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7 time blink of power light indicates hardware failure and it occurs due to Scan Drive Circuit and Connection between the SC board and the SM(SU/SD) board. There are few possible reasons as follows..
Abnormality of the scan circuit output, the 15V_F, the scn_pro, and Vscn circuit.
Loose or open Connection between the SC board and the SM(SU/SD) board (SC41, SC42, SC46).
Open or loose connection between connectors SC2/P2
Wrong diagnostic by the A board
Defective Display Panel
Mostly SC or SU and SD boards found defective for this problem. Please reply back if you wish to troubleshoot/ repair this TV by yourself to assist you further but you should have multimeter meter and basic electronics knowledge to proceed further. If you are not comfortable working on it yourself then you may please use following link to get list of TV repair shops in area which will help to get repair quote that could be $250 to $350...
I trust my input will help you out. Please feel free to respond if you have any additional questions.
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