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Hello, Our Sony TV KV28WF1B switches off automatically, and the led blinks twice. If you cut of the power for at least 5 hours then TV starts again. Somebody any idea what this is, is it easy to solve, what shall it cost and is it worth it. Thanks,

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It sounds like a power supply problem. You need to check the capacitors on the power supply pcb. This is the board with the power cord connected to. If they are puffed up, you will need to replace the capacitors with equal or slightly higher values. The values are in mfd and voltage. It is printed on the caps. You will need to remove the back to get access to the pcb. To do this you need to lay the tv face down on a flat surface preferably on a table with a blanket for cushion. You need a table big enough to support the whole tv by the frame. This is to prevent damage to the panel. Then you need to remove all the screws securing the back to the frame. Give it a visual check and if the caps look good, then you need to check the voltage level on the outputs. These are printed next to about three connectors on the pcb in the same general area. If the voltage levels aren't there, check to see if you have standby boltage anywhere on the connectors, which should be 5VDC. You will need a multimeter for this. Connect the black lead to chassis ground and use the red lead to test for the voltage levels. If you have 5VDC anywhere, check a voltage output by placing the red lead on it and powering up the machine. If you have a momentary voltage value equal to the pin on the connector, then suspect the main board.

Posted on Apr 03, 2011

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