Question about Sony Grand WEGA KF50XBR800 50" Rear Projection HDTV-Ready Television

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Grand Wega picture going on and off; standby light flashing, sound remains on

We have a sony grand wega kf50xbr800 50 inch projection TV that we purchased in late2002/early 2003--I need to look at the records for the exact date.  We have had to replace the bulb once, but I do not remember this issue before.  The TV will turn on normally, but after a few minutes, will go out.  The standby light will blink repeatedly. Then it will come back on for a few minutes, and repeat the cycle again.  The sound remains on.  It does this in TV mode, as well as playing videos, etc.  Am I just not remembering that it does this when the bulb is going out, or could it be something else?  Thanks for any advice.  I will order a new bulb, but want to make sure that is the problem first.

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Is the cooling fan running properly?  I'm just guessing, but it sounds like it could be overheating and shutting off, which allows it to cool off enough to turn on and overheat all over again.

Posted on Jan 08, 2008


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  1. If your Sony Wega will not turn on, the front green light blinks, you hear a faint whirring sound and the green light turns red and flashes, it probably means the lamp inside the set is no longer working. If you noticed the screen beginning to dim in the preceding days or weeks, this most likely is the cause.

  2. If the green light flashes and the picture comes on momentarily but then goes off, and the green button flashes until the set restarts, then the seal around the lamp mount is loose and needs to be refitted.

  3. If the picture on your Grand Wega cuts in and out and the green standby light flashes, both of the set's STKs need to be replaced. STKs are small chips on your television's circuit boards and are identifiable by their labels. The specific STKs used in your Grand Wega TV will be identifiable by the numbered labels on top of the STKs.

  4. When you plug in your Sony Wega and hear a loud popping sound, it's probably caused by a defect in the high-voltage circuit. Let the professionals take care of this one.

  5. If, after turning on your Sony Wega, you can hear your set but the screen is black, you most likely need to replace your projection lamp.

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