Trying to Save - Samsung UN40MU6300 - No Signs of Life

[KYBOSH]

Im circling back around to this one about to order an assortment book of SMDs to fix my fumbling.
I grab my calipers to verify and frightened to see that I need to order 0402s

I have never dealt with SMDs that small before.... But Im going to give it a shot!
I dont think the pads will accommodate a 0603.

[KYBOSH]

The photos remain in the archive. The upper capacitor has a power supply of 3.3v (blocking), you can set it to 0.01 -0.1 mF, but you need to know the lower one, since it is gray, it is more likely to be pF....

But your upper capacitor was not blown away by the station, but knocked down, since the remains were left on the seats, before you it (TV) was already repaired or tried to be repaired, it looks like when they installed a clothespin from the programmer (without desoldering the chip itself) to read, write dump , and the capacitors were damaged...

You are an absolute genious Sir for figuring this out.
After reading this post i realize that i am indeed im the guilty culprit.
i was using the clothespin connector to read the chip early on. The connector is a cheap one that came with the programmer and it was losing the ability to grip and stay on the chip. The plastic on the end was wearing out so quickly. I struggled may times to get it to attach to the chip in a secure way and be able to read it. In the end i tossed the connector and started removing the chip with hot air. I must have damaged the board messing with the connector. Thise caps are so small i could not have known that i ran the risk of damaging them.

i only have 1206 sized caps on hand at the momentum. I may have to order a book of smalller SMDs for this job. Thank you very much for the assist and guidance with this. Very happy to have learned so much. I will be twice as careful next time!

[lotas]

The photos remain in the archive. The upper capacitor has a power supply of 3.3v (blocking), you can set it to 0.01 -0.1 mF, but you need to know the lower one, since it is gray, it is more likely to be pF....

But your upper capacitor was not blown away by the station, but knocked down, since the remains were left on the seats, before you it (TV) was already repaired or tried to be repaired, it looks like when they installed a clothespin from the programmer (without desoldering the chip itself) to read, write dump , and the capacitors were damaged...

[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....

[lotas]

IC1604, IC1603.....

[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 ...

[Diah]

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

[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!

[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 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]

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.

[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]

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]

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]

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]

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

[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]

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

[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.

[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.