Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

[KYBOSH]

Got another TV headed for the dumpster the other day.
Nice TV although it has those silly One Connect input boxes.

When TV is plugged into mains you see the backlights flash on amd off a few times then you get red error flashes at the status light. Backlights 'looks' uneven at startup but i have learned that looks are deceiving and they should be tested.

When i took the back off i unplugged the mainboard and the LEDs came on and stayed on. I then tested each led with my backlight tester and their voltages and amperages all read the same. So this eliminated the backlight as a possible culprit.

I then reconnected the mainboard and disconnected the 2 LVDS ribbon cables and plugged the TV back in. The reboot error returned. I then removed the harness to the WIFI card as well as the speaker leaving only the power/control button connected to the mainboard. Reboot error still remained.

This looks like a mainboard issue. I spot tested the MB for shorts on caps but didnt see anything jump out at me.

I dont know the history of this TV.
What indi know us that it has a small defect in the corner and im not sure if it would prevent the TV from showing a good picture (or any picture at all) if i am able to solve the issue with the mainboard.

At least if i get a picture i will be able to better guage the progress of my repair.

Please let me know what you guys think.
Pictures provided.

Thanks in advance!

[nomoresonys]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

Not positive but that looks like screen damage.

[KYBOSH]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

Not positive but that looks like screen damage.

Yes i dont recall seeing something like this before. Looks more like desalination than a crack. The real question is will it prevent a picture from displaying?

[EazyBone]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

Looks like screen damage and I would guess yes. Did you disconnect one ribbon at a time at the panel boards and not from main board? Part it out and sell the box/cable lol. They go for like 100-200 on ebay

[KYBOSH]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

I disconnected it at the mainboard... not the panel board. Why do you ask? Is there a difference?

Good idea regarding selling off the parts. The TV actually doesn't need the box to function like many other One Connect equipped models. It's there solely to accept HDMI and USB inputs.

[nubinator]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

I have same model and it also has weird panel damage without cracks. Mine are like black ink blotches around the screen. Even with screen off you can see the areas like its delaminated or something. and yes I sold off the one conect for a nice sum on ebay. Just turn off OCM Support in service menu before you do so you can still use the TV for apps otherwise youre stuck at one connect screen and have to reset eeprom

[Storyteller12]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

There are lcd panels and the liquid crystal has gone bad or leaked

[KYBOSH]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

Just turn off OCM Support in service menu before you do so you can still use the TV for apps otherwise youre stuck at one connect screen and have to reset eeprom

Thank you for this tip! I had not idea that was possible. Where can I find the procedure to do this?

[KYBOSH]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

There are lcd panels and the liquid crystal has gone bad or leaked

Thanks for the insight. This is caused by trauma at that spot correct? Too much pressure/weight at the corner like some when moving the TV and leaning the it on that corner? Or maybe from inserting a tool (thin screwdriver) to remove the back cover?

Trying to understand what 'may' have happened so I dont make a mistake like that. When I first turned on the TV to inspect it I dont recall seeing that spot but the backlight never stayed on for more than a second and it was on the floor so its possible i never noticed it.

Edit to add:

I recorded the TV's behavior as soon as I came across it and it already had the defect. So it wasnt my fault. Still like to know what might have caused this...

[Storyteller12]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

Honestly I’m not sure what causes it. Could be any of the things you mentioned. I know this particular model has issues sometimes with diode packs going bad on the buffer board of the panel. It might be getting hot or shorting out the panel as well causing this. But that’s just a guess

[nomoresonys]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

That's probably worth a shot, maybe test those diode packs or take off one test tv, no joy take off the other.

[KYBOSH]

Re: Samsung UN65KS8000 wont boot, restarts, display damage 💔 Worth a shot?

Can anyone post a picture of what a diode pack looks like on one of these TVs?
Thanks!

[csmith]

Need expert help on this one, Power light cycles on and off at 6 second intervals, when trying to power up backlights flicker dimly.
Unplug mainboard from power supply and backlights work. Ribbon connectors to panel removed same result. Changed mainboard,
no difference. Is Panel the issue and if so how to troubleshoot. Thanks in advance

[lotas]

. Ribbon connectors to panel removed same result. Changed mainboard,
no difference. Is Panel the issue and if so how to troubleshoot. Thanks in advance

This will not work, you need to first place a jumper on the motherboard between the FB_TRDY_1 and FB_TRDY_3 control points, then you can disconnect one LVDS cable at a time and determine which side you have the problem on.

[csmith]

Markings on board hard for me read , but I'll find them. Thank You lotas.

[lotas]

Markings on board hard for me read , but I'll find them. Thank You lotas.

Remove the black radiator and take a high-quality photo of this area.

[csmith]

Here you are, thank you.

[Diah]

you have broken socket the second one from top

[csmith]

Not a problem for I have a replacement mainboard, i just used this board for photo lotas asked for.

[lotas]

Here you are, thank you.

These dots need to be connected...