Samsung 60" LED blank screen and WILL NOT STAY OFF

[nomoresonys]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

Funny a brand new strip is of such poor quality, time for a refund on that junk.

[x_orange90_x]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

I would just remove both plugs and connect them with wires, then make sure non of the connections touch the metal panel. Then also inspect the other connectors while it is apart.
It looks like they had poor solder connections between the plug and the strip, Then it started arcing and burnt the trace. So you might want to resolder ALL the strip plugs

Ok I'll do that then.

One of the light spreaders popped off when I was removing the strip. I don't have any super glue, but I do have Loctite SI 595 Clear RTV Silicone Adhesive... Would this work to reattach the spreader? The silicone is supposedly good up to 450°F.

[R_J]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

I would just remove both plugs and connect them with wires, then make sure non of the connections touch the metal panel. Then also inspect the other connectors while it is apart.
It looks like they had poor solder connections between the plug and the strip, Then it started arcing and burnt the trace. So you might want to resolder ALL the strip plugs

[x_orange90_x]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

You have bad contact resistance on the connector so it is heated up like that.

Can I repair this or does this strip need to be replaced?

Edit:

Trying to pull the strips back to place something anti-cunductive resulted in the connector falling apart.

Checked eBay and someone wants nearly $20 for a single used strip. So, could I remove the connector and solder wires between the connection points?

[budm]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

You have bad contact resistance on the connector so it is heated up like that.

[x_orange90_x]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

I think these pictures are self explanatory...

[x_orange90_x]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

With that burn smell going on, I'm thinking the problem should be visible maybe.

That's what I'm hoping for. It seemed to be originating from near the bottom center, which it where the strips connect. Perhaps the connector it's arcing on the frame when voltage is applied?

So in the likelihood it's something I can easily repair, what should my expectations as far as life expectancy? I never used them at full brightness, but whatever is happening now makes me fear that their life span has been dramatically decreased.

[nomoresonys]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

With that burn smell going on, I'm thinking the problem should be visible maybe.

[nomoresonys]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

Ok, looks like you need to get in there again, wonder if this is one of those models where a problem on the powerboard keeps messing up the backlights or if you have just a backlight short, bare wire, or some such.

[x_orange90_x]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

overall behavior first.... trying to find a "normal" position (ie. vertical position) where the tv operates properly... then once there you can start checking things to form a baseline along with possibly understanding what the difference is from "proper upright position"... basically, it costs nothing to do the "flips"... and proceed from there carefullly especially with the meters that you have. :-)

Tried all different orientations and no change. However, I believe I found where the problem resides, and that is the backlights. While they were on and flashing, I started smelling hot electronics. I smelled around all of the boards and nothing. The smell was coming through the vent hole in the attached picture.

Edit:
I'm preparing myself to open up the panel for the third time.. But I have a few questions for. If an LED itself is shorted, in this particular TV, would the rest of the lights be working and that one would be off, or would it still be on? If it's shorted, can it be desoldered and replaced (I have the original set still)? And finally, if it's a short at the connector between strips, can that be repaired (ie. Electrical tape behind it)?

I'm not up for purchasing a whole new set again as these are out of warranty now.

[budwich]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

overall behavior first.... trying to find a "normal" position (ie. vertical position) where the tv operates properly... then once there you can start checking things to form a baseline along with possibly understanding what the difference is from "proper upright position"... basically, it costs nothing to do the "flips"... and proceed from there carefullly especially with the meters that you have. :-)

[x_orange90_x]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

See if things change.

In regards to resistance on the wires, or in overall behavior?

[budwich]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

you might try further "panel orientation" tests. How about flipping the panel "upside down"... ie. top down, bottom up. Then also try side up / side down. See if things change.

[x_orange90_x]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

Shorted out LED in the series connected LED's will still allow the LED strings to light up, open LED will cause the whole LED not to light up. Too many shorted out LED will also cause the LED circuit shutdown. Shorted circuit in one of the LED string to the chassis will also cause the shutdown.
What kind of the LED strips/assemblies are used in your TV.
I run into panels that have one of the LED strip's wire nicked by the chassis and cause intermittent shorts circuits to the chassis.
BTW, do you have LED tester?

Here is the link to exactly what I purchased from Shopjimmy:

https://www.shopjimmy.com/samsung-bn...-12-strips.htm

So under normal, wall mounted use, what would cause an led to short circuit? When I installed the strips I used strong double sided tape to secure them to the chassis.

Also, if an led is shorted, would it be off or would it still light up? I see no darkspots when the screen is lit and blank.

[R_J]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

The Samsung I had for service was actually a 40" a UN40H5203 (mfg. 2014). When I first got it, It appeared dead. After a few checks I unplugged the leds and the tv turned on.
This was the only time I had seen a led string shorted to the chassis. Lifting the led string off the chassis restored the voltage but still no light. One led was all black around it. but after checking the led strings I found most of the led's on the 3 strings were bad. This was common for this model.
The reason I mentioned this was because I read this

TV face down, power on, I reconnected the backlights.. Raised the set to a 30° angle and watched for about 10 seconds and it was working perfectly. Raised it upright to 45° and it went haywire again

[budm]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

Shorted out LED in the series connected LED's will still allow the LED strings to light up, open LED will cause the whole LED not to light up. Too many shorted out LED will also cause the LED circuit shutdown. Shorted circuit in one of the LED string to the chassis will also cause the shutdown.
What kind of the LED strips/assemblies are used in your TV.
I run into panels that have one of the LED strip's wire nicked by the chassis and cause intermittent shorts circuits to the chassis.
BTW, do you have LED tester?

[x_orange90_x]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

I had a 32" samsung with bad led's and one of the led's was shorted to the aluminum strip, so it was actually killing the led voltage. If I lifted the strip off the metal panel, the aluminum strip had the full led voltage on it.

Was that a much older model by chance? I know that the way the LEDs are configured in my model wouldn't allow for a a single burnt out LED. The entire set of LEDs would remain off.

I understand that manufacturing practices often produce short-lived and defective products, but these strips are only ~14mo old and I used them at only 7/10 backlight.

Have any of you experienced poor quality and/or life from Shopjimmy's backlights? My only issue this far was with the previous set in which the spreaders started falling off.

[R_J]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

I had a 32" samsung with bad led's and one of the led's was shorted to the aluminum strip, so it was actually killing the led voltage. If I lifted the strip off the metal panel, the aluminum strip had the full led voltage on it.

[x_orange90_x]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

So at this point, are you still getting the same reaction?

I tried to reproduce this and couldn't. Checking resistance again and applying pressure on the chassis didn't reveal anything new either.

[budm]

Re: Samsung 60" LED blank screen and WILL NOT STAY OFF

I just attempted that and the very first pin I touched blew the multimeter (fuse?). The TV is fine however. I undoubtedly believe at this point that there is a short occurring somewhere within one of the LED strips. TV face down, power on, I reconnected the backlights.. Raised the set to a 30° angle and watched for about 10 seconds and it was working perfectly. Raised it upright to 45° and it went haywire again. This makes me think that one of the connections between LED strips is somehow arcing on the chassis.

So at this point, are you still getting the same reaction?