Un55mu630df

[fcisolutions]

Hello I have a Samsung UN55MU630DF television. I have tested the power supply and getting good reading on my voltages. 12.2 and 3.34. I replaced the main board because initially it would not even come on. Now the back lights flash on and off in a cycle. No T-Con but did replace ribbons from main to panel.

[nomoresonys]

Re: Un55mu630df

Can you throw up some good clear pics?

[fcisolutions]

Re: Un55mu630df

Here are some pictures of the boards.

[dick_barton]

Re: Un55mu630df

Can you give the voltage readings on the 12 way connector CNM803 (blurry so hard to read) and the legend name alongside it.

[fcisolutions]

Re: Un55mu630df

CNM803

Pin 1 - .01V
Pin 2 - 3.21V
Pin 3 - 12.67V
Pin 4 - 3.47V
Pin 5 - 12.67V
Pin 6 - 3.15V
Pin 7 - 12.67V
Pin 8 - 4.41V
Pin 9 - 12.67V
Pin 10 - .01V
Pin 11 - .01V
Pin 12 - .01V

[budm]

Re: Un55mu630df

Can we please get the name of each pin?

[dick_barton]

Re: Un55mu630df

Without the legend corresponding to the pin numbers the readings are not much use.

[fcisolutions]

Re: Un55mu630df

This is what I got.

[budm]

Re: Un55mu630df

So ALL the control signals are all stable while the Backlights are flashing?

[CapLeaker]

Re: Un55mu630df

What happens if you unplug the main board from the PSU, then plug the TV in? Back lights should turn on and stay on.

[nomoresonys]

Re: Un55mu630df

http://www.shopjimmy.com/samsung-bn4...-led-board.htm picture if thats it.

[fcisolutions]

Re: Un55mu630df

Yes if I unplug the main board from PSU backlights come on and stay on.

[nomoresonys]

Re: Un55mu630df

CNM803

Pin 1 - .01V
Pin 2 - 3.21V
Pin 3 - 12.67V
Pin 4 - 3.47V
Pin 5 - 12.67V
Pin 6 - 3.15V
Pin 7 - 12.67V
Pin 8 - 4.41V
Pin 9 - 12.67V
Pin 10 - .01V
Pin 11 - .01V
Pin 12 - .01V

Try these readings again, need them with tv plugged in and then with power switch activated, see if any change value when you hit power button, report findings.

[joecop67]

Re: Un55mu630df

What's going on? I can't start a thread? I don't have permission to check my own stats.

[joecop67]

Re: Un55mu630df

It says I have 1 post, but I've made hundreds of the years.

[Malachi]

Re: Un55mu630df

What's going on? I can't start a thread? I don't have permission to check my own stats.

Never mind. Wrong username for this forum. It's Malachi here. Lol

Delete.

[nomoresonys]

Re: Un55mu630df

Yes if I unplug the main board from PSU backlights come on and stay on.

.

[nomoresonys]

Re: Un55mu630df

Looks and acts like mainboard but seeing how bad these samasungs are, I think it's the powersupply.

[nomoresonys]

Re: Un55mu630df

Check all your diodes and resistors.

[budm]

Re: Un55mu630df

Yes if I unplug the main board from PSU backlights come on and stay on.

If the backlights come on and stay on without flickering then your power supply board, LED driver and LEDs are OK.
But as I asked in post #9, are your sure that the control Voltages (not the A13V) are stable?