UN40D5500RG stuck in bootloop after update

[emilioea]

Hello! There seems to be a lot of wise people here, perhaps I can find help and help others.
I have an UN40D5500RG led, and it bricked after an Internet (trough wi-fi) attempt to update.
Now it just turns on, shows the "Samsung SMART TV" logo, shows "AV Input" for 3 seconds, and then turns off, and the cycle starts again. The TV was working fine before, so I discard a power board failure.
I have made an Exlink cable, but since Debug menu wasn't active when it bricked, its not very useful. I have tried all TDM codes but to no avail. Tried all known remote codes, none of them work.
Fiddling with I2C bus (shoting data, clock, etc) does not work either. USB shows no communications (for example to read a stick and flash firmware).

Output from console looks like this:

Code: Select all

Switch to Earphone UART                                                        
SEC                                                                            
                                                                               
Switch to Micom UART                                                           
                                                                               
                                                                               
=================================                                              
onboot (Feb 25 2011 - 16:08:03)                                                
release ver : 1002 - RELEASE                                                   
etc :                                                                          
=================================                                              
                                                                               
Onboot X6 Sync mode                                                            
LCD FastLogo Run...                                                            
Loading Kernel....                                                             
load kernel start, size : 131072 + 3538944 byte                                
Jump Kernel....                                                                
                                                                               
auth success by h/w sha1 UART1 is used to UART or logic mode.    

I have some programming skills and electronic knowledges, for example I can connect an arduino and get an eeprom dump/modify some values... I don't want to buy a main board replacement (yet) because it will hurt my electronic engineer pride!!!

Can anybodie help me?

[juancomcel]

hi I have a LED TV of the same model and is working properly. if I explain how to make the connection UART or I2C or USB protocol can esctraer my TV firmware and send by e -mail

[darinus]

I have the same problem with the UN40D5550RF. Would love to know how to fix it. Searched around and found that the EEPROM should be reset, but I am not sure how to do this on my main board.