Samsung "MU" series (UN, UA, UExxMUxxxx) fault dump IC1604 25Q40...

[lotas]

How many times does the standby LED blink between pauses?

[Mr.Pc]

How many times does the standby LED blink between pauses?

It blinks non-stop, without pause, there is no error code. Measuring the voltage on the main PCB connector, the power supply oscillates between 11.5v and 9v. I did the test without the 25q40 and the voltage stabilizes at 9.5v. When I disconnect the power supply cable, the panel LEDs light up normally and the source voltage stabilizes at 12.65v.
I did the test with a bench source too, I injected 12v into the main PCB and there is very low consumption and it goes back to zero, this keeps looping

[lotas]

What model, panel number, I want to check 25Q80 if I find a dump, and what is the motherboard number BN94-xxxxx?, it is written on a paper sticker on the motherboard.

[Mr.Pc]

What model, panel number, I want to check 25Q80 if I find a dump, and what is the motherboard number BN94-xxxxx?, it is written on a paper sticker on the motherboard.

What is written on the paper is BN94-12811S. Model: BN41-02568 - Code: BN41-02568B is printed on the motherboard. If you want I can take a photo of everything

[lotas]

What is written on the paper is BN94-12811S. Model: BN41-02568 - Code: BN41-02568B is printed on the motherboard. If you want I can take a photo of everything

What is the panel number? CY-GK065HGNVBH ?

[Mr.Pc]

What is the panel number? CY-GK065HGNVBH ?

Hello Lotas! Sorry for the delay, but it was due to the time. I picked up the TV again and saw the panel number: CY-GK065HGNV5G

[lotas]

Everything is fine with 25Q80 too, you can read dump 25Q40 again and show what its status registers are.

[Mr.Pc]

Everything is fine with 25Q80 too, you can read dump 25Q40 again and show what its status registers are.

I can yes! Just to let you know that since I read them the defect is the same. These are the same ones I already sent you, but if you want I can read them again and send them, but as I already told you the problem has been the same since then.

[lotas]

I can yes! Just to let you know that since I read them the defect is the same. These are the same ones I already sent you, but if you want I can read them again and send them, but as I already told you the problem has been the same since then.

You don't understand me, I don't need dumps, but what status register is registered on 25Q40, which is what the programmer log shows when reading these statuses.

[Mr.Pc]

You don't understand me, I don't need dumps, but what status register is registered on 25Q40, which is what the programmer log shows when reading these statuses.

hmmm now I understand Lotas! About this error log issue, I don't know how to check. The TV's standby LED blinks continuously and does not report any code. To extract the file I use the TL866 II and I don't know how to see this error log with this equipment. 😅☹

[lotas]

hmmm now I understand Lotas! About this error log issue, I don't know how to check. The TV's standby LED blinks continuously and does not report any code. To extract the file I use the TL866 II and I don't know how to see this error log with this equipment. 😅☹

Yes, this is not an error log, but a protection (status register), read the 25Q40 chip again and after reading, click on “status register” and a new window will pop up, this window show me where the checkboxes are...

[Mr.Pc]

Yes, this is not an error log, but a protection (status register), read the 25Q40 chip again and after reading, click on “status register” and a new window will pop up, this window show me where the checkboxes are...

Ok! I will make this now. Wait a minute.

[Mr.Pc]

Yes, this is not an error log, but a protection (status register), read the 25Q40 chip again and after reading, click on “status register” and a new window will pop up, this window show me where the checkboxes are...

Pronto!

[lotas]

Pronto!

Everything is correct, as it should be.

[lotas]

So with 25Q40 and 25Q80 you have everything in order, all that remains is eeprom 24C512, dc/dc converters on the motherboard (the correct ones output voltages), underestimated or short circuit on the supply lines or the processor itself....

[Mr.Pc]

So with 25Q40 and 25Q80 you have everything in order, all that remains is eeprom 24C512, dc/dc converters on the motherboard (the correct ones output voltages), underestimated or short circuit on the supply lines or the processor itself....

Right! Can you verify 24512? I understand very little about programming and I'm even curious to understand it better, but as I said, if you can see it for me, I can read it and put it here. Regarding shorts, I didn't find any and the dc/dc ldo regulators I can't check the outputs because the board goes into protection and also doesn't have their reference so I can inject voltage and do the tests. Anyway, I'm still grateful.

[lotas]

24C512 I can't check, since they are all different for each TV (it contains the model, settings, serial numbers, MAC Address, ....), I can upload a working dump for checking, just be sure to save your own one.
Have you checked the wi-fi module or turned it off?

Try.

[Mr.Pc]

24C512 I can't check, since they are all different for each TV (it contains the model, settings, serial numbers, MAC Address, ....), I can upload a working dump for checking, just be sure to save your own one.
Have you checked the wi-fi module or turned it off?

Try.

Hi Lotas! I've already turned off the Wi-Fi module too, but it stays the same, unless this card only works with the module connected, but I don't think so. I have the board here on the bench, I connected 13v and checked that even the 5v voltage is stable, below it everything fluctuates. I looked for the 25C512 but I didn't find it, I only found a 25512FD but I'm sure it's another component because on the board it has terminals 1 to 4 on the same track, so it can't be 25C512. Finally my head is starting to smoke and I'm already wanting to set everything on fire hahaha I think I'll try to look at another board because I don't have an oscilloscope to be able to see the circuit in another way, I also don't want to take up as much of your time as I already did . Thank you once again for all your support and patience.

[lotas]

Maybe it's still 24512FD, if so, then it's 24C512 and on the board 1-4 pins are connected together and sit on the ground.
You write that your 5v is stable, but below is not stable, while 3.3v is doing well, they should also be stable, since this voltage powers the standby and the spi flash 25Q40 (8pin) should be stable at 3.3v.

[Mr.Pc]

Maybe it's still 24512FD, if so, then it's 24C512 and on the board 1-4 pins are connected together and sit on the ground.
You write that your 5v is stable, but below is not stable, while 3.3v is doing well, they should also be stable, since this voltage powers the standby and the spi flash 25Q40 (8pin) should be stable at 3.3v.

Hi Lotas! Me here again. Analyzing the 3.3v voltage it is also oscillating and then I realized that when removing the inductor from the 3.3v dc/dc regulator (this regulator receives 13v from the source board), after removing the inductor, the 13v from the source board stabilizes, however, As I said, I didn't find any type of short or apparent leak. I also checked if the 3.3v regulator heats up beyond normal, but it doesn't heat up at all. Don't you have the schematic for that board? Now I tried to read the 24512FD (it has pins 1-4 connected to gnd) but it gave an error and I couldn't read it.