Found a training manual, but my tv has an extra board (LED address, maybe?) not shown. Tried the power supply test procedure in the manual - jump standby to power on pin. Backlight is not supposed to light, but it does.
Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary. Fault to its main board. Short circuited component/s at it.
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