Samsung TV Model LN32A450CIDX wont power on but red standby led is on?

OK led is on when plugged in but no pic or sound cant turn on with either main power button or remote bought it in 2009 with warranty and 1yr to 2yrs later the thing died and they replace power baord which did not work same with replacing main board so they replaced t-con board and boom worked until about 2 months ago i turned it off and didn't come back on then it did 2mins later then a week ago i turned it off after being on for 2 mos straight now will not turn on again just replaced t-con again and nothing so what could it be how can led light be on and when i unplug t-con while powered on i turn it on and sound beeps and backlight is on help please

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