Here is a dump of a Samsung UE48HU7590: Board is HU8500 BN41-02257B. TV starts for 1 second with "Smart TV" logo and then turns off screen. No reboot loop. Maybe you can find here a defect in the SPI EEPROM. I added the second EEPROM which is behind the little black heatsink as well in the ZIP.
issue solved. I got another motherboard BN41-02257B from an UE65HU8290LXZG BN94-08099E that works as well with the 48" display. I dont know if that is just luck but picture is okay.
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