Samsung UN46D7000 46'' LED; No Power

[budm]

Re: Samsung UN46D7000 46'' LED; No Power

That must be your body resistance. so OL on all 16-pin of both female connectors? We want to absolutely sure in case you need to get the new board at this point.

[beedoola]

Re: Samsung UN46D7000 46'' LED; No Power

yeah, OL on both female connectors.

So should Pins 1 and 2 on the ONL802B connector be getting 176v as the PCB legend states for the LED output? Do you know where the voltage would get kicked up to that amount? I test the surround area where those 4 electro caps are and keep getting 107v as the highest voltage I can find.

[budm]

Re: Samsung UN46D7000 46'' LED; No Power

I have not look real close at the bottom side of the board to see how they drive the LED strings yet.

[budm]

Re: Samsung UN46D7000 46'' LED; No Power

It looks like the pins on those two connectors are linked but the picture is not shown. Can I see the picture that clearly show the traces between the two connectors?
It also looks like the LED are edge lit from the left and the right side of the panel based on the labels of the pin as L1+ L1- (L1~L8), R1+ and R1- (R1~R8).
At this I may not be able to troubleshoot it down to component level.

[beedoola]

Re: Samsung UN46D7000 46'' LED; No Power

Some pins on the same side - even numbered or odd numbered, are linked. The following are linked:

802A Pins:

14/16
4/6
3/5
13/15

802B Pins:

3/5
13/15
4/6
14/16

Are there any other tests I can do to totally confirm it is the PS board thats bad?

[budm]

Re: Samsung UN46D7000 46'' LED; No Power

At this point, not much. we know that the LED power supply is not putting out the correct voltage as printed on the board. I do not know what else you can do to be 100% sure.

[beedoola]

Re: Samsung UN46D7000 46'' LED; No Power

would the lack of voltage to the LED cause a total non-power up? I had experienced it not turning on but some time later I came back in the room and there was sound but no picture. The guy I got it from said it works sometimes but often not, so if it works sometimes its not a total dead part thats causing it but something intermittent? I checked the electro caps and they all seem ok so I'm kinda stumped

[budm]

Re: Samsung UN46D7000 46'' LED; No Power

That is another problem, backlights are just for the light source. You can lose the lights source but the main board should still function with sound, etc. you just cannot see the pictures since there are no light sources.
How old is this TV? It does not sound like it is a reliable TV.

[beedoola]

Re: Samsung UN46D7000 46'' LED; No Power

That is another problem, backlights are just for the light source. You can lose the lights source but the main board should still function with sound, etc. you just cannot see the pictures since there are no light sources.
How old is this TV? It does not sound like it is a reliable TV.

probably 2 years- its a 3D tv and has an USB 3 port on it (not sure when they were introduced) probably 2011 is when the TV was made.

The no picture but sound incident happened once and briefly.

Also; when I touch any of the panel buttons the front LED flashes rapidly.... Is that an indicator that the its a problem with the buttons?

[budm]

Re: Samsung UN46D7000 46'' LED; No Power

I do not think so.

[beedoola]

Re: Samsung UN46D7000 46'' LED; No Power

hmm. Well is replacing the PS board my best bet?

[budm]

Re: Samsung UN46D7000 46'' LED; No Power

I just have a feeling you have more than one problem.

[tom66]

Re: Samsung UN46D7000 46'' LED; No Power

D7000 is an early-mid 2011 model.
Samsung LED TV quality seems quite dodgy, lots of issues!

[beedoola]

Re: Samsung UN46D7000 46'' LED; No Power

I just have a feeling you have more than one problem.

why is that? Because the it works sometimes? Or because I mentioned how the sound came on momentarily and then the TV shut off?

[randtek]

Re: Samsung UN46D7000 46'' LED; No Power

hmm. Well is replacing the PS board my best bet?

In my opinion, yes. Many times in electronics, it is not possible to definitively rule out a given part by measurements. Sometimes you just have to go with your gut instinct, and order the part you think is bad.

[beedoola]

Re: Samsung UN46D7000 46'' LED; No Power

UPDATE.

Got the new PS board today: Tv still does not work : /

If I unplug the connection to the Logic board and plug the wall plug in, I get the LED backlit so the old PS board was problematic.

Is there a reset or something I might be missing that is causing this not to work?

I got the same model PS board from River Valley Electronics - as was linked on the first page of this thread.

Thanks.

[budm]

Re: Samsung UN46D7000 46'' LED; No Power

You can try MUTE, 1, 8 , 2 to reset. I have a feeling you also have main board problem as in post 28 & 32.

[beedoola]

Re: Samsung UN46D7000 46'' LED; No Power

Actually it came on and works. I took the outer rim off the rear and reset some cables - not sure if that fixed it. If it did, that may worry me. Perhaps I needed to plug in just the PS board with the logic board first?

Are these TVS - LED, poorly vented? I watched tv for about 30-40 min and the rear left where the PS board is was a little warm. Nothing extreme - like hot to the touch, but I'm just wondering if they are supposed to get a little warm.

[tom66]

Re: Samsung UN46D7000 46'' LED; No Power

The LEDs have very little cooling and are quite heat sensitive.

[beedoola]

Re: Samsung UN46D7000 46'' LED; No Power

will a fan behind the tv help?