IDX PRO blown D4 diode....anyone seen this? Anyone know the value?

[IDXKevin]

I just noticed this,it looks like it's been fried for awhile but the detector still turns on and works somewhat. The entire side is split and burnt. What could cause such a thing?? Anyone know the values for a replacement please? Looks like 0247. Is this a Zener?
Thanks guys!!

[kt315]

near U4? 1N4001?

[IDXKevin]

Yes.

[golfnut]

maybe the batt got fitted backwards, this is like an intentional short circuit so you dont nuke all of the components, just the diode.

Currenlty you have NO protection - cut it out and fit a replacement £0.10p

[Koala]

maybe the batt got fitted backwards, this is like an intentional short circuit so you dont nuke all of the components, just the diode.

Currenlty you have NO protection - cut it out and fit a replacement £0.10p

yep battery wrong way round

Someone else had one go less than a year ago. Was the only damage.

[IDXKevin]

excellent thanks guys! I have absolutely no idea how that could've happened as the battery can only go in one way but ill fix it. maybe happened before I got it.
thanks again!