The RGB port is not seeing signal from your PC Video card, is that what you are trying to do, using your TV as a PC monitor? Otherwise just select to other Video sources or TV mode.
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
Tries unplug the tv and any cables boxes to together,replug them both back about an hour later.Let any cables boxes upgrade it softwares.Go in the tv menu goto SETUP,go down to CH. enter pick CABLE and scan all the chanels,should get the picture and all chanels back.
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