Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!uwvax!umn-d-ub!umn-cs!berlin!grg From: grg@berlin.acss.umn.edu (George Gonzalez) Newsgroups: comp.sys.mac Subject: Re: Dead Mac Plus Screen Summary: It may not be the flyback... Message-ID: <578@berlin.acss.umn.edu> Date: 19 Aug 89 19:39:08 GMT References: <89228.113355GAB100@PSUVM> <16@fleet.UUCP> Organization: U of M MicroGroup, Minneapolis Lines: 18 If you have the dreaded "vertical line" symptom, its probably just a bad solder connection on the analog board. The most common troble spots are in the high-current circuit to the horizontal yoke. Often the crummy nylon plug and socket will overheat and melt the solder that connects it to the pc board. If you look closely at the connector pin, you'll see a round blob of solder, often forming a hemispherical shell *over* the connector pin, but no longer in contact with it. A touch with a soldering iron will temporarily fix the problem. A longer lasting fix is to replace the overstressed connector with something more robust. A good choice would be a "trailer light connector" from a auto-parts store. Other parts in this high current loop can fail too. The capacitor leading to the yoke can overheat and fail, as can the solder joints to it. These are easily repaired if you know what to look for. As always, don't try this if you don't know what you're doing.