Samsung UE55NU8005T , rebooting , no picture , no backlight

[rui4892]

Good morning.

the original board of this equipment is in reboots without giving an image or turning on the backlight, the board code is BN94-12926P (BN41-02636), I made a copy of the flash ic1603 and ic1604, dumps attached. I tried to put other dumps (from other popis models I didn't find this board) but without success. That said, I bought a board on ebay BN94-12926A, which in principle should at least give image, even if with defects, this board turns on and responds to the command but does not give any indication of image despite the availability of VHG and VGL voltages as well as the others. with the doubt that the panel was damaged I took a board of model QE55Q70R (BN94-14330B), with this board gives image, although with some vertical lines that can be seen in the attached photo, that is, I effectively deduce the panel is ok, but it does not seem to be fully compatible with this board.

Can you please check if the dumps of the original version are ok? Thank you.

[Diah]

why yours SPI W25Q40BL, it should be W25Q40CL, as i know... so you need another version of programmer.. how ever all 3 spi are in tact

[rui4892]

why yours SPI W25Q40BL, it should be W25Q40CL, as i know... so you need another version of programmer.. how ever all 3 spi are in tact

My programmer for read/write that devices is the XGecu Pro TL866II-Plus, it automatically detects the flash parameters, such as manufacturer, capacity, ID, etc... I've been using it for a few years and without any problems so far, I don't think the problem should come from there.

thank you.

[Diah]

i wrote all 3 dumps are fine.. but the name detected wrong.. you can read the Chip label you will see its W25Q40CL

[rui4892]

i wrote all 3 dumps are fine.. but the name detected wrong.. you can read the Chip label you will see its W25Q40CL

Sorry my friend... I didn't read your answer carefully, so I definitely have 2 boards with problems other than the eeprom... thanks anyway.

[Diah]

i don't think you have 2 MB defect.. but panel yes.. you can compare the LVDS socket configuration and pins over all 3. boards..

[lotas]

Can you please check if the dumps of the original version are ok? Thank you.

So, where are your dumps? I don’t see them?

[rui4892]

So, where are your dumps? I don't see them?

I'm sorry, I don't know what happened, I didn't edit the topic but in fact the dumps disappeared from the initial post, I don't think I broke any rules, until the user "Diah" saw them... I'll post here again. thanks

[lotas]

Dumps 25Q40, 25Q80 you are fine, the problem may be in eeprom 24C512 and eMMC, the panel settings are also in eeprom 24C512, you also need to pay attention in the t-con area there are positional resistors, they are set correctly for each panel model .

[rui4892]

Dumps 25Q40, 25Q80 you are fine, the problem may be in eeprom 24C512 and eMMC, the panel settings are also in eeprom 24C512, you also need to pay attention in the t-con area there are positional resistors, they are set correctly for each panel model .

hello again... Next Monday, when I return to work I will compare the two boards next to the TCON area, the panel in question is BN95-05417A 55S1AU0SN, the board I bought from ebay was, according to the seller, a broken TV. Have a nice weekend and thank you very much for your support.

[rui4892]

good morning.

back to work. I photographed both boards and only modified the resistors on board A (ebay), the areas where I intervened are marked with a circle. No legible image has yet appeared, just vertical scratches... unfortunately I don't have a manual and I'm not sure which resistors to modify, if it's possible to have access to this information or the board's manual that would be great... thank you.