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Unplug,replug the tv and the cable box both back about an hour later to reset both devices.The tv now should get it broscasting signal back.Not,than the Tuner board,that the board where the incomming broscasting signal wire plug in is the problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish Tuner board for the replacement.
There no lamp for the LCD tv.Only have LCD inverter backlight board for light for picture.This problems usally have sound,but no pictture.It that ur problems?It a long board in shape.Tries Shopjimmy.com,Ebay.com to buy refurbish board.
Both power supplies are supplying the same voltages to the circuits but in order to use the one from the NS-27LCD 27" you will need to change the wiring configurations to make it work for the LCT2715..
I could repair the power supply from the LCT2715 for under $90.00 including parts, labor and shipping it back to you.
Let me know if you require further assistance.
you need to inspect the board, most of the time you can trace the problem according to a deformed component.... bulged capacitor, burnt component (black dust on component and board) or if it's an IC crack or chipped ...