Hi,
If it is Sony Grand WEGA KDF-55XS955 tv then it needs lamp replacement as existing lamp in tv has reached at end of its working hours life and causing this problem.
If lamp in tv has not been replaced in last 2-3 years then it is time to replace it. Lamp replacement procedure is easy and written in user manual.
Required lamp part number for tv is as follows:
A1085447A ....
LAMP BLOCK ASSY XL2200U
Available in Sony Accessories Store for $200
Please buy Sony original lamp for good picture in tv.
Let me know if you have additional question.
Thanks.
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