lg led tv model number 43uh651v has only power blink 3 times after no videoand no sound

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anwaraberra
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lg led tv model number 43uh651v has only power blink 3 times after no videoand no sound
lg led tv model number 43uh651v has only power blink 3 times after no videoand no sound power supply is ok when i turn on the tv from standby i can access from control panel or remote control but after its red umber light blinks three times nothing comes/no video no audio / and to turn off i can access only from remote control i can't access from control panel.i got one bad backlight led however after i change it the problem is still the same. please tell me what i have going to check thank you so much...
 

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