TV worked fine, then all of a sudden it went mostly black with some pulsing red blobs, mostly in the center of screen. The image isn't constant, changing shape slightly (i suspect with background image). The reddish blobs have lots of yellow and blue in them.
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Check your cables on the back of the TV and cable box. You either have it connected wrong, or they are loose. If you are using red green and blue, make sure that you are tightly in the red green and blue connectors. If you are using yellow white and red, then make sure you don't have the yellow in the green spot.
What kind of input are you using? If you are using 3 cables (white, red, yellow, then possibly your white and red (sound) are still plugged in but the yellow (picture) cable has come lose on the back of the TV or on another machine it is feeding from such as a DVD player or other equipment.
If the problem happens using different input and devices, then it is either the terminal circuit (input/output connectors) or the processing unit in main board. The terminals are unlikely the culprit if problem concerns different inputs.
I imagine that the picture is not properly B&W (gray-shades) but some kind of reddish, bluish or greenish picture as the LCD will process picture using RGB (red green blue) channels instead of CYMK (cyan yellow magenta black) like CRT TVs.
Test the TV using an external aerial. You will notice if the channels have the wrong color even from static.
Use different inputs, different cables and different devices. beware of SCART cables, the SCART contacts are very easy to break. A defective cable will loose picture. Better testing using AV cables and component cables. AV cables are red/white for sound and yellow for video. If the two-wired yellow cable does not work, then the TV is faulty. Other test can be done using component cables. Component cables send the three red-green-blue signals on different cables, hence testing is simple. Test swapping cables and see if TV tone stays the same if color tone changes the problem were the cables. Test also using at least two different devices (e.g. one DVD player and one TV receiver or a playstation).
If you find that the TV is defective call the manufacturer at the number listed on manual. If the problem is that one or more RGB channels do not work the TV main controller board must be replaced.
I have the same tv and the same problem, but my yellow is a cloud around the outside of the screen. My tv was recently moved, and a repair shop told me that sometimes in a move these tvs light engine takes a shock and causes a yellow "band" on the screen. I am hearing that these light engines are not cheap either. Hope this helps you.
It sounds like to me it is the Main Unit. Some of them are called BU Boards but they vary with Model number. This Board processes the Video before it gets to the LCD Panel. It also has most of the Logic and Microcontroller Circuits on it. So if it did not want to react to any commands, I think this is where your problem is. I would call Sony at 1800-222-SONY to see if they could help you find a Service Facility to assist you. They may even be willing to help with the repair.
Hope this helps,
I have a similar issue. Sometimes the entire screen goes black and sometimes only one-half - either the top or bottom half goes black. The only solution we have found is to gently tap the TV (usually the front side) and the picture will come back for awhile. It almost seems heat related as it only goes out after the first 10 minutes of use. There must be a fix to this.
Your lamp has most likely blown out. that is what happened to mine and once I replaced the bulb it worked just fine. this is one of the cheaper stores to find a replacement bulb, www.bluestar-online.com