Samsung PN59D8000 Nothing After Move to Basement

[nomoresonys]

Re: Samsung PN59D8000 Nothing After Move to Basement

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[dick_barton]

Re: Samsung PN59D8000 Nothing After Move to Basement

Glad that you got there in the end. Happly viewing.

[deeMatrix]

Re: Samsung PN59D8000 Nothing After Move to Basement (Success)!

Hi dick_barton, Happy Thanksgiving. When I power set on PS_On goes from ~3.3v down to ~.2v and VS_On goes up to ~3.3v but quickly goes back down to 0v as though it was shut down or something (potentially by logic board)? BTW, I ordered the SMPS so we'll see what happens as had green blinking LED on logic board so figured start with the SPMS first. Can always return and get the logic board which is actually a lot less expensive if turns out that SMPS is not the issue.

So received and replaced the SMPS and TV is now fully functioning! Thanks dick_barton for your assistance and a big shout out to the community for a job well done!

[deeMatrix]

Re: Samsung PN59D8000 Nothing After Move to Basement

From another thread on this site.


It looks as though if the above is applicable to your set then the 3.3V from the logic board should stay high in order to maintain Va & Vs.
Have you checked that the logic board 3.3V output is not the problem?

Someone recently replaced their logic board and that brought up the supplies. I'll see if I can find the thread.

Edit
Here it is https://www.badcaps.net/forum/showth...ht=logic+board

Hi dick_barton, Happy Thanksgiving. When I power set on PS_On goes from ~3.3v down to ~.2v and VS_On goes up to ~3.3v but quickly goes back down to 0v as though it was shut down or something (potentially by logic board)? BTW, I ordered the SMPS so we'll see what happens as had green blinking LED on logic board so figured start with the SPMS first. Can always return and get the logic board which is actually a lot less expensive if turns out that SMPS is not the issue.

[dick_barton]

Re: Samsung PN59D8000 Nothing After Move to Basement

I then went and tested all the various voltages as rated on the various connectors which were spot on, except for the VA and VS which were very low and the VS_On which didn't register any voltage with logic board not connected. When the logic board was connected the VS_On goes up to 3.3V once powered on as it's suppose to but then quickly goes back down to 0V as though was shut down or something.

From another thread on this site.

3. If the PS_ON signal changes to Low, the Main SMPS supplies power to the Main Board and Logic Board, and Va and Vg power
is supplied to the DC-DC SMPS.
4. If the VS_ON signal from the Logic Board changes from Low to High, the Main SMPS supplies VS power to the X and Y Main
Board through the DC-DC SMPS, and the screen displays a picture on it.

It looks as though if the above is applicable to your set then the 3.3V from the logic board should stay high in order to maintain Va & Vs.
Have you checked that the logic board 3.3V output is not the problem?

Someone recently replaced their logic board and that brought up the supplies. I'll see if I can find the thread.

Edit
Here it is https://www.badcaps.net/forum/showth...ht=logic+board

[deeMatrix]

Re: Samsung PN59D8000 Nothing After Move to Basement

That level of humidity shoudn't be a problem.
As Diah says to stop working after being placed in storage for a few days is strange.
I have often repaired equipment which has been run for years and only every switched off into standby. After they have been powered down for a day or so for whatever reason, eg decorate the room or moving house they fail to power back up. This is more often due to electroytic capacitors failing.

This is interesting. In light of what you have seen is this often on the power supply board (SMPS in this case)? Another thread I saw on the site talked about a similar problem back in 2017 which turned out to be partially the SMPS, at least for the power up aspect so thinking ordering and replacing that may be worth a shot. Not sure if the logic board also makes sense but do get the 3.3v on VS_On initially which the logic board initiates and the green LED light so likely just start with the power board. Thoughts on this approach?

[dick_barton]

Re: Samsung PN59D8000 Nothing After Move to Basement

That level of humidity shoudn't be a problem.
As Diah says to stop working after being placed in storage for a few days is strange.
I have often repaired equipment which has been run for years and only every switched off into standby. After they have been powered down for a day or so for whatever reason, eg decorate the room or moving house they fail to power back up. This is more often due to electroytic capacitors failing.

[deeMatrix]

Re: Samsung PN59D8000 Nothing After Move to Basement

from the first photo it tell at which condition the Power boards, sockets got yellowish / dry then how about its soldering. i would suggest take out boards one after one and clean sockets / cable end to end and inspect the soldering .. i dont believe set will got defect if you moved it from work condition to basement unless the environment at the basement caused am issue.

Thanks Diah for your input. I will try your suggestions. As an FYI, the basement has a dehumidifier and roughly around 50rh most of the time although there were a few days when it went up to 60rh before we ever turned the set on.

