Samsung UN46D6050TFXZA turns itself off 30 seconds after start

[MarkH8729]

The TV turns on fine. TV started turning off on its own about 30 seconds after I power it on a couple of days ago. Ran just fine about 5 hours before this started happening but had been off for those hours. Problem started the first time after that. I have turned it on from the remote and from the front panel and see no difference in behavior.

I have been able to turn it on multiple times and change channels and volume. The picture is good. The set just doesn't want to stay on.

Based on info I found online, I have tried a soft reset (unplugged the TV for as much as 5 minutes, tried this more than once), changed the power cord from a surge protector to the wall outlet directly, and, although I had never configured them or used them since I bought the TV (since 2011), I made sure eco solution, sleep time and anynet+ were all turned off, all without any change. I had to make those menu changes in multiple startups because of the limited on-time. The TV always cuts out at about 30 seconds after the power button has been pushed. And the remote works fine to operate a TV I borrowed while repairing this one.

Wanted to do a factory reset, but that option does not appear in my menus as suggested online.

I don't believe the firmware has ever been upgraded and now the TV won't stay on long enough to even attempt it.

Was able to find the service manual here: https://www.jabse.com/L1NhbXN1bmcvTE...Q2RDYwMDAucmFy

and a Fast Track Troubleshooting Manual here: https://archive.org/details/Samsung_...t_track_guide/

but neither explicitly address my issue, so I need some direction to get my TV working again. So, I believe I have good info available but as a novice it doesn't help me much. I don't see my issue addressed, but maybe someone can point it out to me. Never worked on a TV before but have had success with other appliances.

I have a Klein Tools MM1000 multi-meter but only have experience using it to check continuity in various scenarios such as repairing a lamp and also checking the voltage of a car battery. I also have a Weller SP23 23-Watt soldering iron, if that helps. Any and all guidance greatly appreciated.

Thanks, Mark

[Biruslapio]

Re: Samsung UN46D6050TFXZA turns itself off 30 seconds after start

Does it still have standby when it turns off? test all voltages coming out of the power supply while the TV is on and after it "shuts off".

[lotas]

Re: Samsung UN46D6050TFXZA turns itself off 30 seconds after start

The problem with this chassis and motherboard BN41-01587 (reboots every 30 sec.) is a problem with eMMC.

[MarkH8729]

Re: Samsung UN46D6050TFXZA turns itself off 30 seconds after start

Does it still have standby when it turns off? test all voltages coming out of the power supply while the TV is on and after it "shuts off".

Yes, the red standby light illuminates when the set "shuts off."

Is it okay to take the back cover off and leave the TV on the stand? Seems like that is what I would want to do to also be able to see the screen for testing purposes, such as the power supply, as you suggest. Just getting started on disassembly now...

[MarkH8729]

Re: Samsung UN46D6050TFXZA turns itself off 30 seconds after start

Okay, I'm really green when it comes to this. I took the stand and back cover off to reveal these images. I've attached some images as my first next step: back, main, ip board, & tcon(?). As the power cord attaches to the ip board, is that where the voltage readings want to come from? I don't know which component is more or less significant that the next...

[Biruslapio]

Re: Samsung UN46D6050TFXZA turns itself off 30 seconds after start

Since they said shut down, I assume it did not reboot.
If it is turning on and off in loop, it is as lotas said.

[MarkH8729]

Re: Samsung UN46D6050TFXZA turns itself off 30 seconds after start

No, it definitely turns off and that is it. It does not try to reboot/restart on its own.

[Biruslapio]

Re: Samsung UN46D6050TFXZA turns itself off 30 seconds after start

It may still be the memory corrupted, try starting the tv in service menu by press on the controller remote:
Mute + 1 + 8 + 2 + power on
Then doing a factory reset there, it should take 10 seconds at most.
This command has worked for all Samsungs I've tested.

[MarkH8729]

Re: Samsung UN46D6050TFXZA turns itself off 30 seconds after start

Okay, I've now started in Factory Mode multiple times. Finally, got the Option menu to load and selected Factory Reset. When I get to the Factory Reset button/page, nothing seems to happen when I select it or use the arrow keys on the remote. What more do I push to activate the reset process? OR How do I know that it has started/been run?

With the splash screen, it takes about 10 seconds to get the Factory Menu up. And maybe another 10 seconds to get through the Option Menu to the Factory Reset page. Then nothing happens and shut down after 10 more seconds.

Today I am getting better at navigating these menus which I don't recall being able to move through when I originally tried, and which led me to find these forums for help.

I've also attached an image of the SVC Menu which includes three items marked as "Failure". Not sure of their significance. I have always gotten my TV signal from a rooftop antenna. Also have a DVD player connected via the included AV Adapter and have watched various MP4s downloaded to a USB drive then attached to the TV.