Help with malfunctioning Sealife SL960D strobe light

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Hi all, i have an old (underwater) strobe light (Sealife SL960D, like this one: SeaLife SL960D Digital Pro Flash Working Condition | eBay).

Flash fires when I set it in test mode, however, when I am trying to trigger it with a camera internal flash, it does not respond to it.

I did some troubleshooting. The photo sensors are responding to light. So when no light, it reads 11V, and with intense light it goes to almost 0V. It does not seem to work with resistance, so in other words, no matter light or not, it reads infinite resistance.

Can someone help and share if he/she has seen anything similar? thx
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