This is a SyncMaster 2233SW that worked fine for years, but then the image disappeared. Further investigation showed that the image would display for just a second or so after power-up or after switching inputs. So: looks like classic defective-power-supply problem, probably resulting from crappy electrolytic capacitors.
When I took it apart I found that there were bulging caps and a partially discolored PC board.
Since the PC board itself showed signs of overheating, I thought it better to look for a replacement power-supply module than to simply replace the electrolytics on the old one. I bought one on eBay that was described as having come from a monitor with a cracked screen. It had no sign of bulging capacitors or overheating, but it did not solve the problem. The seller refunded my money and did not want the apparently defective unit returned, so I got a set of replacement capacitors for that one. BUT that has still not solved the problem: with two different computers, whether I use the analog or the digital input, there is an image for just one second or so. AND I do not see any trace of an image when I shine a light onto the screen either.
I cannot find a service manual for this monitor -- at least not without sending money to a person or business of unknown integrity.
Where do I go from here?
Perce