The tv shutoff itself after 10 sec of being on, i already replace the power supply board and stil does the same thing
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It sounds that the fault is with its main digital board. A start signal should come to the P/S board, from the main board, after the set is powered ON. Check whether this voltage comes to it. Refer to its repair manual for details. To get some details, http://electronicshelponline.blogspot.com/Pull up older posts.
Testimonial: "i just replace a brand new P/S board. there are 4 boards on the back, i dont think it the T-con and the backlight inverter board, because the screen wasnt distored. So that leave the main BM3 board left,i cant seem to find on how check the voltage. Please help"
SOURCE: Tv cuts off and green light flashes
If your set was manufactured around July 2005, you may need a firmware upgrade to solve this issue. On the Sony website you can enter your model # and serial # to see if you TV is affected. If so, it is easy to have done and may be free from Sony. It sounds like the issue they described in the writeup on the required formware update. I had mine done within few months of when i bought it (purchased in Dec 2005) and it has been working flawlessly since.
Good luck!
Donnieboy999
SOURCE: I have a KDL52s5100 it is not working(no lights,
make sure that all the voltages in the power supply output are present before connecting to the control motherboard. also confirm that the cables supplying the voltages to the motherboard are all matching e.g do not make a mistake to connect the 3.3v cable to the 12v terninal. just be cautios and your system will power up
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