Samsung SL620 - - "Card Locked" message

It could be either the camera or the memory card. Try a different memory card. If the different card works, then likely your card is bad.

SD cards have a slide switch along one edge. The position farthest from the metal contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card.

if it is ok for take a picture? if lcd screen is red and picture is not clear, probably it is the problem of camera sensor. You need change it.

Try a different card (you can buy one and return it if that doesn't fix the issue).
Maybe your card is full.
Maybe your card is installed incorrectly.

Look at the memory card itself. SD cards have a slide switch along one edge. The position farthest from the contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card. If the switch is already in the proper position, slide it fully the other way and then back again.

Try a new battery/charger. You should be able to get these under warranty if your camera is less than a year old.

No, but you'll find the Easy Manual and User Manual listed at the bottom of this page on the manufacturer's web site:
http://www.samsung.com/us/support/supportDownloadCenter.do?prd_ia_cd=N0000112&prd_mdl_cd=EC-SL620ABP%2FUS&prd_mdl_name=SAMSUNG+SL620

Probably because the tv doesn't have the correct circuitry to play videos. If you have a VHS recorder connected to the tv, you could download the video to a tape and play it that way. I have a Dish Network HD DVR. It has a usb connector allowing me to download to the DVR and play slide shows and videos.

Move the slide switch on the side of the card.

Remove the battery, wait for 20 seconds and replace it.
Check that you are not in Replay mode.
Now switch on and see if the system has reset.
If it will not reset, go back to the dealer.