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May mean the DLP chip is either not getting the proper level of black signal until the controller board has warmed up, or the DLP chip itself is not completely responding to the controller signals. After thoroughly warming up the problem goes away. This is a sign of aging of the parts. Diagnosing and correcting that type of problem is a challenge. Regards.
Thats a very common problem with that model which is caused by the small signal board needing replacement. Several version of small signal boards were used in that chassis but the people at www.tvrepairworld.com have replacement signal boards and will help you determine which version you require for your specific version if your not sure.
Thats the small signal board. You can get a new replacement small signal board at the following link for several hundred dollars cheaper. Leave them a emai with what you need they respond quickly. www.tvrepairworld.com
THERE is no convergence ICs on these sets it does have convergence board it has serveral ALuminnin heat sinks on it If comcast was at fault it would have fried your SSB board which will shut TV down Cost of Board is 352.00
the part number is 259307 for the ITC222 chassis its over 300.00 for the board although you can get one at the following link for about half that price. They dont list them, But they have them you just have to leave a email this is what the small signal board looks like. http://servicemanuals.vstore.ca/
replacing the board requires no set up so it should run after replacement. as for the other problems that is unknown until you replace the parts you know are bad. it tough to say if any other boards were affected.
I have seen this symptom a lot recently. There is a 9 volt regulator on the small signal board, and the output voltage on this IC has dropped down to about 8 volts, which causes that symptom. Replacing that regulator should cure your problem, and when I make a housecall for a set like that I charge $150, although I hear that the average service center charges a lot more than that. I also believe that it is never a good idea to leave a projection TV on all the time, so whoever told you that has no idea what they are talking about.
You weren't very specific about your problem, but assuming you've tried different inputs and tried messing with the convergence setting, it may indeed be the signal board, and you may need to have it replaced. BTW these sets also have an issue with the dynamic focus circuit and with crt fluid leakage. Make sure that you do not have a fluid on one of the crt boards. And as always with repairmen, a second opinion couldn't hurt.