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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.
Try turning off the tv and unplugging it for one minute, if that doesnt resolve the issue, look into gettnig a converter box, or a signal booster to help. The tuner's in those SB model sharp televisions are not worth a penny and they need a very strong signal to be able to interpret all of your stations without problems. good luck 2 u
The power supply is starting to fail on your LCD. The noise you hear is because the circuit is trying to provide the proper power to the rest of the circuitry and is forcing itself.
The noise does increase if you tune to an HD channel because of more demand for power for a brighter picture.
Let me know if you need further assistance.
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.