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

[lotas]

Hi lotas,
can you help me with this firmware???

Samsung UE55MU6400U
M/B BN41-02568B (BM94-12401R)

Hi, I can, try it.

[Me_you_them]

Nothing to do....
Standby led turns on and immediately off, sometimes led bars turns on and off imediately

[lotas]

Nothing to do....
Standby led turns on and immediately off, sometimes led bars turns on and off imediately

Was this dump native, original, status register (0x88, 0x42) written after recording the dump?

[Me_you_them]

Was this dump native, original, status register (0x88, 0x42) written after recording the dump?

Yes the dump was the original native one, status register done, i followed the instruction on the post #4

[lotas]

What program did you use?
NeoProgrammer V2.2.0.10 ?
Did you program the chip through a clothespin or solder the chip through an adapter?

[Me_you_them]

What program did you use?
NeoProgrammer V2.2.0.10 ?
Did you program the chip through a clothespin or solder the chip through an adapter?

I've used NeoProgrammer V2.2.0.10 and I've desoldered the chip from the mainboard and soldered on the adapter to program it

[Me_you_them]

Maybe I found the problem...
I noticed that the component indicated in the photo it's no longer there, probably has blown out during the desoldering of the chip.
Is there any solution?

[Mr.Pc]

Hey guys! I also have my Samsung TV UN65MU6100G whith main pcb model/code: BN41-02568B and power supply: BN44-00808D which is not turning on and only has the standby LED blinking. I opened the TV and did some tests with the source board and the LEDs light up and the voltage is stable. It has two eproms and I believe the problem is in one of them. Could anyone help me with this, I extracted the file from both. Thank you in advance for everyone's attention!

[lotas]

Hey guys! I also have my Samsung TV UN65MU6100G whith main pcb model/code: BN41-02568B and power supply: BN44-00808D which is not turning on and only has the standby LED blinking. I opened the TV and did some tests with the source board and the LEDs light up and the voltage is stable. It has two eproms and I believe the problem is in one of them. Could anyone help me with this, I extracted the file from both. Thank you in advance for everyone's attention!

25Q40 is working, have you disconnected the lvds cable from the motherboard? (in this case how TV behaves)

[Mr.Pc]

25Q40 is working, have you disconnected the lvds cable from the motherboard? (in this case how TV behaves)

I disconnected the lvds cables and it remains the same. I noticed that when I plug in the power supply, the voltage fluctuates as if there was a short on the main board. I found an inductor L406_UT on the main board that has a very low resistance of 0.04ohms. I don't have the schematics so I don't know if it's right.

[lotas]

I disconnected the lvds cables and it remains the same. I noticed that when I plug in the power supply, the voltage fluctuates as if there was a short on the main board. I found an inductor L406_UT on the main board that has a very low resistance of 0.04ohms. I don't have the schematics so I don't know if it's right.

There is a negative voltage (VGL) on the T-CON, so one inductor should be connected to ground with one terminal, to convert the negative voltage relative to the ground, rather this is this inductor, check how it is connected.

[Mr.Pc]

There is a negative voltage (VGL) on the T-CON, so one inductor should be connected to ground with one terminal, to convert the negative voltage relative to the ground, rather this is this inductor, check how it is connected.

I have already checked your connection and everything is normal considering this negative voltage. I've already checked the USB and HDMI and there is no short. I also checked two mosfets that are in the connector that comes from the power supply and there are no shorts, which is why I was doubting the 25q40.

[lotas]

I disconnected the lvds cables

Did you place a jumper on the motherboard between contacts FB_TRDY_1 and FB_TRDY_3 (feedback)?

[Mr.Pc]

Did you place a jumper on the motherboard between contacts FB_TRDY_1 and FB_TRDY_3 (feedback)?

Not yet because I don't know how to identify these points. What I did was disconnect the lvds cables and turn on the TV without them. 😅

[lotas]

Not yet because I don't know how to identify these points. What I did was disconnect the lvds cables and turn on the TV without them. 😅

Post a high-quality photo in the area of the lvds connectors.

[Mr.Pc]

Post a high-quality photo in the area of the lvds connectors.

I managed to find the points you mentioned, but I don't know how to identify them like that on the PCB. My camera isn't the best, but I believe I can see it. I marked a red dot in each place. I also want to thank you for your time and attention.

[lotas]

These ones.

[Mr.Pc]

These ones.

So I make a jumper between the two, connect the LVDS cables and turn on the TV?

[lotas]

So I make a jumper between the two, connect the LVDS cables and turn on the TV?

One at a time, and you will see which half of the panel is not working, if the problem is in the panel.

[Mr.Pc]

One at a time, and you will see which half of the panel is not working, if the problem is in the panel.

I made the jumper and tested one side at a time, but it still didn't work. In any case, I am grateful for your dedication.