Tv turns on but no picture or sound. Blinking led no picture or sound. Sometimes there can be picture related problems. After purchasing the REPAIR SERVICE we will send you the address and other contact information.Please send us your not working main board and we will test it, repair it, test it again then send it back to you. Please package your board appropriately. The item "LG Main Board REPAIR SERVICE 55LM8600 47LM8600" is in sale since Thursday, May 30, 2019. This item is in the category "Specialty Services\Restoration & Repair\Electronics". The seller is "mcltvrepair2" and is located in Katy, Texas. This item can be shipped to United States.