Pn43d490 clicks blinks red light twice and will not turn on

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.
http://electro-medical.blogspot.com/

Those 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.
http://electro-medical.blogspot.com/
http://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

How many times this standby/power light blinks at one time switch ON? Count it carefully. These blinks are fault indication, and known as blinking codes. From the number of blinks occur at one time switch ON; you can get an idea about the faulty circuit stage inside the TV. This will make repair easy. For more information, check the link http://electronicshelponline.blogspot.com/. If the blinks continues, and non-stop, the fault should be with its main system control IC, and with the memory IC.

Samsung told me this was a common problem and I would have to have it serviced by an authorized repair facility.
My problem ended up being the internal power supply, but they also told me the main boards burn up.

set should have come with a one year warranty.

Hello
The three digit Sky remote code for Beco TV are:

514 398 065

Four digit code is:

0125

1* Turn your TV and SkyHD box on and press tv on your remote control.

2* Hold down select and the red button together until the red light on your remote

control blinks twice (this is after about two seconds).

3* Press tv again.

4* Key in your TV's brand code. The light on your remote control blinks twice.

5* Press standby on your remote control.

If your TV switches off, press select.

The light on your remote control should blink twice.

If your TV does not switch off, press tv, then press standby.

Repeat the sequence of pressing tv then standby until the TV switches off,

then press select.

If the light blinks three times, your remote control has checked all the possible

settings for the code you used. Check you have the right code and start again

at step 1.

*6 Turn your TV back on and press the tv guide button on your remote control.

The TV Guide screen appears, meaning the remote control settings have
been reset.

The Sky+ remote should automatically default to Sony TV's. Leave the batteries out for a few minutes and try again. The Code for Sony is 0000.
Or try this :-

With TV and sky box on.
Press the 'TV' button on the remote.
Hold down the 'select' and the 'red' button (of the four coloured buttons) together, until the red light on the remote blinks twice. (takes 2 seconds)
Press the 'TV' button again.
Now enter four zeros, the red light on the remote should blink twice.
Press the 'standby' button (top right).
If the TV turns off, then press 'select' and the light should blink twice again, job done.

If the TV does not turn off then press 'TV' followed by 'standby' again.
Alternate pressing 'TV' 'Standby' until the TV turns off.
When it does, finish by pressing 'Select.
Check the red light on the remote, if it blinks 3 times, then it has run out of options for 0000.

TO PROGRAM THE remote USING THE 3 DIGIT CODE:
1. Turn on the TV receiver
2. Press TV on the Sky Remote Control
3. Hold down SELECT and the RED buttons together for approximately two seconds, until the RED LED on the Sky remote blinks twice.
4. Enter three digit code from list for the receiver (early versions now flash twice).
5. Press select to enter code structure (the LED will flash twice if a valid code has been entered).
6. Now press the STDBY button and test other functions.
Repeat if necessary until a code is found that works most common functions.
TO PROGRAM THE remote USING THE 4 DIGIT CODE:
1. Turn your TV on.
2. Press tv on your Sky remote control.
3. Hold down select and the red button together for about two seconds, until the red light on the Sky remote control blinks twice.
4. Press tv on your Sky remote control again.
5. Key in the four digit code for your brand of TV. The light on the Sky remote control blinks twice. If the light blinks once only, recheck the code for your brand of TV and start again at Step 1.
6. Press the standby button on your Sky remote control. If your TV switches off, press select. The light on the Sky remote control blinks twice (code stored). If your TV does not switch off, press tv, then press the standby button. Repeat this (press tv, then standby) until your TV turns off, then press select (stores code).
If at this point the LED on the Sky remote control blinks three times then all possible codes for that make of receiver have been checked. Repeat from step one, ensuring that you enter the correct manufacturer code.
At the end of the sequence, if you see the TV Guide screen, the remote control setup process is complete. If you did not see the TV Guide screen, you must now complete the following steps.
8. Press tv on your Sky remote control.
9. Hold down select and the green button together for about two seconds, until the red light on the Sky remote control blinks twice.
10. Key in the number of the channel on your TV that you use for watching satellite TV.
11. Press select on your Sky remote control. The red light blinks twice. The remote control setup process is complete.
If after trying this, you still have problems, call your broadcaster's help desk. For your broadcaster's help desk number, select the Telephone Numbers option from the Services screen.

1. Turn your TV on.

2. Press tv on your Sky remote control.

3. Hold down select and the red button together for about two seconds, until the red light on the Sky remote control blinks twice.

4. Press tv on your Sky remote control again.

5. Key in the four digit code for your brand of TV. The light on the Sky remote control blinks twice. If the light blinks once only, recheck the code for your brand of TV and start again at Step 1.

6. Press the standby button on your Sky remote control. If your TV switches off, press select. The light on the Sky remote control blinks twice (code stored). If your TV does not switch off, press tv, then press the standby button. Repeat this (press tv, then standby) until your TV turns off, then press select (stores code).

If at this point the LED on the Sky remote control blinks three times then all possible codes for that make of receiver have been checked. Repeat from step one, ensuring that you enter the correct manufacturer code.

At the end of the sequence, if you see the TV Guide screen, the remote control setup process is complete. If you did not see the TV Guide screen, you must now complete the following steps.

8. Press tv on your Sky remote control.

9. Hold down select and the green button together for about two seconds, until the red light on the Sky remote control blinks twice.

10. Key in the number of the channel on your TV that you use for watching satellite TV.

11. Press select on your Sky remote control. The red light blinks twice. The remote control setup process is complete.