Samsung UN65MU6500FXZA won't turn on

[nomoresonys]

Re: Samsung UN65MU6500FXZA won't turn on

Sure, try taping.

[Rebornchild]

Re: Samsung UN65MU6500FXZA won't turn on

I got a new board from ebay and upon connecting noticed that lights came on but no image disconnected the flex ribbon from the blue board that the tv panel is attached to and I hot most of screen on, could I use the tape method or what do I need to replace on that blue board?

[lotas]

Re: Samsung UN65MU6500FXZA won't turn on

You can try swapping the eeprom from your original board into the eBay board.

This is if the software version of SPI Flash and eMMC is the same.

[Storyteller12]

Re: Samsung UN65MU6500FXZA won't turn on

You can try swapping the eeprom from your original board into the eBay board. No standby light is 1 sign of bad eeprom on these “MU” series.

Unfortunately its a sign of bad power supply or bad mainboard also. lol.

But I have fixed a few of these with the same symptom by replacing that eeprom chip

[lotas]

Re: Samsung UN65MU6500FXZA won't turn on

Hopefully I can get an answer for this. I disconnected main board from power supply and backlight turns on, I also noticed that standby light works, I ordered a main board from ebay when I installed it there is no sign of standby light. Could this be a faulty board as well from ebay??

Yes.

[Rebornchild]

Re: Samsung UN65MU6500FXZA won't turn on

Hopefully I can get an answer for this. I disconnected main board from power supply and backlight turns on, I also noticed that standby light works, I ordered a main board from ebay when I installed it there is no sign of standby light. Could this be a faulty board as well from ebay??

[colt45lush]

Re: Samsung UN65MU6500FXZA won't turn on

What does the fail count voltage mean? The hair dryer maybe didn't get the chip hot enough as I wasn't directly targeting it. I will try hot air work station for heat.

[nomoresonys]

Re: Samsung UN65MU6500FXZA won't turn on

far out, let us know how it turns out.

[colt45lush]

Re: Samsung UN65MU6500FXZA won't turn on

Tried hair dryer already. So buy and try eeprom. If not throw it in a toaster oven 400f and see what happens because whatever.

[nomoresonys]

Re: Samsung UN65MU6500FXZA won't turn on

shop jimmy has eeprom available but you may have the usual bga failure from the main processor.

[nomoresonys]

Re: Samsung UN65MU6500FXZA won't turn on

try heating up the eeprom with a hairdryer, see if tv comes on if only for a while.

[colt45lush]

Re: Samsung UN65MU6500FXZA won't turn on

I ended up getting down to the panel boards 3 green 1 blue and disconnecting the u cable one at a time and no change in the back light or lcd picture. I don't think the tv is coming out of standby mode. The red led blinks about every 30sec but it flash responds when pushed in all directions. So assuming it's in standby mode I tested the connection to the power supply.

Ana dim 45mv
Od on off 3.397v
Blu pwm. 43.7mv
Power on off 3.366v
Fail count. 3.345v
All 13v. 12.72v

So main board? Eeprom? Is there a library of harvested eeproms?

Un65mu6500fxza fa01

[nomoresonys]

Re: Samsung UN65MU6500FXZA won't turn on

here's a good video on testing, I usually suspect a problem on the panel driver board/s, maybe a shorted/bad capacitor or other component, can follow those tests there to try to narrow down the problem, lots of good videos on there: https://www.youtube.com/watch?v=77tymvTJDxo

[colt45lush]

Re: Samsung UN65MU6500FXZA won't turn on

put pretty much any samsung un65 or un55 model in the search, there's a lot of info here about such.

Ok I didn't know to search outside of my specific model number. Un65 un55 are in the same samsung build style and diagnostics should be the similar. Got it will search some more. I'm lucky it's nice out and I am working on some mowers instead of smashing and breaking down the tv. Lol.

[nomoresonys]

Re: Samsung UN65MU6500FXZA won't turn on

it may take some investigation, can you post some good focused straight on pictures of each board and one of the whole back as to see how everything is connected? can use the go advanced for posting pics.

[nomoresonys]

Re: Samsung UN65MU6500FXZA won't turn on

put pretty much any samsung un65 or un55 model in the search, there's a lot of info here about such.

[colt45lush]

Re: Samsung UN65MU6500FXZA won't turn on

It's going to get the hammer and contractor bag trash treatment I guess. Shooting in the dark is not my style. I have not enough experience outside of led strip quick fixes to justify throwing money at something. There is only 2 topics that mentioned this model. Not a lot to go on

[colt45lush]

Re: Samsung UN65MU6500FXZA won't turn on

Also the main board heat sink is warm so is got to be processing something. Any ideas? I'll check back in the morning.

[colt45lush]

Re: Samsung UN65MU6500FXZA won't turn on

I just picked up this exact tv at the curb. Back light doesn't come on and screen doesn't show anything when I use my led tester to power the back light. Disconnecting the cable to the main board the back light powers on. The red led light on the bottom flashes in response to inputs from the select/power button but the optical port doesn't have a red light on inside it (is it supposed to?) Also detaching the ribbon cables from the main board connectors does nothing. Could a EPROM replacement fix my problem.

[JaredT]

Re: Samsung UN65MU6500FXZA won't turn on

BruceTV, you have perfectly described the issue I am having with a UN65MU6500FXZA. I plug it in and the backlight and TV come on for a few seconds, then powers off. If I unplug the mainboard, it stays powered on and lit up. I read this post and saw that I do have 1 Blue and 3 Green lower driver boards. I tested with just the blue one disconnected, and it stays on. I also tried with the blue one connected, and the other side U cable removed, and it stays on. This leaves me wondering if I have the same issue or not. The blue board is marked BN96-39042A.

Any help would be greatly appreciated.

We are seeing a lot of these coming in with a short in the lower driver board. It's tedious to go through the caps removing them one by one to find the short but it's doable. If your Tv backlights and optical on main board are turning on and off unplug the Tv and remove on ribbon cable going to the panel one at a time. If the backlights and optical stays on then the short is on that side you have disconnected. You have to remove the speaker and the lower driver board cover and test those itty bitty caps. Solder tweezers really come in handy for this job. You can also isolate it since each side has two bottom boards by disconnecting the U shaped ribbon. I am seeing most coming in with 3 green and one blue and the short was always on the blue. It's almost like Samsung had a "Houston, we have a problem here" and shoved a piece of crap board in there just to get by. It's marked BN96-39042A Once you unhook that oddball blue driver board the backlights and Tv stays on fine in most cases if it's not the Main board. Check two caps next to CK2 and CK3 on that blue board. We now save the lower driver boards on damaged panel tv's to get the good caps off them for future repairs. I also tell all my customers to avoid this model like the Covid19 virus because this is happening on 2 year old Samsung's and that's not worth the money SAMSUNG! Samsung engineering>