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

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lotas

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Join Date: Jan 2016

Posts: 4861

Country: Russia
#101

08-29-2024, 02:51 AM

Originally posted by Me_you_them

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

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

Hi, I can, try it.
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UE55MU6400U_fix.rar (62.2 KB, 4 views)
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Me_you_them

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#102

08-29-2024, 05:47 AM

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

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#103

08-29-2024, 07:39 AM

Originally posted by Me_you_them

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?
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Me_you_them

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#104

08-29-2024, 07:47 AM

Originally posted by lotas

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
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lotas

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#105

08-29-2024, 10:01 AM

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?
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Me_you_them

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#106

08-29-2024, 11:41 PM

Originally posted by 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?

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
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Me_you_them

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#107

08-30-2024, 12:51 AM

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?
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Mr.Pc

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#108

10-08-2024, 11:38 AM

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!
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W25Q40CL@SOIC8.rar (62.1 KB, 5 views)

W25Q80DV@SOIC8.rar (37.9 KB, 3 views)
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lotas

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#109

10-08-2024, 01:08 PM

Originally posted by 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!

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

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#110

10-09-2024, 08:53 AM

Originally posted by lotas

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.
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lotas

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#111

10-09-2024, 09:06 AM

Originally posted by Mr.Pc

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.
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Mr.Pc

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#112

10-09-2024, 09:16 AM

Originally posted by lotas

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.
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lotas

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#113

10-09-2024, 09:27 AM

Originally posted by Mr.Pc

I disconnected the lvds cables

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

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#114

10-09-2024, 10:47 AM

Originally posted by lotas

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. 😅
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lotas

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#115

10-09-2024, 11:17 AM

Originally posted by Mr.Pc

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.
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Mr.Pc

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#116

10-09-2024, 11:48 AM

Originally posted by lotas

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.
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lotas

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#117

10-09-2024, 11:56 AM

These ones.
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Mr.Pc

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#118

10-09-2024, 12:10 PM

Originally posted by lotas

These ones.

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

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#119

10-09-2024, 12:14 PM

Originally posted by Mr.Pc

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.
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Mr.Pc

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#120

10-09-2024, 12:50 PM

Originally posted by lotas

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.
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