The TV is a 40" TV, brand Medion. This brand is sold in Europa by Aldi (Hofer in Austria)

and is known for its "basic" quality. I guess the price was around 250-300€ (I found an offer of 299€ for a 55" TV).

On the Medion homepage, there is no useful information for this device. No firmware files, but a store for some spare parts.

If you open the TV, there are basically 3 PCBs:

•  The mainboard, marked with 17MB82S. There is a Mediatek MT5820LUNU processor, a CI slot, all the HDMI/AV/DVB-S/DVB-T stuff and the amplifier for the built-in speakers. Maybe interesting: 2x SPI Flash chips: 25Q32FVS & 25Q64FVS

•  The power supply
•  The LCD driver board

After some research, I found following details:

• This TV is manufactured by Vestel, it seems they are a big contract manufacturer for TVs
• You will easily find a technical manual for the 17MB82-S mainboard.
• Firmware upgrades are done by: pressing the OK button on the remote & power-on. The firmware will be loaded from a FAT32 USB flash drive.
• According to the technical manual, there are UART pins on the SCART plug: pin 18 is GND, pin 12 is RX of the CPU, pin 10 is TX of the CPU. 115200, 8N1
• Vestel's technical manuals are funny: copy & paste images from datasheets, marked as confidential
• Do not trust the manuals: there are many different revisions of boards out there

Time spent: 20h, mostly for finding infos on the internet