Samsung UEMU6199U - no Standby - bad Firmware?

[Mirenia]

Hi everyone,
I've got a Samsung UEMU6199U which has no Standby LED and no reaction if try turning it on.
Voltages on the power supply board is okay. Backlight test is also okay.

I read about a corrupt firmware on IC1604 on some models, did a dump of this IC and turns out: First sectors are empty.
So I think my TV has exactly this issue.

Can someone please fix the dump?

And how do you do that?

As I understand you fill in the empty sectors and leave the rest as it is. But where do you get the "information" of what you should put in the empty sectors?
I searched the whole internet for a firmware file for my exact model, but didn't find anything (besides of dumps on pay-websites)
I want to help other people on the platform here, too So that's why I'm asking

Technical data:

• Model: UEMU6199U(XZG)
• Board: BN41-02568B
• IC1604: Winbond 25Q40

Thanks a lot in advantage!

[lotas]

Try it, don't forget to set and write the status register (0x88, 0x42) after writing a correct dump.

[Mirenia]

In the meantime I tried to fix the firmware myself. Found a working bin here in the forum from a UEMU61200 and copy/pasted the missing bits to my dump-file.

Could maybe one have a look at it, if I did it right?


(Cannot flash the file back to the IC, because I only have a EZP2019+ programmer, which is unable to set status register. But CH341 is already ordered and arrives in a few days)

[Mirenia]

Try it, don't forget to set and write the status register (0x88, 0x42) after writing a correct dump.

Oh sorry! Didn't wanted to ignore you. Took a while to write my comment. I'll check that out. Thank you a lot!!!!


EDIT: And it looks similar to my own fix!

[lotas]

In the meantime I tried to fix the firmware myself. Found a working bin here in the forum from a UEMU61200 and copy/pasted the missing bits to my dump-file.

Could maybe one have a look at it, if I did it right?


(Cannot flash the file back to the IC, because I only have a EZP2019+ programmer, which is unable to set status register. But CH341 is already ordered and arrives in a few days)

Yes, you did it right, the model and size of the panel are not important here, the software version is important here, with each software update, the data also changes in 25Q40, the software number should be the same in eMMC and in SPI Flash (25Q40).

[Mirenia]

Okay, so that means as an alternative I simple could've read the dump from eMMC and take that as my copy-source?
Learned something new today - thank you!

[lotas]

Dump eMMC weighs 8 GB, and dump spi flash 512 kB. I wrote about the software version number, which is updated via the Internet or USB, and this software number must match.
If the version number does not match, the TV will show a standby indicator, but the TV itself will not be able to turn on.

[Mirenia]

Okay got it with the version numbe

Just one more (maybe stupid) question:

Is there some kind of editor or viewer which decodes samsung TV firmwares?
Actually I did everything "blind" with a standard hex editor.

[lotas]

Yes, I also do it through the HEX editor, but I already have all the blanks (all versions) and I just look at the beginning of the broken dump, and I already know which "header" to insert...

[Mirenia]

It worked! TV is TVing again.
Thanks very much for your help and explanations!

(Unfortunately I somehow broke the panel... was very careful and layed it down on a soft towel. The panel is cracked across the entire screen. Maybe some stress/tension crack while I layed it down...)

[lotas]

It must be placed on a flat, hard surface...

[Mirenia]

The surface was flat and it was no thick towel.
Thin like a kitchen towel but as big as the TV.

So I am wondering... but maybe that happened some time before.
the TV was stored for over a year because I never figured out what was wrong until I saw the thread regarding the firmware