Samsung 40 inch led tv model no f6400
These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. Viewing it in "Mosaic" or "Sidebar" will make surf easy.
http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.
SOURCE: my sony bravia tv is flashing red stand by light
Try leaving the TV unpugged for 30 minutes so the TV can reset itself.
If that doesn't work, most likely the TV has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you flashing red light codes, circuit diagrams, test points, and part# lists. Usually, cost under $20.
I hope I shed some light on the subject for you.
SOURCE: 42PF7321D/37 LED Light Blinking RED
my dad had this happen too. after some research, we found out that there are two capacitors on the power supply board right next to the connector for the main logic board that went bad. you can just pull those out and solder in new ones, and it works like new again! i found a repair kit on ebay for $35 including shipping, and that's all it took!
SOURCE: My tv won't turn on, the red light just blinks and
power suppy needs replacing...according to samsung and other forums i read when mine did this its a common problem
SOURCE: My hitachi plasma tv model: p55t551 every time i
turn tv on the red power light comes on then goes off again
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