Leica LED3000 MEB115 schematic needed

[xchg.ca]

Hey guys looking for schematic for Leica LED3000 / MEB115  LED light module
Looks like tiny zenner is gone and the module if not operational
Will be nice to have schematic or service manual to fix it
It is very hard to use microscope without appropriate light
Thank you !

[xchg.ca]

Here is how the board looks like
After tracing the board, it looks like blown diode is a protection diode
What would you guys suggest to replace it with?

[coromonadalix]

check u7 markings and try to see if the diode is used around it,  try to find application notes for u7, you could find some infos

[Jon_S]

U7 is the venerable LM2675.

If you have traced the board and are sure it isn't a series diode for reverse protection, then D2 was possibly a TVS. I can't really make out the tracking from the photo.

The absolute maximum input voltage for the 2675 is 45V, so you need a TVS with a clamping voltage at or below this to be of any use. It looks like the package is SOD-323, so something like this one possibly:

D22V0S1U2WS-7

Found a picture of the device and it says the operating voltage is 24V. Need a TVS with a higher standoff for that, and that makes the gap between standoff and clamping narrow for a TVS, not much choice. I only found one suitable diode after a quick search:

https://www.vishay.com/en/product/85915/

[xchg.ca]

Thank you guys for helping out
I forgot to mention very important info - that power supply is 33V DC for this LED module

And using my cellphone as light source and the microscope I had barely made out E3 on charred body of the diode. This seems to be falling under switching diodes judging by Google research results.
Can it be reverse polarity protection diode - regular switching diode? Not sure why would it die though.... as this module using has own proprietary power-supply, no way you can put it reverse
Only possibility higher current that diode can handle.

[xchg.ca]

I have fixed it.
Turned out it is one of ceramic caps that sits on +30V rail got shorted !
Here is how it looks
New diode is 1n914 ( smallest I had on my hands )