This sounds like the same problem I have with my 52" Sony KDL52XBR6. Its probably the TCON panel. Sony apparently knows of the problem but will not assist, I've tried. To make matters worse they don't sell the components and everywhere I have tried they are out of stock. My past number is 404652ASNC6LV4.5 they call it a LCD Controller. Just Google the issue and you can find youtube videos that show the same problem.
To be honest, it won't be a cheap repair. You could be looking at an aging backlight inverter or possibly the CCFL bulbs that light your tv are aging as well. The backlight inverter would be nearly $60-$90 and the CCFL bulbs are close to $20 each @ 12-14 of them.
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