Thank you for posting your question on Just Answer! I will be happy to help you with this problem. Can you please give us some more information so I can better answer your questions.
-can you get the full model number for the Dell television? (this can be found on the back of the unit)
-How old is the unit?
- Do you have this problem while watching all different devices hooked to this television? (DVD player, cable, satellite, game counsel, ect.)
-How thick is the bar?
-Is there any way you can post a picture of this problem so I can see it for myself?
(if you can post a picture, please click the icon above where you are typing with the green tree on it. This will allow you to upload a picture)
Please give me this information and I will be happy to assist you further.
-If you press the menu button on the tv itself, does the menu show normal or does this affect it as well?
What you are describing here is actual consistent with that of a LCD panel failure. This is not good news, because the LCD panel if available is always more money than just purchasing a new set. I wish I could see it for myself so I could be 100% sure but from your description I am about 95% sure that what you are describing is a bad LCD panel. Especially if the problem only exists on one side of the screen, this is a common failure for a panel.
I did notice in your original question you were asking if the LG model was the same as the Dell, well I have been unable to confirm this, but I am curious as to why you ask, do you have a LG that you have found for parts?
I am sorry to give you bad news, I know you were hoping for a better diagnosis than that but unfortunately these LCD panels fail a lot more often than we would like. Please let me know if there is more that I can do for you.
I you have any further questions, or would like more information, please do not hesitate to ask.
Also please never accept an answer until you are 100% satisfied, we have met all your needs and you feel that you can leave positive feedback. If we have not met all the criteria here please let me know and we will continue working on your problem.
These new sets are not exactly like the old ones where there was a horizontal and vertical sync, now days everything is done by addressing to the panel and lighting a pixel.
There is a slight chance that you could have a bad main board, but I will tell you 98% of the time when I see this type of an issue it is caused by a bad LCD panel.
If you wanted to try something you could re seat the LVDS cable and see if that helps the problem. On the top of the set there is a thin connector that plugs into a circuit board in the dead center top, take this out and re seat it.
Let me know if it does any better?
Ok sounds good, let me know what happens.