Samsung #PN51D450A2DXZA N411 Black screen, no power?

[cprime]

so i wake up this morning to turn on the tv and i get this surprise. When i turn on the tv the red led light blinks 1 time and the screen flashes once( grey looking) and then immediately goes black. I also hear a clicking noise in the process. The red led stays on constantly ( i assume that means no power). I have read alot about other problems where the led will blink 5 times or so but this is not the case with mine. I took the back panel off and had a look at the boards. I didnt see any indication of bad capacitors but i notice that the green led on the Logic board blinks continuously. Should i try to replace the board with the power supply first? Any ideas at all?

[tom66]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

Can you try this test on your control board? Since it's blinking continuously it might confirm a main board fault.
https://www.badcaps.net/forum/showpo...61&postcount=2

[cprime]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

Can you try this test on your control board? Since it's blinking continuously it might confirm a main board fault.
https://www.badcaps.net/forum/showpo...61&postcount=2

one thing to note about the blinking. When i initially took the back panel off, the green led would only blink once and go off when we tried to power up the tv. Well, we changed the batteries in the remote and tried to turn the tv on again and that is when the LED would start blinking continusly. Not sure if its coincidence or not but thats what happened.

[cprime]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

I'm not sure i understand the test. What is suppose to happen? If i do the steps will the tv come on? or will the LED not blink? not sure

[tom66]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

When you do the test, if the main board is faulty, the TV will power on and a sequence of display test patterns will appear on the screen.

[cprime]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

ok, i'm doing the test now, what is happening is the screen is showing different colors (one at a time) and other tests( like a red screen with it fading to black). The green LED is blinking continusly on the Logic board. How long am i to let this happen? will it stop on its on? what now?

[tom66]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

This confirms the main A/V board is bad, unplug the TV for now and order a new board or get old one repaired.
Main A/V has HDMI ports, etc. on it.

[cprime]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

Tom66, you are the man!!! Thanks a bunch! I'll just order a new board. I'll google a retailer to buy from unless you can suggest a site? Anyway, to replace the main board, is it just a matter of unscrewing the old one, disconnecting and reconnecting the new one and turning on the tv?

[tom66]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

ShopJimmy is a good supplier.
Order by the LJ9x-######Z part number, not LJ4x-######Z part number.
It is a good idea to match the suffix [A-Z] but that is not always possible.

[cprime]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

ShopJimmy is a good supplier.
Order by the LJ9x-######Z part number, not LJ4x-######Z part number.
It is a good idea to match the suffix [A-Z] but that is not always possible.

Thanks on the supplier, but you lost me on the how to order. I just put the model # and version of the tv in the search bar and it brought me here.

http://www.shopjimmy.com/catalogsear...450A2DXZA+N411


then i looked for the main board. http://www.shopjimmy.com/samsung-bn9...d450a2dxza.htm

I assume this is correct?

[tom66]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

Ah, looks like your set uses BN part numbers.
So check that the sticker is marked BN96-19471A matches what is printed on your board. If so that should work fine.

[cprime]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

i did a double check and it matches perfectly! Again, thanks for helping me. You probably saved me alot of money!

[cprime]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

Update: The new mainboard arrived and i replaced the old one. Tv came right on and is now working again!! Thanks!

[tom66]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

Great to hear, thanks for the repair feedback, enjoy your TV.

[rdelgado]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

so i wake up this morning to turn on the tv and i get this surprise. When i turn on the tv the red led light blinks 1 time and the screen flashes once( grey looking) and then immediately goes black. I also hear a clicking noise in the process. The red led stays on constantly ( i assume that means no power). I have read alot about other problems where the led will blink 5 times or so but this is not the case with mine. I took the back panel off and had a look at the boards. I didnt see any indication of bad capacitors but i notice that the green led on the Logic board blinks continuously. Should i try to replace the board with the power supply first? Any ideas at all?

Hello Tomm66 I have the same problem, I have tried the test you recommended but I was not so lucky, TV still black, just get a quick flash then black and green led on the board is blinking, any suggestion you may have ? same model of TV

[techno102]

Re: Samsung #PN51D450A2DXZA N411 Black screen, no power?

Hello, I congratulate the order and delivery service, I would like help because I install the power module you sent me and I have the same problem relay that clicks all the time. I did the test on the jumper pin 3-4 control board and disconnect the LVDS cable. result tv on relay click always but it becomes white in full a split second and disappears, it is done a repetition. What do you think? Thank you for your help.