My Samsung LN40B500P3FXZA LCD HDTV will change from HDMI/CABLE to PC to HDMI BluRay TO AV to CAMCORDER all on its own. The red light would flicker constantly, as if the remote is being used, but that is not the case. I cannot use my TV remote. Whenever this happens, I would need to manually control the tv by pressing the buttons on the right side of the tv.

SOURCE: Samsung ltm1555B - lcd tv blinking on button

I am having the same problem with the blinking orange light

SOURCE: using my Samsung LCD TV as monitor for my Sony Vaio Laptop

yes sir..i think you must looking and buy VGA adapter 15 to HDMI complete with the HDMI cable set. you can find this adapter at the computer spare part store or electronic part store. not cheap but very usefull for you in the next day.
is very easy to connecting...plug you adapter to the output VGA VAIO.. connect the HDMI cable to adapter (like USB) and the rest to the input at your samsung lcd...good luck..

SOURCE: Samsung LN-R408D - No Picture

My Mom's LNR408D also had sound but no picture. I was able to fix it by soldering in a jumper wire across a blown (1.5A ???) SMD picofuse on the "T-Con" board.
Consider attempting this ONLY if you: 0) Know enough to avoid the potentially fatal High Voltage parts of the power supply board!!!
1) Are a fearless hackazoid 2) know what you're doing with a soldering iron and teensie SMD parts 3) are gonna throw the busted thing out anyway so you have nothing to lose and won't be sad if you screw something up.
4) Know enough to avoid the potentially FATAL High Voltage parts of the power supply board!!!!!


This board is at the top center under a close fitting RF shield. The suspect part was labeled "CP" on the board and marked with "P" on the part. It is visible above the right-center of the connector from the main board. An ohmmeter showed it as open, so I bypassed it with a jumper wire from connector VIN to the hot side of C13. One image shows the suspect part and the jumper in place.


The other shows the TCON board placement top-center (under its RF shield). With care, it seems possible to test the fuse and put the jumper in place without removing the shield. (Obviously don't touch anything else with the VOM leads!)

Thanks to ZORBUS and Steve's TV and Electronics for the idea.
http://www.avforums.com/forums/lcd-televisions/892447-no-picture-but-got-sound-my-samsung-lcd.html
http://www.gesda.com/transformer/Fall08_files/Page336.htm
Steve C

SOURCE: hi my samsung lcd tv model le40s8, it won't switch on

if you can do soldering work, replace two 1000uF10v bulging capacitor with 1000uF 16v or 25v in powersupply board. you will save $200.

SOURCE: my 32" Samsung lcd tv won't turn on, led is solid red

The Main bd is bad. It is not sending a turn on signal to the power supply.