[Diah]

Re: Samsung PN59D8000 Nothing After Move to Basement

from the first photo it tell at which condition the Power boards, sockets got yellowish / dry then how about its soldering. i would suggest take out boards one after one and clean sockets / cable end to end and inspect the soldering .. i dont believe set will got defect if you moved it from work condition to basement unless the environment at the basement caused am issue.

[dick_barton]

Re: Samsung PN59D8000 Nothing After Move to Basement

If you have carried out the power supply test as indicated in the trouble-shooting guide and the VA/VS voltages do not appear then quickly drop, it would appear to be a power supply problem.

If anyone else could offer their advice I'm sure it would be appreciated.

[deeMatrix]

Re: Samsung PN59D8000 Nothing After Move to Basement

Thanks. I have the Fast Track Manual and did the initial "Vital Signs" which didn't help much but didn't do the "Activating Power & Logic Board Test Patterns without Main Board" though yet so perhaps that might be next logical step to see if can rule something out.

dick_barton, first off I want to say thanks once again for all of your assistance. I did the above Fast Track Manual step and got nothing on display so basically the same.

Subsequently, I left the main power cable disconnected with the short "Power On to Circuit Ground on Power Connector" and also disconnected the logic board and Y-Main board so basically only had the SMPS powered on.

I then went and tested all the various voltages as rated on the various connectors which were spot on, except for the VA and VS which were very low and the VS_On which didn't register any voltage with logic board not connected. When the logic board was connected the VS_On goes up to 3.3V once powered on as it's suppose to but then quickly goes back down to 0V as though was shut down or something.

Not sure if all this leads to a possible bad SMPS because with nothing else connected to it VS and VA are nowhere near the 217V and 55V as rated? Or perhaps that's normal without the logic board connected as it can't send an active high signal to the SMPS to turn on VS so perhaps a logic board issue? But then not sure about VA being so low.

[deeMatrix]

Re: Samsung PN59D8000 Nothing After Move to Basement

Looking at another Xsus board the red circle appears to show a ground point so zero or near zero ohms would be correct.

Thanks. I have the Fast Track Manual and did the initial "Vital Signs" which didn't help much but didn't do the "Activating Power & Logic Board Test Patterns without Main Board" though yet so perhaps that might be next logical step to see if can rule something out.

[dick_barton]

Re: Samsung PN59D8000 Nothing After Move to Basement

I posted the pic of the TV back and the X-board marked with red arrow/circle indicating the one test point with only .6 Ohms resistance with power disconnected. Can post additional pictures as needed. Thanks once again for any potential insights.

Looking at another Xsus board the red circle appears to show a ground point so zero or near zero ohms would be correct.

[dick_barton]

Re: Samsung PN59D8000 Nothing After Move to Basement

I'm not sure what the reistance at that point should be. There should be a label on the back of the plasma panel with voltages given.

Maybe this pdf can help you.

[deeMatrix]

Re: Samsung PN59D8000 Nothing After Move to Basement

Without knowing what point the readings were low, it's not really possible to say if it's an issue.
Can you post some photo's?

I posted the pic of the TV back and the X-board marked with red arrow/circle indicating the one test point with only .6 Ohms resistance with power disconnected. Can post additional pictures as needed. Thanks once again for any potential insights.

[dick_barton]

Re: Samsung PN59D8000 Nothing After Move to Basement

Without knowing what point the readings were low, it's not really possible to say if it's an issue.
Can you post some photo's?

[deeMatrix]

Re: Samsung PN59D8000 Nothing After Move to Basement

It does appear that there is no problem but it wouldn't hurt to check at all possible points

So had the SMPS power, as well as Y-board and X-board power connectors disconnected and checked resistance at all the test points on the various boards.

All points registered various amounts of resistance except for one point on the X-board which was .6 Ohms (multimeter was set to 200 and display read 00.6. Any multimeter higher Ohms setting displayed 0.00). Not sure if this indicates something potentially wrong with the X-board or is .6 Ohms ok?

[dick_barton]

Re: Samsung PN59D8000 Nothing After Move to Basement

It does appear that there is no problem but it wouldn't hurt to check at all possible points

[deeMatrix]

Re: Samsung PN59D8000 Nothing After Move to Basement

Those readings appear to more than OK. Were these taken with all the wiring in place or did you just check VA and VS of the power supply board. If only for the power supply you will need to check them on the other boards they go to.

I had the power connection to the Y-board which connects to the X-board so all wiring was in place but only checked the VA and VS test points on the power supply board. I need to check additional locations on Y and X boards?

[dick_barton]

Re: Samsung PN59D8000 Nothing After Move to Basement

Those readings appear to more than OK. Were these taken with all the wiring in place or did you just check VA and VS of the power supply board. If only for the power supply you will need to check them on the other boards they go to.