can someone please help me as i landed to this website and i see alot of smart people here.. unfortunately since my account is new and yes i have read the welcoming thread i cannot post a new thread as of yet so i am posting here for some help...

46L5200U - C toshiba 42" LED


when the tv is turned on all is normal and via antenna left it on over 1 hour and no problems. but when i circle to media player or connect hdmi the video feed is on for 3 secs approx then flickers 3 to 4 times and led goes black. audio is still functional with black screen.

stupid Q: current software is dated march 2012.. and i have tried updating via toshiba website but was unsuccessful ... regardless i believe the problem is in the video board unit as on hdmi i see the tv making the colors more florescent and then it trips out..

any help would be appreciated

thanks