Interesting... if it's not the analog board, maybe it'd be some capacitor on the main board or something? I have no clue...
On Saturday, February 1, 2014 6:45:44 PM UTC-5, Notgoing Totellyou wrote: > > yeah when he slides his plus main board in there it works fine, so its not > the analog board.. > Also when he turns up the brightness up, the line gets brighter.. there is > nothing else on the crt other then the horizontal line on the tube. > done the VIDOUT signal pass through a transistor on the main board, i see > that vidout does come from the BMU0 i'C > > > Charles > MacCaps.com > > > > On Feb 1, 2014, at 6:32 PM, Tom Frikker wrote: > > 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] >> 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. >> >> >> > -- > -- > ----- > 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. 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