Question about Sony Grand WEGA KDF-42WE655 42" Rear Projection HDTV

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Tv going off and on

Need help with my grand wega, it keeps cutting on and off every second.

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  • dpcorliss Jul 23, 2008

    We have a KDF-E55A20 that goes black every few seconds. We took the back off and it's the lamp that goes out, which was recently replaced. Any suggestions? Sony repair will cost 100 bucks just for the visit and the TV isn't even 3 years old!

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I have heard of problems with the projection lamp connectors. Try plugging and unpluging the lamp in numerous times, or clean, scrap metal prongs with a hobby knife or small jeweler's screwdriver. Both male and female, if possible. Also check interlock switch that shuts off DLP if lamp cover is removed. Maybe intermittant? It protects your eye's from UV. It will be closed with lamp cover removed. If you remove cover, and manually close this switch, don't look directly at lamp for to long! Check with ohmeter while manually closing switch. Unplug TV first, of course. If these check OK, Probably intermittant Power Supply defect.

Posted on Jul 24, 2008

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TV WONT COME ON AND THE LIGHT KEEPS FLASHIN RED AN GREEN ON THE STANDBY BUTTON


  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.



Read more: How to Troubleshoot a Sony Grand Wega ' eHow.com http://www.ehow.com/how_5243554_troubleshoot-sony-grand-wega.html#ixzz1EoY37gpC

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The protection circuit is cutting in and out and it is really just a high current detection system.
This is very typical of loose connections and cold solder joints which are easily diagnosed by giving the set a whack with your hand in a few strategic places.
Also check the fuse on the power supply board .

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the tv will try to reboot a few times. just let i try and eventually it will start blinking red. if you could count the red blinks then i can further assist you.

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