Working on a WG4900. Problem is that it doesn't turn on, although the fuse is good. I *believe* the 130v line on the back of the board wasn't at 130v. Tried swapping the voltage regulator, still no go although I couldn't get a reading on that line before a bad storm blew in and I had to close up shop. (Watching some pretty incredible lightning at the moment)
Anyhow, one thing I did realize, is by accident, I plugged my cord into the wrong outlet and ran the monitor off direct power instead of isolated. Nothing happened. This tells me there's something on the AC end of things open. There's 6 main diodes, and looking at the monitor from the back, the 4 to the left of the varistor all read good, the 2 to the right of the varister seem to read the same either way, and on another one I'm working on, I saw different readings with them backwards, but not MUCH different. Not sure if this is normal or not. I'll have to check them out of the circuit I suppose.
Anyone have any ideas?
Jeff
Anyhow, one thing I did realize, is by accident, I plugged my cord into the wrong outlet and ran the monitor off direct power instead of isolated. Nothing happened. This tells me there's something on the AC end of things open. There's 6 main diodes, and looking at the monitor from the back, the 4 to the left of the varistor all read good, the 2 to the right of the varister seem to read the same either way, and on another one I'm working on, I saw different readings with them backwards, but not MUCH different. Not sure if this is normal or not. I'll have to check them out of the circuit I suppose.
Anyone have any ideas?
Jeff
