If the channel information changes when you change the channel number on the front of your cable box, it may be a cable problem, and they may have already corrected it.
if the cable box is connected to the round connector with threads on it the TV needs to be channel 3. then you can change channels with the cable box.
If the cable is not connected with that connector, (the one with the threads), you need to change the input of the TV to which ever method was used.
If all else fails, I think the TV will determine which hookup you have if you auto program.
SOURCE: Westinghouse LVM-37w1
I have had this problem since about superbowl time. If I powered the set off, waited 15-20 seconds, and then powered on, it would work again for a while. Repeating this drill a number of times would lead to stable operation. We resorted to a course of turning on some XM music from DirecTV when we weren't watching. I tried a technician knowledgeable on this set, and it would have cost $500-800 to repair the set. We learned from different forums that the likely culprit was either the power supply board or the LCD controller. We also picked up the rumor that Westinghouse had quit making replacement part. It would seem that the management of this organization has a death wish. TO THE CHASE: shopjimmy.com is now selling parts from canibalized sets. They have a non-DOA warranty and a good return policy. A power supply from "Jimmy" solved my problem. I have one important hint: To remove the back, take out the obvious screws and the base. Then remove the ~5/8" rods that protrude from the bottom. There is a screw up inside each rod.
SOURCE: Picture, No Sound from HDTV Box
CON-YOU'VE DIAGNOSED YOUR OWN REPAIR.GET A NEW CABLE BOX.JOE TV
SOURCE: No picture, sound ok
I have a similar issue. Sometimes the entire screen goes black and sometimes only one-half - either the top or bottom half goes black. The only solution we have found is to gently tap the TV (usually the front side) and the picture will come back for awhile. It almost seems heat related as it only goes out after the first 10 minutes of use. There must be a fix to this.
SOURCE: No sound on NON HD channels
I had the exact same problem on a brand new Insignia 26 " LCD with DVD. Comcast tech was able to fix it by changing the Comcast box diagnostics. Here is what he did. Using the Comcast remote with the TV on - press power, cable, menu in that order. A comcast diagnostic srceen will appear. Select Additional HDMI options, then audio options. Change the audio options to L-PCM. Press power again to exit the diagnostics. That will fix it and you get to use the HDMI cable.
SOURCE: sharp model lc19sb25u sound and no picture screen
Part called main unit failed and require replacement. part number duntke352fm02.
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