You'll need a qualified tech. Tried 1-800-SAMSUNG (if you're in the USA)?
My Samsung 40" tv (LA40S81B) is around 2 years plus old and is a made in Malaysia model.
One night the tv switched on by itself in high volume and woke us up, I came and switched it off and went back to bed.
From the next morning, the tv wont switch on ! the red led flashes five times and remain on for 4 seconds and again flashes for five times.
After a few days the tv switched on by itself again and worked for around 30 minutes!
After going through the forums I purchased 1000uf, 16V capacitors online and opened the tv but found al capacitors are good. Any how I changed all the 4 capacitors with 1000uf, 10V rating but the symptoms are same, no change at all. I then tried the EPROM reset found the forums but again no result! assembled tv back and left it switched on, and again a few days later found the tv is on! switched it off with remote and tried switching on again, but again the led just flashes!
Any one can help me please???