Ok, just used a test pin to short circuit to two pins as marked in the wiki. But unfortunately the picture is still distorted and the tv is still stuck in the reboot loop.
I`m in doubts. Can be:
1. you haven`t proceed the eeprom reset procedure well and it didn`t worked. Possible even if proper made eeprom resed won`t help
2. Possible, that this board is not compatible to other hardware on TV (LVDS?)
3. Mainboard you got is damaged
You should search local serviceman to check it... I can`t help, this issue is out of my knowledge. apologies.
Yes, you have
-unplug from power
-connect two pins (sometimes there is no contact - pins may be coated) and keep it connected
-power tv and wait until LCD is light up
-release pins
-use remote control to power tv off to standby mode
-info menu mute power to get it direct to service menu
Just an follow up question: What would be an alternative for me now? Get the exact same board type that others here have successfully used to upgrade from UExxC6000?