Sony troubleshooting Television plays for about 30 seconds then goes black without any sound for about 30 seconds. After 30 seconds it comes back on and repeats the cycle. Do you know what is causing this problem?

SOURCE: TV turn on and off

Your TV has a power problem, it maybe high or low supply voltage that causes the TV to turn it self off because of an error. A technician from the manufacturer knows what error it has just by looking at the flashing standby light. Best is to take it to an authorize service center for repair... ^_^

SOURCE: Sony Bravia 40 inches has a defect

More then likely your power supply failed. If you do not hear a click from the relay during the power up cycle then your power supply failed.

SOURCE: KDF-E55A20 red light blinks 5 times

it works!! First i took off the front panel. Just check your manual for instructions, very easy to do. If you do not have a manual just down load one from google.. The instruction are easy to follow. The screw they have you loosen with a alan wrench is attached to the plastic, so you do not have to worry about dropping it inside the tv. Removing the lamp was simple. once out you will notice on either side are two small mesh screens. One of mine was 80% blocked with dust, the other side was only 30-40% covered. I used a vacuum to remove the blockage, i did not want the dust and dirt to go inside the bulb. i then cleaned all around the lamp. Reinstalled, and we are go to go. The kids are happy and i am happier since my wife not be buying a new TV. if this does not work it is time to replace the bulb.
total cost of repair $.00
time required to fix, less than 15 minutes.

Also when my TV was loosing sound and picture and then return. I did turn off my TV, then turned on. I nothiced a red blinking light. Mine flashed 5 times. After some reserch, 5 times is video related, bulb or video board. google red flashing light with the model you have and you will find what all the codes mean.
So if yours is flashing 5 times try the above, it might work for you and it is well worth the time before you call a tech and drops hundreds of dollars.

hope this helps.

SOURCE: television problem

Try changing the lamp, as sometimes an old or weak lamp will cause this symptom. USE AN ORIGINAL SONY LAMP as the replacements are unreliable

SOURCE: Sony 60' projection model # kdfe60a20

I finally wet out and bought the tv repair manual. Thought the problem had to be more than the bulb because i was losing sound too. Everything in hte repair manual brought me to the bulb or the ballast. I ordered a replacemant bulb. I spent about 150, which included overnight shipping. I replaced the bulb just before Thanksgiving and haven't had any problems as of yet....