4BSOD-123F MM1Z2V2SemtechZener diode http://www.s-manuals.com/smd/4b
On Sat, Mar 24, 2018 at 4:47 PM, Pete Turnbull via cctalk <cctalk@classiccmp.org> wrote: > After a recent power cut and a series of glitches as the power was > restored, one of my Indys suffered a PSU failure. It's a Sony APS-81 171W > unit, SGI P/N 060-0008-001. I've found half a dozen damaged parts, and I've > identified a 150R 1W metal film resistor (R135), two trannies (Q105, a > 2SC4304 and Q106, a 2SC2785) and a couple of small diodes. One of them > (D116) appears to be a 6.2b2 (6.2V 1/2W) zener. > > The other one I'm not sure about. On the PCB it's labelled D113, and > it's adjacent to the 2SC2785. It's very small, with a green band at the > cathode end, and the legend "4B" in green - photos at > https://www.flickr.com/photos/pnt103/albums/72157667056183978 > > Oddly, another Sony PSU I looked at had a diode there that looked > identical except it's marked "4A". > > I have an idea what it might be but if anyone actually knows what family > or type/value this is, I'd be grateful for any insight. > > -- > Pete > Pete Turnbull
