Yeah I’d say so as well, can’t figure out why though?!
Did you slice this one?
No, I sliced the dome off the top so it was flat, then used gas to get rid of the rest the phospher didn’t come off this time, must be all about timing in the gas with this one
I’m guessing a bond wire broke when slicing(partly why I suggest lubrication, other part is cleaner cut). It’s also possible a pad on one side of the substrate didn’t wet to the Noctogon and you’re only getting current through half the die. Did you test it before dedoming?
At any rate, thank you for sacrificing your time and money for what I like to call "BLF Science". 
Like they always say, "someone has to take a hit for the team." 
Success!
I switched onto a different MCPCB and we have power to all 4 dies!
It is possible to de dome an XHP!
Congratulations!
Now I'm going to recheck a XHP50 on which I lost two dies as well, see if a fresh reflow will revive iit
Nice, that is some very interesting news 
Maybe your other 2 XPH50’s can be revived also?
Nope the other 2 can’t be revived, one has missing phosphor, (in gas to long?) and the other looks like broken bond wires (hot de dome)
If the silicon floats in gas then maybe put the mcpcb in face down so the phosphor won’t lift off with dome bits. Just a though, maybe irrelevant.
Have this way ever been tested on the MTG2? first slice then a quick gas dedome for the rest…….if it works as good as on the XHP50’s maybe thats an safer way for them also.
Maybe Cereal Killers MT-G2 dedome method will work best for this?
I don’t think you’ll be able to use the gas method on MTG2 I tested a scrap MTG2 to see if it would work, it doesn’t, you’ll just end up with a lot of phosphor if not all of it floating off
I sliced the third one before de domed it, but onviouslyndisngbpolish it, however it did look ok just how it was, that is with a flat ‘cloudy’ top (considering the dome is already ‘cloudy’ compared to XML etc)
Ok thanks, good to know.