The Lamp lights up for about 20 sec. and then go out.

The lamp of course would be logical to suspect---the only suggestion I have as have seen this before is some of these sets if enough dust inside will do this---seen ones that would play twenty minutes and either shut off or off and on.

Seen dead ones also where dust on the fans slows them just a little-set monitors things like that===usually we take back off and set outside with a air compressor and clean all air channels out (air gets taken in from front area and exits rear).

It at worst will rule this possible solution out and at best may resolve the issue. Seen say fifty or more sets where after cleaning with air (no matter how clean the house is it may look like a dust storm when you air it out) the issue was gone.

One even had golf ball sized white spots in picture--dust inside the two month old set's light engine.

Good luck and I hope it helps as it cannot hurt.

Hi,
Question shows it is Sony KDF-55E2000 lcd rear projection that has lamp inside as back light source, when this lamp reaches end of its working hours life, it starts such problem.
If lamp has not been replaced in last 2-3 years, then replace it to solve this picture issue, lamp replacement procedure is easy and written in user manual of tv, please buy Sony original lamp from nearest Sony Store for good picture in tv.
Thanks.

Hi,
Replace its lamp as existing lamp has been reached at end of its working hours life and need to replace to solve this issue. Please note lamp is not not broken or dead yet so you do not see lamp light on tv front.
Lamp replacement procedure is easy and written in user manual.
Please buy Sony original lamp for god picture in tv.
Thanks.

Power LED flashes orange 1 x 5 secs. = 1 of 3 fans stopped. TEMP LED flashes 1 x 5 secs, = Temperature error. Lamp LED flashes 1 x 5 secs. = lamp ballast error. (check lamp 1st.)
Hope this helps.

Hi,
TV will show Lamp Light warning if lamp got broken or dead.
Symptoms of TV shows lamp is weak and will be replaced. Weak lamp consume more current than allowed ratings and causing activation of protection circuit that shuts off TV and TV turns on again itself, that is why no blinking red light.
Please replace lamp in your Sony KDF-E55A20 TV, lamp replacement procedure is easy and written in user manual, click Sony Support to download user manual copy, if required.
Always buy Sony original lamp for TV safety, Sony original lamp is available in Sony Accessories Store for $200 with following part number..
A1085447A... LAMP BLOCK ASSY XL-2200U
Hope this info will help you.
Thanks.

sounds like you may have the wrong bulb and it is being overpowered.

Have you ever changed the lamp?If not that's where you need to start.Also recheck your model# as I believe it to be in correct.The lamp code is on a sticker on the left side of the tv if it is a Samsung

time for new lamp bro!!

if the new lamp doesn't have a problem, then it's not the ballast, it's just a bad bulb. especially if you didn't get it from infocus. the cheaper lamps don't last long. you get what you pay for.

Definitely sounds like a power supply problem. Check with your local TV repair/service center about getting it repaired or replaced.