I have an Element Electronics 32 HD Digital LED TV and does not auto scan

Main system control memory IC fault. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

put the co axel cable in the back , bypass this tv programming stuff put your tv on channel 3 or 4 and use the cable remote , no tv channels just cable

Your TV must receive a digital signal in order for the DTV option to be available. Since you are not seeing all of the channels when you auto scan then it can be assumed that the signal cable connected to your set is not providing the digital signal. Make sure you are scanning for the proper source of your signal ( Cable TV, Broadcast TV)

Main system control memory IC fault. Contact any service technician to replace it. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Check it by making a hard reset. Unplug the TV from AC mains wall socket, and re-plug it back after 10 minutes or so. This must make it a hard reset. If this do not help you, check and replace it system control memory IC. It is faulty. If you are not familiar with electronics, do not attempt to repair. Whether you suffer fatal electrical shock! Instead, contact the nearest service center.

Hello
To tune your Panasonic Plasma to on air TV channels do the following:

Connect the antenna connection to its antenna in at the back panel.

Automatically searches and adds available channels to the memory.

Select "ANT in"

Select Cable or Antenna Select "Auto"
Select a scanning mode

Auto channel setup
Select "Auto program"
Select "ANT in"
Select "Auto"
Select scanning mode (ALL channels/Analog only/Digital only

Start scanning the channels

Available channels (analog/digital) are automatically set.

All channels: Scans digital and analog channels

Analog only: Scans Analog channels only
Digital only: Scans Digital channels only
Confirm registered channels

If OK is not pressed after selecting "Apply", the channels will not be saved.

The channel will be saved when no operation is performed for 60 seconds and

the "Manual program" menu will also exit automatically.
If you perform scanning more than twice, previously saved channels are erased.

About broadcasting systems

Analog (NTSC): Conventional broadcasting

Digital (ATSC): New programming that allows you to view more channels
featuring high-quality video and sound
[Use "UP ' DOWN ' RIGHT ' LEFT] AND 'OK"] keys to selcet and proceed.

In the main settings, there should be an option for AIR or CATV, air is for non-cable and CATV is for cable tv. This has to be on the correct setting before you autoscan

I have run into the same problem with a different model (32 inch from Circuit City). You may have found that there is almost no support from the co or web. I do not have an official solution but have some work arounds that have done the job for me.
WA#1 = after a channel scan tune to a HD/digital channel before you turn the set off. You need to do this each time for several times, because the set when turned on to a regular cable or analog station will default to skip all channels. After several times the set should remember your channels.
WA#2 = after a channel scan, go to the skip channel section of the menu, and if your remote has the colored buttons on the bottom scroll through the channels using the red and green (up and down on this menu) buttons. This apparently helps the set remember not to skip your scanned channels.
These are not glamorous solutions but appear to trick the TV into not re-setting the skip function for the channels.
Best of luck.

I have experienced exactly the same issue on two Westinghouse sets. Try turning the set off when it reaches 83%. When I turn mine off and back on, it has saved the channels -- at least the ones it had found before it got hung up.