[bojan]

One more check:
The encircled ICPWR3 ( marked "G2" or similar, it is not clear) is 2-input gate.
With shutter button half-pressed, there is a VCC on pin 5 as it should be, and HIGH level on pin 2, LOW on pin 1 (testpoint VB2ON). Output (signal TIN) is LOW
If this is AND gate, then there should be LOW level.
If this is NAND gate, it is blown.

I am giving up for now..