Hey guys, sorry to spoil the party here, but I have a cautionary tale that will hopefully prevent others from totally destroying their MBW-150.
I was also excited about the prospect of getting my dim OLED repaired. But I got impatient (happens a lot), and decided to dig-in. My thought was to take the good OLED from my "executive" model (I don't care for the metal band), and use it to replace the dim OLED in my "classic" model.
Now, I'm not a watch expert. But I'm relatively tech/mech savvy. So I unscrewed and removed the back without incident. The battery is right there, and can be easily replaced. However, I'd recommend getting a pro to do it, so that they can replace the water seal on the cover before closing it. Anyway, that's about all I'd say can be serviced on the watch.
To get the rest of the watch out of the housing, you need to remove a few more screws, and you also need to remove the crown (the thing you use to set the time on the hands). I don't know how to remove the crown, and ended up breaking the spindle in the process. Oh, well; at that point, I knew I was hosed. So I figured I'd learn what I could so I could post it here. I assume that someone more knowledgeable about watches could remove the crown without damage.
Now, the way the "movement" is constructed, there's a main board sandwiched between the "face" and a rear plastic housing. The OLED is, of course, on the front side of the board, which means you need to remove the face to get access to it. As netstat_EVO mentioned, that involves removing the hands. I couldn't see how to do that without damage. Since I knew I was already hosed, I just broke them off. Again, I assume an experienced person could do that without damage. Then the face slides right off, and there's the OLED.
Now here's the kicker. The OLED is attached to the main board by a short ribbon cable. And that cable, with its two dozen or so thin leads, is totally baked onto the board - no socket there, at least not on mine. Now, I could be wrong, and if so, someone please correct me. But I don't think that cable can be removed from the board without destroying the "landing" area. Probably someone with the right tools could do the repair, but those would be some pretty specialized tools. I'm handy enough with a soldering iron, and I can tell you, that wouldn't do it.
I still have two MBW-150s, and I love them. (OpenWatch on Android rocks!) But now I'm resigned to the fact that eventually the OLEDs will die. And aside from being reasonably good looking watches, they won't be anything special.
If you think you'll have better luck than me, then by all means, please try! I wish you the best. And thank you very much to netstat_EVO for posting your info!