Hello, Are there any iMac G3 experts in the group? I have never seen a CRT/TV do this before (I used to work in TV repair, but that was in the late 70s through 1983, so I am a tad rusty. I replaced the flyback and horz output to get this iMac to come on. The unblanking has vertical strips in it, missing video. This one had worked almost perfectly until the first time I turned it off (it was having display size jittering, and some flashing, so I assume the flyback was failing). I doubt the CRT got damaged while sitting on the floor of my storage room for a week or so. I have no idea if this could be the video out of the computer board or the display board. I checked all display board caps before replacing the flyback and horz output. If I changed the OS resolution down to 800x600, the blank vertical lines are still there. Could be a yoke, but the mouse passes through the blank line, like they still there. If I move a window, the window doesn't jump across the lines. So it kind of looks like a really weird unblanking issue. I cannot find schematics for this thing anywhere. [image: image.png]
Hello Dave, You will need to provide a link to the picture because attachments don't work in this email list, which is run by mailman. If you are local, then I suggest that you bring it to our next repair workshop so that others can help you diagnose the problem. Jeff Brace On Sat, Nov 18, 2023 at 3:33 PM Daveyk021 via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Hello,
Are there any iMac G3 experts in the group?
I have never seen a CRT/TV do this before (I used to work in TV repair, but that was in the late 70s through 1983, so I am a tad rusty. I replaced the flyback and horz output to get this iMac to come on. The unblanking has vertical strips in it, missing video. This one had worked almost perfectly until the first time I turned it off (it was having display size jittering, and some flashing, so I assume the flyback was failing). I doubt the CRT got damaged while sitting on the floor of my storage room for a week or so. I have no idea if this could be the video out of the computer board or the display board. I checked all display board caps before replacing the flyback and horz output. If I changed the OS resolution down to 800x600, the blank vertical lines are still there. Could be a yoke, but the mouse passes through the blank line, like they still there. If I move a window, the window doesn't jump across the lines. So it kind of looks like a really weird unblanking issue. I cannot find schematics for this thing anywhere.
[image: image.png]
Btw, mailman does support the passing through of images both inline or attached. It is a setting to allow it/disallow it. I don't know where the setting is, but I belong to half-a-dozen other mailman lists which support it. The setting might be under "Content Filtering" 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos -----Original Message----- From: vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> On Behalf Of Jeffrey Brace via vcf-midatlantic Sent: Sunday, November 19, 2023 11:01 PM To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Jeffrey Brace <jeffrey@vcfed.org> Subject: Re: [vcf-midatlantic] IMAC G3 Problem Hello Dave, You will need to provide a link to the picture because attachments don't work in this email list, which is run by mailman. If you are local, then I suggest that you bring it to our next repair workshop so that others can help you diagnose the problem. Jeff Brace On Sat, Nov 18, 2023 at 3:33 PM Daveyk021 via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Hello,
Are there any iMac G3 experts in the group?
I have never seen a CRT/TV do this before (I used to work in TV repair, but that was in the late 70s through 1983, so I am a tad rusty. I replaced the flyback and horz output to get this iMac to come on. The unblanking has vertical strips in it, missing video. This one had worked almost perfectly until the first time I turned it off (it was having display size jittering, and some flashing, so I assume the flyback was failing). I doubt the CRT got damaged while sitting on the floor of my storage room for a week or so. I have no idea if this could be the video out of the computer board or the display board. I checked all display board caps before replacing the flyback and horz output. If I changed the OS resolution down to 800x600, the blank vertical lines are still there. Could be a yoke, but the mouse passes through the blank line, like they still there. If I move a window, the window doesn't jump across the lines. So it kind of looks like a really weird unblanking issue. I cannot find schematics for this thing anywhere.
[image: image.png]
I think the attachment option was turned off intentionally at some point a long time ago. It would need to be a "business" decision (Steering Committee?) to turn it back on. On Mon, Nov 20, 2023 at 10:09 AM W2HX via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Btw, mailman does support the passing through of images both inline or attached. It is a setting to allow it/disallow it. I don't know where the setting is, but I belong to half-a-dozen other mailman lists which support it. The setting might be under "Content Filtering"
73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
-----Original Message----- From: vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> On Behalf Of Jeffrey Brace via vcf-midatlantic Sent: Sunday, November 19, 2023 11:01 PM To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Jeffrey Brace <jeffrey@vcfed.org> Subject: Re: [vcf-midatlantic] IMAC G3 Problem
Hello Dave,
You will need to provide a link to the picture because attachments don't work in this email list, which is run by mailman. If you are local, then I suggest that you bring it to our next repair workshop so that others can help you diagnose the problem.
Jeff Brace
On Sat, Nov 18, 2023 at 3:33 PM Daveyk021 via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Hello,
Are there any iMac G3 experts in the group?
I have never seen a CRT/TV do this before (I used to work in TV repair, but that was in the late 70s through 1983, so I am a tad rusty. I replaced the flyback and horz output to get this iMac to come on. The unblanking has vertical strips in it, missing video. This one had worked almost perfectly until the first time I turned it off (it was having display size jittering, and some flashing, so I assume the flyback was failing). I doubt the CRT got damaged while sitting on the floor of my storage room for a week or so. I have no idea if this could be the video out of the computer board or the display board. I checked all display board caps before replacing the flyback and horz output. If I changed the OS resolution down to 800x600, the blank vertical lines are still there. Could be a yoke, but the mouse passes through the blank line, like they still there. If I move a window, the window doesn't jump across the lines. So it kind of looks like a really weird unblanking issue. I cannot find schematics for this thing anywhere.
