By your description it is hard to say. It could be the LCD Panel or a Main Board. Either one could cause the problem.
I recommend you to call Sony to see if they could get you in touch with a local Service Facility so they could better diagnose it. Sony may also be willing to help with repairs if the unit is out of warranty.
Their Phone # 1800-222-SONY.
I hope this helps,
Sky Assoc
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