It may have bad 24vdc power supply, T-CON board, backlights inverter board.
\012Look for bad caps with domed tops, see example of failed 2 years old SAMSUNG due to bad caps; http://s807.photobucket.com/albums/yy352/budm/Samsung%20LN32A330/
\012Try this first:
\012First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
\012if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.
\012If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
\012Basic LCD monitor and TV troubleshooting guide:
\012Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
\012Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
\012Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
\012Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
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