That sounds correct, the main board is bad (the backlights ON signal is stuck low so it will not turn on the backlights board) and no way the repair shop will have the proper tools to do delicate surface mounted repair works. Mian board is not cheap, I would sell parts on EBAY nad spend the money on new TV.
I have seen less thane two years old TVs that go bad already, they do not make it to last.
Basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
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