[image: image.png]
I'm on at least one list with attachments enabled, where some people keep replying to messages that include the attachments, ad nauseum. I prefer this list the way it is. On Mon, 20 Nov 2023, Chris Fala via vcf-midatlantic wrote:
I think the attachment option was turned off intentionally at some point a long time ago. It would need to be a "business" decision (Steering Committee?) to turn it back on.
On Mon, Nov 20, 2023 at 10:09?AM W2HX via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Btw, mailman does support the passing through of images both inline or attached. It is a setting to allow it/disallow it. I don't know where the setting is, but I belong to half-a-dozen other mailman lists which support it. The setting might be under "Content Filtering"
73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
-----Original Message----- From: vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> On Behalf Of Jeffrey Brace via vcf-midatlantic Sent: Sunday, November 19, 2023 11:01 PM To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Jeffrey Brace <jeffrey@vcfed.org> Subject: Re: [vcf-midatlantic] IMAC G3 Problem
Hello Dave,
You will need to provide a link to the picture because attachments don't work in this email list, which is run by mailman. If you are local, then I suggest that you bring it to our next repair workshop so that others can help you diagnose the problem.
Jeff Brace
On Sat, Nov 18, 2023 at 3:33?PM Daveyk021 via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Hello,
Are there any iMac G3 experts in the group?
I have never seen a CRT/TV do this before (I used to work in TV repair, but that was in the late 70s through 1983, so I am a tad rusty. I replaced the flyback and horz output to get this iMac to come on. The unblanking has vertical strips in it, missing video. This one had worked almost perfectly until the first time I turned it off (it was having display size jittering, and some flashing, so I assume the flyback was failing). I doubt the CRT got damaged while sitting on the floor of my storage room for a week or so. I have no idea if this could be the video out of the computer board or the display board. I checked all display board caps before replacing the flyback and horz output. If I changed the OS resolution down to 800x600, the blank vertical lines are still there. Could be a yoke, but the mouse passes through the blank line, like they still there. If I move a window, the window doesn't jump across the lines. So it kind of looks like a really weird unblanking issue. I cannot find schematics for this thing anywhere.
[image: image.png]
Mike Loewen mloewen@cpumagic.scol.pa.us Old Technology http://q7.neurotica.com/Oldtech/
Same here, strongly. Pass by reference, not by value. -Dave On 11/20/23 12:24, Mike Loewen via vcf-midatlantic wrote:
I'm on at least one list with attachments enabled, where some people keep replying to messages that include the attachments, ad nauseum. I prefer this list the way it is.
On Mon, 20 Nov 2023, Chris Fala via vcf-midatlantic wrote:
I think the attachment option was turned off intentionally at some point a long time ago. It would need to be a "business" decision (Steering Committee?) to turn it back on.
On Mon, Nov 20, 2023 at 10:09?AM W2HX via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Btw, mailman does support the passing through of images both inline or attached. It is a setting to allow it/disallow it. I don't know where the setting is, but I belong to half-a-dozen other mailman lists which support it. The setting might be under "Content Filtering"
73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
-----Original Message----- From: vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> On Behalf Of Jeffrey Brace via vcf-midatlantic Sent: Sunday, November 19, 2023 11:01 PM To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Jeffrey Brace <jeffrey@vcfed.org> Subject: Re: [vcf-midatlantic] IMAC G3 Problem
Hello Dave,
You will need to provide a link to the picture because attachments don't work in this email list, which is run by mailman. If you are local, then I suggest that you bring it to our next repair workshop so that others can help you diagnose the problem.
Jeff Brace
On Sat, Nov 18, 2023 at 3:33?PM Daveyk021 via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Hello,
Are there any iMac G3 experts in the group?
I have never seen a CRT/TV do this before (I used to work in TV repair, but that was in the late 70s through 1983, so I am a tad rusty. I replaced the flyback and horz output to get this iMac to come on. The unblanking has vertical strips in it, missing video. This one had worked almost perfectly until the first time I turned it off (it was having display size jittering, and some flashing, so I assume the flyback was failing). I doubt the CRT got damaged while sitting on the floor of my storage room for a week or so. I have no idea if this could be the video out of the computer board or the display board. I checked all display board caps before replacing the flyback and horz output. If I changed the OS resolution down to 800x600, the blank vertical lines are still there. Could be a yoke, but the mouse passes through the blank line, like they still there. If I move a window, the window doesn't jump across the lines. So it kind of looks like a really weird unblanking issue. I cannot find schematics for this thing anywhere.
[image: image.png]
Mike Loewen mloewen@cpumagic.scol.pa.us Old Technology http://q7.neurotica.com/Oldtech/
-- Dave McGuire, AK4HZ New Kensington, PA
Best service I've come across in years allows totally anon and instant hosting: curl -F'file=@yourfile.png' https://envs.sh Just put your local image name as 'yourfile.png' - it's magic. try it. I love that service whomever they are! Images go away after a few months. It's perfect for things like this list. And yes, please do not allow images on this list, bad things can only happen. -andy
On Nov 20, 2023, at 12:27 PM, Dave McGuire via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
Same here, strongly. Pass by reference, not by value.
-Dave
participants (7)
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Andrew Diller -
Chris Fala -
Dave McGuire -
Daveyk021 -
Jeffrey Brace -
Mike Loewen -
W2HX