Samsung UN70RU7100K halfway bricked after messing with service menu

[Daniel Valdez]

Dear All,

FAFO is the correct definition of what happened with my Samsung UN70RU7100K TV, I was trying to change the region to enable samsung plus using the service mode, entered the mode mute 1 8 2 pwr, and started to dig in. Did some changes while having digital TV signal in the back instead of doing it in HDMI standby mode, I remember changing to a region different then mine but also had a different tuner $%&!. After rebooting the TV, it was all gone, now it shows the splash image and then no image at all. If i disconnect the lan cable from the back, a message is shown in the upper right corner, if I plug it again the message is back saying the cable was connected. I am unable to connect to smartthings, nor does it enter again in service mode to revert the changes. If the tv stays on for a while it switches to the screensaver displaying a moving samsung logo. I overnighted a CH341A programmer with connectors to read the I2C 24512FD eeprom and maybe find a somebody who can help me fix this mess. Any ideas are greatly appreciated.

Thanks
Daniel

[KYBOSH]

Damn.... new fear unlocked.
Some chips have a reset feature but Im not sure if yours do.
You'll have to DL the data sheet and verify.

[Daniel Valdez]

Damn.... new fear unlocked.
Some chips have a reset feature but Im not sure if yours do.
You'll have to DL the data sheet and verify.

Thanks for the tip, I'll check both the spi and i2c ics, I did try following a wiki shorting sda and gnd on the i2c with no avail, didn't cross my mind to check the datasheet file!

[lotas]

Before you go into the service menu and change anything there, you need to make a copy of the original eeprom on the programmer and if something went wrong, you could return everything to its original state.

[Daniel Valdez]

Before you go into the service menu and change anything there, you need to make a copy of the original eeprom on the programmer and if something went wrong, you could return everything to its original state.

I have found a .bin file for a UN43RU7100K tv but the file is 1mb in size and the i2c eeprom on my unit is 512kb. A bit confusing, is this file for both spi and i2c eeprom? Can I dump my EEPROMs and do a bit compare?

Can someone share some light?
I have the firmware file but It seems to be encrypted, binwalk is not able to extract it, is there a way to get the eeprom data from the firmware file?

Thanks
Dan

[lotas]

I have found a .bin file for a UN43RU7100K tv but the file is 1mb in size and the i2c eeprom on my unit is 512kb. A bit confusing, is this file for both spi and i2c eeprom? Can I dump my EEPROMs and do a bit compare?

Can someone share some light?
I have the firmware file but It seems to be encrypted, binwalk is not able to extract it, is there a way to get the eeprom data from the firmware file?

Thanks
Dan

1Mb is more like a dump from t-con spi flash (25Q80). From the update you will not be able to help but extract the 25C512 eeprom file, since it is individual for each TV model, it contains all the settings of the native model and all serial numbers, MAC adress, panel and its settings, keys, ...).

[Diah]

try leave it over night out from wall socket.... to let it discharge

[Daniel Valdez]

try leave it over night out from wall socket.... to let it discharge

Nothing happened that was my first attempt
Thanks

[lotas]

Here are two dums for experimentation.

[Daniel Valdez]

1Mb is more like a dump from t-con spi flash (25Q80). From the update you will not be able to help but extract the 25C512 eeprom file, since it is individual for each TV model, it contains all the settings of the native model and all serial numbers, MAC adress, panel and its settings, keys, ...).

what about backing up my existing crappy eeprom and flashing one of a similar unit? I mean can't break it more than it already is right?

[Daniel Valdez]

Here are two dums for experimentation.

Thanks mate will give it a shot this afternoon!!