Fixing DS411Slim - No uart output (1 reply)

I got a free DS411slim because "it wasn't working anymore". I already did a lot of troubleshooting and testing but I'm stuck atm. Maybe someone of you has an idea what I could try or whether this thing actually turned into a brick.

It didn't power up at all. Short blue blink then off. After some research online I did the following steps:

1. Disconnect every drive, disassemble the whole thing to get access to the MB.

2. Bridge the Q3 transistor with a multi meter: DS starts, fan spins, blue light of death flashing.

I will replace the transistor when the parts arrive. Strangely the DS now powers up by pressing the power button, no bridging necessary anymore *shrug* (still blue light of death tho)

3. I tried 2 other power supplies (all 12V 3A) - still blue light of death

4. New CMOS Battery

5. Connected a USB-to-TTL to:
- DS Pin 2 (GND) -> GND Adapter
- DS Pin 4 (TX) -> RX Adapter
- Baudrate 115200 as suggested in available resources online

However, I do not get any output from the uart console. Completely blank. Am I doing something wrong or is the device gone for good?

I appreciate any ideas or feedback. Thanks for reading.