I was thinking of trying with the chip removed, so I think I will do that. I have a multimeter of course, which is how I have been tracing already. The scanner idea is a good one too, and if nothing else at least it gives me an idea of where to probe without too much flipping of the board.
Thanks Rob > -----Original Message----- > From: cctalk [mailto:[email protected]] On Behalf Of shadoooo > via cctalk > Sent: 28 June 2017 18:52 > To: cctalk <[email protected]> > Subject: RE: DECstation 220 - Out of Ideas? > > Hello, > now you could try to check the voltages again, just to be sure the fault is > not on > the 245. > > Following the traces is of course obviously difficult, but if the board is > really > only two-sided (no internal signal layers), components are not too high, and > you > have a flatbed scanner, you could scan both sides, then colorize top in green > and bottom in red, flip bottom and do a properly aligned overlay with a > graphic > editor like GIMP. > It's a matter of few minutes, but could improve the work. > When you are unsure, try with the multimeter. > > Andrea
