[Solved] lg 47le5310 - with continuous beeping sound and shutting down

Hello,
i have lg 475310 , once plunged to power will start to beep none stop, then the set will come up and shut down , the funny thing is that the red light stop showing again, i tested the power and all voltage is fine, meanwhile this beeping sound is coming from the sensor board . only when i start the power through the main board, i noticed the main board ic F0513A voltage in one of the pin going up and down with the beeping sound. if anyone has the service manual please help

LG 47LE5310 - chassis LD01D
Service manual: https://elektrotanya.com/lg_47le5300_47le530n...d01d_mfl62863031_1002-rev00.pdf/download.html

Thanks a lot brother, for the service manual