channels, and save the preset. If still no signal then the antenna socket on the TV may be defective.
Try using the TV with a DVD.
If you can watch DVDs, and TV is not keeping channels preset, and you tried all the above, at this point htere may be a fault in the tuner card inside tv.
Call the phone number listed on tv user manual to get support, and eventually repair it.
In most cases when you set your menu ("tuner section") to cable, the tv will pick up all channels, but if you set it to "off air" or "antenna" (or whatever the other choice is labeled), then the tv will only go up to about channel 50 or 60. Are you using cable, dish, or an antenna on top of your house. If using cable or dish, then go into the menu on your tv and set the tuner to "cable". I am pretty certain that your tuner is NOT currently set on "cable" and that also there are no local "off air" channels in your area on 2 thru 6, therefore, you see snow on these channels. I have repaired hundreds of tv's and I feel very strongly that your problem is in your menu.
Most tv's have an Antenna mode and a cable mode. If you have cable tv service, the cable mode must be selected in order to receive channels higher than 23. Then you must auto program the channels thru the menu screen on the tv to receive the channels above 23. If you have a house antenna or rabbit ears, its hit or miss on receiving all VHF and UHV channels.
It is possible that your Toshiba is set to receive aerial TV programs and not Cable TV programs.
You need to go to the set-up menu (via remote) and go to the air/cable selection. Choose cable and then auto search/scan. This is a generic procedure and should work with your particular brand/model but the terms/names may just be a bit different. You may also consult the users manual for the exact procedure.
Hope this give you an idea. Good luck and kind regards.