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Sony sets have several protective circuits that blank the screen if something happens that might damage the picture tube. One of the more common causes is trouble in the vertical output circuit. Given the age of your TV (the XBR models have been around a while), this might also be a symptom of a picture tube starting to fail. Most of these sets have circuitry (called AKB) that adjusts the color drive signals to the picture tube to keep them balanced. If one of the colors is enough out of range the screen will blank. It might be the tube itself, or failure of some part in that AKB circuit. The set might also have defective parts in the input switching or video processing stages.
Unfortunately, I can't suggest any place you might look if you want to try repairing this on your own. This kind of trouble usually needs to be diagnosed and repaired by a professional TV technician who has the service information to track it down.
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This could be a scan amplifier failure, and there is a loss of high voltage to the CRT. Part of the power supply may have also failed. In these sets, if the CRT emission goes low in emission, or the CRT goes defective, the bias supply to the CRT will go in to protect.
An experienced TV service tech can troubleshoot the set and give you an estimate for service. Considering the age of the set, the cost of service may not be worth it.
The 7 blinks indicate a high voltage shutdown (high voltage exceeded 33,000V). This is usually caused by a defective regulator. Could you please post the exact model number (KVxxx) and I'll look up the part you will likely need?
Sorry if that sounded kind of kurt. All that i ment is that the price of repeadly fixing an older tube tv may start to outweigh the price of a new flat panel tv. Also samsung (if you like that brand) is still making high definition slim fit tube tv's. Which is an older technology driven tv with new bells and wistles. Also sony's XBR line is an absolutely fantastic tv. When tube tv's were being mas produced sony came up with the XBR line and have been using it ever since. If you can find an XBR series tube tv for a reasonable price you can bet on the fact that it will be a phoneminal tv without spending the mass amounts of money on a flat panel. But as for the repeated burn up of your transistor i cant be of much help. And if thats all you care about doing is fixing the tv you already have well then i just wasted a few min. of your life. I wish i could be of more help on this.
TV Repairman came out today to look at my Sony KV-36XBR250 today with the exact same problem - he was able to adjust the settings through the service menu, but said it was a temporary fix only.
The picture tube is going and the Sony circuitry has a "video mute" that it uses when it senses the tube is not warmed up enough. The degraded state of the tube causes the blinking on and off as the signal from the tube wavers.
He ballpark estimated the tube replacement cost well above the price for replacing the set with a 37" LCD, so it's going to the dump...