On Sun, 3 Apr 2011 14:08:37 -0700 (PDT), Chairman WAPSAC
wrote:

I have a dead Sea & Sea YS-27DX strobe.

Manual:
http://www.seaandsea.jp/products/strobe/ys27dx/manual_AEKR.pdf
www.seaandsea.com/PDF_manuals/YS27DX.pdf
http://www.seaandsea.jp/products/strobe/ys27dx/

The strobe flooded

Fooded with what? Salt or fresh water?
Have you cracked the case yet?
How are you testing it?
Have you tested the fiber optic trigger cable?
http://www.seaandsea.jp/file_master/adownload/50107_1.pdf
Have you tried using a different camera flash to trigger it?

If salt water, and it was sitting for more than a few days, my
guess(tm) is the damage is more likely corrosion than component
failure. Look for green coppper sulfate crud around the PC board,
components, and transformer windings. It might pay to wash the entire
mess in clean water (several times) to remove any ionic contaminants.
It doesn't take much salt crust on the PCB to short out the hi-voltage
inverter that runs the strobe.

and subsequently let out all the smoke making the circuit work!.

Nope. Water incursion doesn't not produce any smoke.

I appreciate that the damage may in fact be catastrophic but I'll
have a go at fixing it anyway!

Assuming the worst case is often a safe position, but not in this
case. My very limited experience with marine electronics (9.5 years
at Intech Inc designing marine radios) indicates catastrophic damage
is usually accompanied by massive corrosion. More commonly, corrosion
damage rots out the PCB, which prevents power of reaching components,
resulting in a dead circuit. It's very rare for corrosioin to bridge
the few places where a circuit resistive leak would blow something up.
Again, look for corrosion or contamination.

The problem is I don't have any schematics.

Real techs don't need no stinking schematics.

Sea & Sea won't respond to my requests for schematics (no surprise
there then). So I'm wondering if anyone has a schematic for this unit?

Perhaps if you had your request for a schematic written in Japanese?

No schematic, but plenty of similar devices he
http://members.misty.com/don/donflash.html
http://members.misty.com/don/samflash.html
Also, if there are any US patents on the device, they can be found at:
http://www.google.com/patents/

Good luck.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558