SOURCE: Samsung LNR408DX/XAA Powers on with sound but no picture
I think you need to exchange the Main Board.
SOURCE: Samsung LCD TV doesn't power on, just blinks 5 times
After about 5 years the Samsung LCD televisions backlight fails which prevents the TV from coming on and the powerlight just flickers the backlight can be changed but it is often alot easier and cheaper to buy a new Television
SOURCE: Samsung model LNT5271f excessive relay cycling before full power
Howdy,
Yes, it is very easy to repair. Solder iron wattage should be at least 300 w.
The PSB is the center Board (towards left) after you remove the back off the TV. Remove the shield that covers the Boards and remove Board from TV with the 6-7 screws. Replace capacitors CM852 & CM853; 2200ufd 25volts.
Good Luck, big IRISH.
Testimonial: "Great fix"
SOURCE: Which Replacement Power Board for LNT4665F Samsung LCD TV?
Howdy,
It would be a lot cheaper if you just replace the two caps that have gone bad. Just get a cheap solder pencil from the store and about an inch of solder and you are in business.
The Power Supply Board is the center Board (towards left) after you remove the back off the TV. Remove Board from TV with the 6-7 screws. Replace capacitors CM852 & CM853; 2200ufd 25volts.
Thaks for using FIXYA, BIG IRISH.
SOURCE: Samsung LN46A550 LCD power on/off
Apparently this is a known problem with flat panel TVs made a few years ago due to bad capacitors in the power supply. This same problem appeared in computer mother boards at about the same time so that the capacitors went open or shorted causing problems.There is videos on You Tube that addresses this problem see: http://www.youtube.com/watch?v=ZccykxrtX9g as a starting point and look around for other repairs
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