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It sounds like the lamp has failed. It is advisable to use a genuine Sony lamp. The part number for is XL-5200. It will cost around 180.00. That should fix you problem. If you cannot find the lamp local to you can order it form Sony at.
I hope this help,
Ur tv have a problem known as convergence problems.Ur tv convergence board must have it 2 STK convergence ICS and some or all it resistors to be replaced to solved convergencce problems.The shop will cost u $300-350 for parts and labors.
You probably have a bad BLUE CRT. Due to the cost and the length of time it would take to repair, I would not invest the money into it. It would require a Qualified Service Person to come to your home and remove the BLUE CRT assembly and send it back to SONY to be rebuilt. Estimated cost would be around 800.00. I would check prices of a replacement set.
I hope this helps,
The problem sounds to be in the power supply board. May also be a horizontal drive problem. Sorry I can't be of more help, but there are may voltage problems ( shorts, open capacitors, bad chip etc ) that couls cause this problem. The reason the set turns blue when it first comes on is that it doesn't have time ( or can't find a signal and the screen default to blue. Wished I could help more.
Your blue crt has a short - you can verify this by unplugging the socket from the blue crt and powering up the set and you should see a yellowish looking picture with just the red and green crt's operating. You can try turning down the screen control pot (B) for blue with the blue crt on (just to the point where you no longer see retrace lines in the picture on a blank input)Sony has had a lot of problems with the crt's on these models and sooner or later all the crt's will fail - For a permanent repair all must be changed.