I have 42in Kdf42e2000 and it keeps cycling on and off. it stays on for 45 sec and the shuts off power light blinks for 42 times then it goes back on and the cycle starts again. Does anyone know what could be wrong

Sony eSupport KF 60XBR800 Support This may help

the best thing to first is to replace lamp ..lamp will also cause this..this will be the cheapest route to go first..Please let me kno and I will give you more info or docs from Sony...

1. CRT or LCD?
2. Do you have an image of any kind for that 45 sec.?
When it drops out after 45 sec, do you have any strange behavior as you look at the screen (colors, blinking, lines, squiggles, noises, smells)?
3. When failing, does the power drop out (ON light goes OFF)?
How long do you need to wait until you can turn it ON again?
4. What is the status of your screen saver/power saver? 45 sec seems pretty short but it's still possible.
5. What does the manufacturer's website have to say about this problem? What do other users have to say when you search for your model?

I know these are just more questions but your question is too generic to offer specific comments that might be more useful.

Yes, its symptom of weak lamp that has been reached to end of its life. If lamp has not been replaced in last 2-3 years, replace it to solve tv issue.
Thanks.

Power supply board have dead capacitors.U know how to solders?Buy these capacitors to replaced them to have power back.Or u can buy a whole power supply board for the replacement at these websites Shopjimmy.com,Ebay.com for refurbish power suppply board.

If the TV cycles 3 times then shuts down or the picture goes on and off then I suspect you will need to replace the projection lamp. The part number for the lamp is F-9308-750-0. Please take a few moments to rate my answer. Thanks....

did you find out the answer to this problem as we have the exact same issue? thanks

Maybe the probles is with the ballast. the ballast # is A-1247-118-A, no longer available, the replace ballast # is A-1247-19A, is the same.

Blue shadow at bottom of tv

when the light goes red it should be blinking a two digit code and repeat itself continuosly. slow blinks are the first digit and fast blinks are the second digit