SOURCE: toshiba regza all but the hdmi input on my 42 inch toshiba regza
In most cases the HDMI issues are the source itself. Try another item like a DVD player or BluRay player. If they work then its a compatibility issue. If they don't then the HDMI receiver board in the TV is bad. Please take a moment to rate my answer. Thanks...
SOURCE: Scratches on tv screen.
I have used clear plastic sheets and silicon tire dressing for smaller problems like this, but no idea how well it would work with a large screen TV. The westleys silicon tire shine smooths out the scratches, and you place the clear plastic sheet on top of that and work out any bubbles then tape the ends. It pretty much changes a standard screen into a glossy screen with the added benefit that you can always replace the sheet if it is damaged.
I usually get my clear plastic sheets packaged with the new LCD screens I purchase for repairs and I just keep them in storage.
SOURCE: Toshiba Regza 42" HD TV - a little under 2 years old - pixelation
You may have failing T-CON board or it is not getting clean 12vdc feeding it.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
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