Trying to Save - Samsung UN40MU6300 - No Signs of Life

[KYBOSH]

Spi Flash (25Q40) and EEPROM (24C512) are completely different chips and their pinouts are also different, and this eeprom is installed in a different socket of the programmer, did you install it like that? Post a photo of how you installed this chip in the programmer and a photo of the programmer log software (screenshot).

That would probably explain it!
I placed it on the same track and told the program to AutoDetect but no joy.



I placed the 24C512 on the spot I had it before to illustrate where it was when I took the reading.
The log shows the read error I was getting.

[lotas]

You don't understand me at all, I wrote above that 25 series and 24 series are completely different types of memory, and why was the 25Q80 chip selected in the program when it should have been selected as 24C512?

[lotas]

And the chip must be soldered efficiently; on the right side, in my opinion, there is not even contact with the adapter.

[KYBOSH]

And the chip must be soldered efficiently; on the right side, in my opinion, there is not even contact with the adapter.

AGOLOGIES!
I knew you would misunderstand my last post.
The 24C512 was merely placed on the PBC to show how I had it connected before.
I removed it since then but wanted to show you how I had it on the board. It was not soldered at the time of the photo but was soldered when I tried to read it.

You don't understand me at all, I wrote above that 25 series and 24 series are completely different types of memory, and why was the 25Q80 chip selected in the program when it should have been selected as 24C512?

The screenshot shows the last chip I read before taking the photo. That chip was the 25Q80DV.
The program never saw the 24C512 at all. That's why it shows IC NOT RESPONDING on 2 previous attempts.

[KYBOSH]

Meaning to say when I connect the 24C512 to the reader... and hit AUTODETECT... the program does not see the chip at all.
The chip appears dead. Unless I have it connected incorrectly I wish to purchase a replacement and write the correct firmware to it.

[lotas]

This programmer cannot detect the chip automatically, you have to manually enter it...

[KYBOSH]

This programmer cannot detect the chip automatically, you have to manually enter it...

Thank you Sir!
I had no idea about this limitation in the software. I will manually enter them from now on!
Here is the file as well as the screenshot of the NeoProgrammer window.

[lotas]

Well, now it's a completely different matter, now it was correctly determined and calculated, here are two dumps for testing.

[KYBOSH]

Well, now it's a completely different matter, now it was correctly determined and calculated, here are two dumps for testing.

Amazing.
I will check this in about 1-2 hours when I get back to my workbench.
Here's a question though.... should I return W25Q40CL back to its original state or is the edited one you provided okay to leave on there?

[lotas]

Here's a question though.... should I return W25Q40CL back to its original state or is the edited one you provided okay to leave on there?

Your native dump 25Q40, which you posted in post 4, is not working properly (broken), I fixed it in post 5, so install it with status registers (0x88, 0x42).

[KYBOSH]

Your native dump 25Q40, which you posted in post 4, is not working properly (broken), I fixed it in post 5, so install it with status registers (0x88, 0x42).

Do i need to consider status registers for the 24C512 or is it write and go?

[lotas]

Do i need to consider status registers for the 24C512 or is it write and go?

The eeprom (24 series) does not have status registers.

[KYBOSH]

The eeprom (24 series) does not have status registers.

Thank you for the confirmation,
I checked the 2 dumps and still got no signs of life from the TV.
No red LED status lights or anything.
The main processor was slightly warm though.

I went back and redid the 25 series as well but still no joy.
I will check the board for fuses or anything else I can think of in a few minutes.

[KYBOSH]

I think I found something but Im still in the process to looking.
Im going through and checking all low and 0Ω resistors (they basically ask act as fuses) and all of them seem to be okay except R249.
It's right below the 25Q80DV (t-con?) chip and its rated for 3Ω but reading way above that in circuit.


The other 3Ω resistors I have checked seem to be okay.

Still looking though...

[KYBOSH]

Correction to my post above.
This is not a 3Ω resistor. Its actually a 3.3kΩ resistor.
I had to use my camera to zoom in and see the markings (332).
I guess Im getting old and my eyes arent what they used to be!
The resistor is still out of spec though and I will try to change it but I dont have 0805 sized SMDs on hand.

[KYBOSH]

I don't know guys... I think I might be cooked...

I started looking more around the board and found shorted caps near the main processor.
Maybe one is dead or maybe the chip itself is bad.

Then I started looking at IC1604 (the 25Q we originally fixed) and I saw 2 spots where it looks like the SMD diode or caps are missing circled in yellow.


It looks to me like a cap (C1607) was blown off somehow.



And Maybe the same case on the other side of the IC as well with C1607. Maybe maybe no on this is. Cant definitively say something was there before though it looks like it...



Now what are the chances that I knocked these off? Im almost 100% sure I did not do that!

[Diah]

nothings bad... you posted before Photo,, its look the same parts.. LOL

[KYBOSH]

nothings bad... you posted before Photo,, its look the same parts.. LOL

True but that was after i took the chip off.
Also it doesnt answer the question if the caps blows off before I even opened the TV up.

I have no good board to compare it.
And i didnt take a good quality pic of the board immediately after taking the heatsink off.
I could make an educated guess at what value cap is supposed to be there (based on other caps in the area) and see if it makes a difference at startup.

Not sure what to do ...

[lotas]

IC1604, IC1603.....

[KYBOSH]

IC1604, IC1603.....

You're a Godsend Lotas!
Do you have this TV or do you keep an archive of high resolution mainboard pics back there.
I knew something looked off....