I think your vertical sweep is broken. A possible fix is to resolder the joints of connector P1. If this doesn't work, let me know and I'll keep looking for clues. Tom
On Saturday, February 1, 2014 6:21:04 PM UTC-5, jWs wrote: > > > Have him turn up the brightness to see if it's scanning the full screen. > > If it's not, then the prob is still on the A/B board. > > - JS > > On 2/1/14 6:00 PM, Tom Frikker wrote: > > Hi Charles, > It sounds to me like the component that "stretches" the video vertically > has failed, and therefore, it's just a horizontal line in the center of the > screen. Does this sound correct? I'm pretty sure that maybe electromagnets? > do the "stretching", so maybe something that powers the vertical ones > failed. Sorry for the bad terminology, but this might be something to look > into. > Tom > > On Saturday, February 1, 2014 5:10:06 PM UTC-5, Notgoing Totellyou wrote: >> >> I re-capped my buddys A/B, really all it needed was C1, pretty typical … >> >> I changed those caps, sent it back, didn't bother to test it because >> he said it still sorta worked. >> >> Anyways. he got it back, and now when he flips it on, hears the bong, >> but on the screen all he has is a horizontal line. >> I think it even boots from a disk too! >> >> Anyways i told him to try his plus main board, just to make sure >> something funny didn't happen with the A/B i re-capped for him. >> and sure enough the plus main board works fine with the A/B , so the >> Issue is not the A/B. >> >> He said that when he removed the A/B originally, to send it to me, He >> used an alligator jumper and connected it to the screwdriver and the case, >> and not to the ground lug at the top of the screen, >> said it made a pretty good pop too. >> They make sure to say, on most of those apple sites. connect to the >> ground to the ground lug. >> >> >> So i my question is, What do you think went out on his main board? >> he is probably going to send it to me to fix, I don't mind.. ill help em >> out. >> But just not sure where to start looking. >> >> let me know if you have any pointers. >> >> maybe i will get him to send you something out for helping me fix it :) >> >> Thanks >> Charles >> >> >> >> I am looking at the schematic here. >> either i am getting older or this one just looks blurry. >> >> http://www.digibarn.com/collections/diagrams/mac-512klogicboard/mac-logic-schematic.jpg >> >> >> -- > -- > ----- > You received this message because you are a member of the Vintage Macs > group. > The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our > netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml > To post to this group, send email to [email protected]<javascript:> > To leave this group, send email to > [email protected]<javascript:> > For more options, visit this group at > http://groups.google.com/group/vintage-macs > > Support for older Macs: http://lowendmac.com/services/ > --- > You received this message because you are subscribed to the Google Groups > "Vintage Macs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/ --- You received this message because you are subscribed to the Google Groups "Vintage Macs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
