Working on a TV can be difficult and dangerous due to the high voltage circuits inside. Always remember to unplug any TV before trying to service it and if unsure of the proper procedures, seek the service of a trained professional.
I'm sorry to hear that your combo television will not play DVDs and I would like to assist you. I suggest trying a
DVD lens cleaner
to see if the issue is with a dirty lens. If dust and debris has accumulated on the lens that focuses the laser, the DVD player will not be able to read a disk and give the error message. If this does not solve the issue, the DVD mechanism may need to be replaced and you will want to contact a professional television repair service or follow this link:
Sears Home Services
, to arrange a repair with a Sears Television Technician.
Please let me know if you would like any further assistance.