on 9/14/03 5:16 AM, Jens Petersohn at [EMAIL PROTECTED] wrote: > Hi all, > > I have a Color Classic that I bought about a year ago. Lately > the display has started "flickering" in brightness. Occasionally > the picture is really bright and a little smaller and then it > flicks back to normal size. Sometimes this occurs once in a while, > othertimes it happens continiously. > I've had the back off and checked the AB and little board on the > back of the tube for loose connections, burnt components, etc. > > I don't know much about CRT analog electronics so if someone could > suggest a general area to check I would appriciate it. > It seems that the regulation of of beam current from the cathode > to the first set of control plates is not working right... > (but what do I know?) > > Thanks, > > Jens Petersohn
Much, but not all, of the fix revolves around "cold" solder joints. On the bottom of the 'board and on the board on the back of the CRT. You see "oxydized" solder spots that aren't bright silver. Those need to be re-soldered and that normally cures the problems associated with "cold" solder joints such as flickering. Jeff -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
