my TV died overnight, probably due to OTA updates, I'm not sure. Did not touch the service menu, micom update stuff or something like that.
It does immediately power on when AC is connected, does not react to any keys and - unfortunately - I'm not even able to enter the service menu.
One or two years ago, I gained root access using the SamyGo Smart Hub method, but I was not using it lately. Not sure if this is helpful.
I tried an EEPROM reset as described in the wiki https://wiki.samygo.tv/index.php5/UnBri ... PROM_Reset. Shorted SDA and HRESET for some time (see pic), the TV did stay on longer, powered off later. The screen now does not show "HDMI1" (last used source) anymore, just a blank screen after that. So it did something, but the bootloop didn't stop. I'm now trying to get something useful out of the on-board UART console, which I found on CN801_DB (1=GND, 2=TX, 3=RX, 4=5V, TX/RX 3.3V levels). Parameters are 115200 8N1 as usual. Unfortunately, I only get:
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Hello UART
Any ideas on how to get that UART running? I think I can't enable ExLink because I can't enter the service menu. Perhaps it's possible to find the physical UART wires similar to here https://forum.samygo.tv/viewtopic.php?t=4049#p31473?
I'd like to get access to the bootloader or something similar to reflash exe.img. I already downloaded and decrypted it using the SamyGo Firmware Patcher, now I'm looking for a way to flash it. I'm also thinking about desoldering the I?C EEPROM and erasing it using an Raspberry Pi, but I don't know if that will be of any use.
Any advice, guys? I'm currently lost.