Hey,
I’ve highlighted what i think is each area on the board, i could be wrong though as it’s hard to say without measuring directly. Question marks on components i can’t quite make out.
If the front panel 7-seg display is lighting up then we can rule out the Linear regulator and in turn also the bridge rectification diodes. If the front panel controls work and alter the display then we can rule out MCU & EEPROM. If fan control/speed works we can rule out TIP IC.
So it seems as though possibly the triac is stuck on, try measuring directly across two of it’s leads at a time in resistance and see if any are short. If yes, desolder it and measure out of circuit to confirm.
Can you take a photo of the board button/display side in it’s entirety so I can see the associated solder joints, i see what look like a lot of cold joints elsewhere and am wondering if thats what caused the failure to begin with.
Is this 110v or 220/240v?
Worst case, if that isn’t the problem, then my ultra cheap station is a variant of this model and i can crack mine open for testing