I have switched the main power off and back on - the screen still remains off. After about half an hour I switch the TV back on it works for a minute and then the screen switches back off.
This may not work but i had a similar problem. My 32inch sansui LCD TV would switch off after about 10-20 minutes. I had to unplug it to get it going again. So i decided to open it as the warranty was long gone anyway. Very easy to open the back. I checked to see if anything was "swollen" as some sights suggested, but found nothing burnt , blown or swollen. Then i thought about heat? So i left in on without putting the metal backing plate back. It worked! when i put the plate back.....20 minutes and it shut down. So i just left the metal backing plate off! And no its not dangerous as the sansui has a protective plastic backing, that covers the metal one, that is better ventilated and protects the bits and pieces. Its been a week now and its fine.
SOURCE: the color on my 32
Hello
Either your Sansui TVs screen voltage has gone very low, or its brightness control section inside its chroma IC has damaged. To make sure which is faulty, you have to open your tv. There is an LOT [Line Output Transformer], which can be locted on the main board of your TV, from which three wires will go to the picture tube, out of which one will be connected directly to the picture tubes upper side, look like as it is sucked by a rubber ******. Usually this component is balck in colour and will have two adjustment controls integrated with it, marked as "screen and focus". After switch on your TV, just adjust the "Screen" control preset a little clockwise to see whether there is any advance in the bright ness of the picture. If the focus voltage is less or its wire connection to the picture tube base socket gets corroid; this type of fault may occur also. Check that also. If these does not help you, the chroma IC has damaged, and should be replaced with same type and number. OK.
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