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What is your TV source? The Polaroid LCD-2000 only has a NTSC (analog) tuner. Most OTA stations switched to ATSC signals a few years ago and a converter box is required to watch the TV. (A few low power TV stations still broadcast in NTSC but you need to be fairly close to the transmitter to receive the channel.) If you have cable, check if they have migrated to digital cable (QAM for unencrypted channels). If that is the case, you'll need a cable box.
With a digital-to-analog OTA converter box, you can still lose station reception due to the signal strength cliff. Depending on your area, you may need an external antenna or to check the direction of the antenna. I know I have to rotate the outdoor antenna every so often. It shifts in high wind. Even if the antenna only moves 5 degrees, we will lose the signal for half of the stations.
Check to see if your audio source is set to SAP. This stands for secondary audio program. For example, some stations broadcast english and spanish. Some stations broadcast english and nothing. If you are on a channel that broadcasts english and nothing, and you are SAP setting, you will hear nothing.
Do any other OTA channels break up on this TV? Look through your setup options menu for a TV reset (memory or restore default or a similar command) . Do the reset and exit the menus (save the action on most TVs); then return and rescan the OTA channels.
On a different brand of TV this worked. The channel had broken up for several weeks; the reset was used when the channel finally became totally corrupted (no video on one sub-channel, no audio on the other).
Some tuners need a stronger signal to be stable; you may need an amplifier on your antenna.
This tv is analog, EDTV is only enhanced definition tv ,480p resolution, not the HDTV 1080i or 1080p resolution, the mts/sap tuner has to do with the audio decoder. For example: SAP would allow you to view a station broadcast in english to be heard in spanish. MTS is surround sound broadcast. Thanks
You most likely have the SAP mode activated. Look for a button on your remote or an item in the on-screen menus of your television called MTS or SAP. You want to set this to "Main" "Normal" or "Stereo" (or even "Mono") mode to hear the regular television sound.
If it is in SAP (Secondary Audio Program) mode, as I believe yours is, you may hear no sound or a different audio program. Often this is a translation to another language, such as Spanish, and other times (notably with PBS stations) it is an unrelated audio (often music) feed. On some stations there may be no sound at all with the audio mode set to SAP.
Slide top button on remote to tv. Press and hold mute and select button until the green light on the remote blinks twice. Then press 991. Then press 1. Then press the tv power button once. If the tv doesn't respond hit the channel up button on the remote. If that works press select to store the code and slide the switch back to the left. If it doesn't work keep hitting channel up until it does. It can take up to 30 minutes but it works.