No picture come out

Please check the fan

probably the main board defective, see links below
press the helpful button
http://www.repairfaq.org/samnew/tvfaq/tvtmmqcs.htm

TV REPAIR for Beginners How to troubleshoot

Suddenlink Help Troubleshooting tips on basic HD video issues and problems

Samsung TV Won Turn On Has No Power No Standby Light Samsung LCD TV...

lcd panel is deffective..

Hi. Try plugging in an external speaker just to test the issue. It could be just the speaker of the laptop is having the problem. If you were able to hear the sound from the external speaker then the problem is the built in speaker of the computer. If there is no sound coming out to external speakers. Try to reinstall the driver of your soundcard.

I w having this same issue when watching a Blu-Ray disc. I found it to be dependent upon what picture mode the TV was set to. By this I mean certain picture modes would cause the TV to dim during dark scenes of a movie. Changing the picture mode helped a lot.

There is a fuse in tvs I've had to change one myself

My TV had the same problem. I called Sony yesterday and they told me to reset the TV. I did so yesterday, and it seemed to work. Here is the transcript with instructions:
Please turn ON the TV. While holding down the RESET button on the Remote control, press the POWER button on the TV. The TV will turn itself OFF, then back ON again. Release the RESET button.The TV will go thru the initial setup, and should work normal.

hold down the power button untill it beeps twice. about 3 seconds which should restart the settings to the default composite settings. from there you can change the settings back to hdmi or whatever you had them at before.

At five years old, I doubt it will be worth replacing the power supply , a picture tube or two and possible the signal board. Cut your loses and get a new set.

sounds like a power supply7 problem such as a power regulator is bad or maybe the Horizonbtal deflection cu8rcuity is defective. sounds like something if you ask me? should be taken care of by the pros??? Im sorry not being able to assist you better but these sets have hundreds of volts nin them and shoulnt be played with by an unauthoized service company.. Good Luck