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That problem is usually cause of faulty capacitors on the power supply board..
Just follow this instruction to fix your TV..
1. Open the back cover of your TV. 2. Look at the power supply board..Its normally connected to the power cord.. 3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors.. 4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value.. 5. Some of the capacitors not bulged so its better if have a capacitance meter
That problem is usually cause of bad capacitors on the power supply section..
As you stated your TV works fine and after a minute the red light comes on...
That symptoms is cause of bad capacitors..Normally bad capacitors can check visually if the capacitors look like leak/bulged on the top that is the indication of bad one but not all bad capacitors are bulged some are not so in that case you have to used a special meter called capacitance meter..
Have you reseted the lamp timer of your tv? if not, you should do it, because it's just adding more and more hours to it to the ones it already had and it's indicating the tv that the lamp is going out, reset the lamp timer and you should be fine, if not, it's probable you might have a defective ballast which are not expensive, they're way cheaper than a lamp, they're running around 70 dlls
Hi Its symptom of weak lamp so TV needs new lamp. Lamp replacement procedure is written in user manual and lamp part number is as follows.. F93087600 Lamp Block XL-5100 Available in Sony Accessories Store, please buy Sony Original Lamp for TV safety.
your lamp bulb is probably finished so get a new lamp bulb they are easy to replace just look for a small panel on the side of you tv all you need is a flat head screw driver to open the panel and you should be able to pull out the lamp bulb