Samsung UE55MU6120KXXU, new main board, no picture.

[Braderz]

Re: Samsung UE55MU6120KXXU, new main board, no picture.

@dick_barton

So with the main board disconnected, the back lights don't come on.

With the main board connected, the back-lights still do not come on. Just a single blink of the standby light. I don't hear menu sounds or anything like before.

At the connecter I reported on earlier, with everything plugged in, at start up I get 380VDC and it slowly creeps downwards. After about a minute it only just falls to 250VDC.
In AC it fluctuates, and strangely it doesn't really differ from start up or even when the unit is off. The first 3 figures I get are 4 digit numbers which I guess are mVs, then I get 25~V, then 140V~189V. At this moment I just tested this again with boards unplugged and plugged in, and it seems as though it always slowly comes down. 189V looks like the most normal figure and that drops off a few volts each time it comes back around



I have posted a picture of the connector highlighted in your previous picture

[Braderz]

Re: Samsung UE55MU6120KXXU, new main board, no picture.

@Diah

I have uploaded a picture of the angle I am testing the pin at and a picture of my results also.

I may not be accurate in regards to knowing which pins are +1 +2 etc but here is what I think I found :

Between +2 & - 2 I have 10.5VDC~11.8VDC
Between +1 & - 1 I have 0

in fact, when testing down to chassis, only the one in the top left returns a voltage, which is 380 VDC at start up. The rest are 0.

[Braderz]

Re: Samsung UE55MU6120KXXU, new main board, no picture.

I think I'm gonna get a refund on the newer main board and trace the issue on the Power board or try a new one.

[dick_barton]

Re: Samsung UE55MU6120KXXU, new main board, no picture.

If you put your old board back in do the leds come on and stay on as in your earlier post?

[Braderz]

Re: Samsung UE55MU6120KXXU, new main board, no picture.

No, they're basically acting the same now

[Diah]

Re: Samsung UE55MU6120KXXU, new main board, no picture.

take the screen apart, you have one LED BL group open. always repair them when main boards disconnected.

[dick_barton]

Re: Samsung UE55MU6120KXXU, new main board, no picture.

I would tend to agree with Diah at this time.

[goldenphone]

Re: Samsung UE55MU6120KXXU, new main board, no picture.

Hello, I wanted to know if I could make a backup of the rom of that I need for one that I have here, thanks