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tv off then back on has screen for 3 seconds

tv off then back on has screen for 3 seconds

My P42647-02 has channel display on start up for 3 seconds then blanks out, turn tv off then back on has screen for 3 seconds, however there is no back light , It seems to me that a componant is shutting down after the 3 seconds. Does this make any sence to any one John 8-25-18

ANSWERS:

"john downing  Your model is equipped with a power failure detector. If it has a failure of the power circuit for either the analog/digital circuits or voltage failure for the LVDS it will turn of in 3 seconds. '

You can determine which circuit causes your TV to shut down by measuring the voltage on the CPU IC801. Check the diagram

The turning of at 3 seconds is not the cause but the protection for further damage to your TV.

This could be a main board as well as a power board issue. You need to let us know if you have any sound wafter your TV turns black. It is of course also possible that this is a backlight issue. You will have to remove the back of your TV and take a look at the boards. I start with the power board and check the voltage to the backlight array. If your main board does not send a signal to turn the lights on etc. you will not have the voltage going to the backlights. If you never get any sound then the focus should be on the main board and not the backlights. Post some pictures of all of your boards etc. with your question. That way we can see what you see. Adding images to an existing question"

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