Go to the back of your owners manual and find out how to do a system reset. I had the same problem, on mine I held down the reset button on the remote while manually turning off the tv. The TV went off, then came back on. It's working perfectly again.
Vertical colored bars are a communication problem between the light engine and the q box, You could have a bad lvds cable which is what they communicate through. Unfortunately there are specific diagnostic steps a tech will have to do to determine which one is defective. and the results of the testing are not always absolute. I have had to diagnose this issue before and it requires bringing up video patterns that are located in the light engine micro and the q box micro to help in isolation. I cannot give you a good estimate on repair because the q box and light engine are extremely expensive. If you are lucky and it is the lvds cable it would not be much to repair around $150 or so.
this morning my sony kdfe55a20 was working fine.. sudden loud popping sound and picture/sound gone.....
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this morning my sony kdfe55a20 was working fine.. sudden loud popping sound and picture/sound gone.. green power indicator light blinking.. then i could hear a buzzing/crackling sound from left rear side of tv.. and smell something hot or like something had burned.. left off all day unplugged from power source.. just chatted with sony online (really not as helpful as i would have liked with no suggestions of problems) but plugged it back up to a different power source as directed no change in status.. green power light blinking continuously.. same crackling/buzzing sound from left rear of tv.. just trying to see if this is something i need to be ready to fork out christmas money to fix or replace....or if it is something that might could be fixed at home with the assistance of my electrician magician father-in-law and brother-in-law..
tv works fine for about two minutes and then picture and audio disappear. power indicator on the tv...
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tv works fine for about two minutes and then picture and audio disappear. power indicator on the tv is still on. After about two minutes it comes back on all by itself.
my tv works fine and then the picture goes black and sound goes out then the picture comes back...
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my tv works fine and then the picture goes black and sound goes out then the picture comes back clear adn the sound follows in a few seconds. Then the process repeats. Whats going on?