Un50mu6070 Mainboard issue

[Alex Corps]

Hi, when I want to write the status registers I don't have the same thing at all as in your image.

[petersor]

Updated the firmware on the 24C512 with your file and it's still not working. I'll try the 25Q80 file at some point, but I'm going to shelf this project for now. I started restoring a Pioneer SX-1010 recently and I want to spend time on that. Thanks again for your help. I'll revisit this post when I pick this project back up.

[lotas]

Ok!

[petersor]

Thanks. I'll give them a try when I get back home . . . travelling this weekend.

[lotas]

Not yet, I haven't had time yet, I'll try to look tomorrow.
For now, try these two dumps for 25q80 and 24c512 for diagnostics.

Status register for 25Q80 (0x98.0x02).

[petersor]

lotas were you able to find anything in the 24C512 dump?

[petersor]

Here's the data from the 24C512 eeprom . . .

[lotas]

Try reading the firmware from eeprom 24c512 and posting it.

[petersor]

Thanks anyway. It was a good learning exercise and I appreciate all your help. Guess this one is destined for the landfill.

[lotas]

Oh, I don’t even know, I don’t have the firmware for your panel (T-CON 25Q80) to compare. The problem may be in the eMMC, or perhaps in the processor itself...

[petersor]

lotas - any thoughts on this? Anything else to look at before I scrap it?

[petersor]

Reflowed the crystals and processor . . . no change. Maybe one of the boost or buck converters? They appear to be proprietary Samsung ICs so not much else to do at this point, I think. I suppose I could try reflowing those - especially IC401 / VLS1R0A. Voltages are wrong around that one . . . maybe I have a board with that IC on it. to try swapping it out.

[petersor]

Panel number is CY-GK050HGAV5H

[petersor]

I'll check the panel number when I get back to the house tomorrow. I'll try reflowing the crystals first and if that doesn't help, I'll try the main processor . . .

[lotas]

Voltages and resistances are the same with the jumper in place.

This chassis also had problems with the crystal falling off the substrate, remove the radiator and blow on the crystal with a soldering station for 30 seconds at a temperature of 200-250C.

[lotas]

What panel do you have, number CY-xxxxxx?

[Diah]

from yours measurement and test with Jumper and with out, it tell you have cut off of the I2C from the SoC. its 99% BGA. need to refllow

[petersor]

Voltages and resistances are the same with the jumper in place.

[petersor]

OK. I'll add the jumper back and test again. Thanks for your patience.

[lotas]

It is necessary with a jumper to see the remaining voltages.