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Samsumg Plasma 58" PN58B540 Shuts off    
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tony2706



Joined: 28 Dec 2013
Posts: 2
Location: Cypress, CA

PostPosted: Sat Dec 28, 2013 10:58 am    Post subject: Samsumg Plasma 58" PN58B540 Shuts off Reply with quote

Thanks in advance for the help. The Samsung Plasma 58" TV I have is shutting itself off. I diagnosed it to the on/off switch and infrared input to the main board. If I unplug this input the tv runs fine. Does anyone have some troubleshooting steps to isolate the problem? Thanks again
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JTS1957



Joined: 21 Jan 2009
Posts: 2343
Location: Far, Far Away

PostPosted: Sat Dec 28, 2013 11:33 am    Post subject: Reply with quote

Replace the board or the switches on the board, depending on your capabilities.
tony2706



Joined: 28 Dec 2013
Posts: 2
Location: Cypress, CA

PostPosted: Sun Dec 29, 2013 1:52 am    Post subject: Samsumg Plasma 58" PN58B540 Shuts off Reply with quote

Thanks for your input. Here is some more troubleshooting that I did today.

The noticed that there is an aluminum frame with conductive tape (at least that is what I think it is) that wraps underneath toward the plasma screen. The voltage is hard to determine with the DMM. It appears to be fluctuating. Is this normal to have a voltage on the tape? I have pictures but do not see a way to post it.

I have disconnected the button control module from the main board and it appears to be getting power from the tape mentioned aboce. I believe this is coming from the charge on the conductive tape since I do not see anywhere else that the button control module could be getting any power. As soon as I plug the assembly into the main board, the tv shuts down.

I would like to remove the button control board to get it away from the nearby voltage but it appears to be glued in. There was three dots of hot glue that I removed. Are there any tricks to remove the board without damaging it?

Any troubleshooting ideas would be greatly appreciated!
JTS1957



Joined: 21 Jan 2009
Posts: 2343
Location: Far, Far Away

PostPosted: Sun Dec 29, 2013 6:40 am    Post subject: Reply with quote

Most keyboard assemblies use multi conductor ribbon cable. A ground, a power source and one or more for signal.

If set works with remote when this cable is disconnected and you don't mind not having working keyboard buttons, this could be a possible solution. (Assumes that remote sensor doesn't become inoperative when cable is unplugged.)

As far as removing board - carefully.
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