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You can try a hard reset: Unplug TV from AC mains and remove all cables from TV. Wait about 30 minutes and replug to AC power and redo the cabling. Switch on the TV and see if it works..
Certainly, I can help you. I would recommend going to the following link and getting the service manual so you can see first hand disassemble instructions and testing procedures. Its only 10.99 and they email it to you shortly after purchase. The manual is a valuable resource as it will have part numbers in case you do need a new screen. here is the link. http://servicemanuals.vstore.ca/
are you looking for this part? http://www.partstore.com/Part/Thomson/RCA/264658/New.aspx?ModelMfgName=Thomson&ModelBrandName=RCA&ModelNumber=D52W17BYX1 if so, just make sure your model number is on the listed devices.
RCA have choices for different methods of CC in user CC menu. Labelled T1, T2, etc. . Different selections are for different types of close caption. Tune to a signal (on your other TV) that has closed caption working.
Tune your RCA to the same signal. Change the T1,T2, etc settings until the closed caption for your signal appears.
If this doesn't work, try connecting analog video or VHF channel 3 (or other specified channel) to the TV. check CC. When TV stations, sat channels, sat receivers, cable boxes etc, convert analog video signals to HD, problems can result. Some equipment causes RCA TVs to do unexpected things with sound and closed caption.
If you use RF or video output, old analog video may look better on CH3 or video than on HD input and the CC will work more consistently. Watch HD signals on HD input, Analog signals on Video in or through the TV tuner . Many HD channels and programs are converted analog video and look poor on TV HD inputs.
More information is required to properly troubleshoot this problem. How is your television connected when you are watching HD? Do you have HDMI for this, do you have a satellite or digital cable box? For analogue are you using regular coax antenna (cable TV), or are you going through a cable or satellite box?
This could be related to the aspect ration setting. perhaps you ahve changed your aspect ratio from 16:9 to 4:3 or some other setting. If you are connected via HDMI, then the digital signal may be "normalizing" your picture during HD, but reverting back to the other setting.
Check you video settings very carefully. HD televisions are very difficult to tweak properly.
Try an antenna if you want to get analog over the air. I have a feeling that with the way the standards are changing, you will only be able to get digital channels. After February, the analog channels won't be around.
If you are using cable tv you need an HDTV box to get high def.
somewhere in the tv's menu there will be something called autotune or channel settings. while in that part of the menu you should find something to change settings. also there are many inputs on the back of big screen tv's, you might try a different input like cable/antenna for instance. it may take a two way splitter to split the signal for both digital cable and analog cable. by next february the analog part of the cable may not work anyway.
Most newer Digital TV's don't display Analog signal very well. Often worse then an Analog TV. This is normal to a degree. If your Wii has component cables, try using that. As for cable, you might get a better signal with Digital Cable.