Colour Classic glitch

[skeletor]

I'm putting together one good Colour Classic, from parts of three CC Carcasses...Here's a video glitch...When it boots up, the picture has a green tint..colours look washed out...When I give it a slap on the left side of the CC.towards the back...The tint problem goes away..and the picture looks normal..until it does it again...Once I slap it, again problem ceases.

woukd like to fix this, and stock pile some CC parts..in case one day, she decides to take the day/week/month/year off..

 

[TheNixer]

Skel, you should see my CC today. I know it's got a good working analog board. I'm a bit sick with all my video issues lately. I'm down to my Plus and an SE/30. :'( I'm seriously considering taking all my classics to the local TV repair shop and seeing if they can help me. I don't even own a soldering iron.

 

[Bunsen]

You got a bad solder joint or loose connection in the red feed ... somewhere. The suggestion of taking it to a TV repair guy is a good one, as this is a classic (snort) CRT failure mode.

Those guys really like it when you bring documentation, like the dev notes or service manual.

 

[MacMan]

Another thing to try is replacing the PRAM battery in your CC. Worked for me when the screen on mine went green.

 

[TheNixer]

Do they have developers notes or a service manual for a Mac Plus or SE? I'm sure there's no schematic lying around. Gee, it'd be great if we had a SAMS on them. In fact, I intended to bring along Tom Lee's PDF. I don't know them personally but I wonder if they'd laugh at me?

I thought about having them replace that C1 capacitor just for good measure while they're in there.

 

[tomlee59]

I'm putting together one good Colour Classic, from parts of three CC Carcasses...Here's a video glitch...When it boots up, the picture has a green tint..colours look washed out...When I give it a slap on the left side of the CC.towards the back...The tint problem goes away..and the picture looks normal..until it does it again...Once I slap it, again problem ceases.

woukd like to fix this, and stock pile some CC parts..in case one day, she decides to take the day/week/month/year off..

Successful slappage tells you that it's most likely a loose connection. These are easily fixed -- the tricky part is finding them. Look for bad solder joints. Freshen up any of them that look suspicious. Disconnect connectors, inspect and clean if necessary, and reassemble. In your case, pay special attention to the CRT socket itself (not the HV "suction cup" connection -- I mean the socket at the rear of the CRT). A little investigation, and you should be able to get that one to behave.

 

[skeletor]

I'm putting together one good Colour Classic, from parts of three CC Carcasses...Here's a video glitch...When it boots up, the picture has a green tint..colours look washed out...When I give it a slap on the left side of the CC.towards the back...The tint problem goes away..and the picture looks normal..until it does it again...Once I slap it, again problem ceases.

woukd like to fix this, and stock pile some CC parts..in case one day, she decides to take the day/week/month/year off..

Successful slappage tells you that it's most likely a loose connection. These are easily fixed -- the tricky part is finding them. Look for bad solder joints. Freshen up any of them that look suspicious. Disconnect connectors, inspect and clean if necessary, and reassemble. In your case, pay special attention to the CRT socket itself (not the HV "suction cup" connection -- I mean the socket at the rear of the CRT). A little investigation, and you should be able to get that one to behave.

good points...and I suspected as much....Most problems with our CC and other similar compacts are glitches like this. Most are connections and joints that need to be 'refreshed' or so on...I guess these machines are far exceeding their operational lives..and hence some of these 'new' problems. did anyone at APPLE, ever remotely think that 1993's Colour Classic, would be in service, in 2008...15 yrs down the time line ...same goes for our beloved compacts like the PLUS, SE, etc....

The trick is to take time, and slowly track these problems down...and if possible, stock pile several 'donor' compacts, for needed parts...

Myself, have done this..including some decent burn free CRTS from SE's & Plus..I've seen some badly burned in tubes..complete with images burned in 'em..forever.....MB's and Analog boards are worth stock piling, as well as some of those SE power supplies...( sony etc )

Great that we can access a forum like this to help keep our little friends alive...

 

[skeletor]

Skel, you should see my CC today. I know it's got a good working analog board. I'm a bit sick with all my video issues lately. I'm down to my Plus and an SE/30. :'( I'm seriously considering taking all my classics to the local TV repair shop and seeing if they can help me. I don't even own a soldering iron.

Going to a TV shop, could end up being somewhat costly...unless the tech or owner, has mercy..and cuts you a deal....

perhaps a trip to Cleveland, the center of the universe for TN, with some of my parts, might be in order....(LOL)

bytheway, No CC today. I don't expect it until the weekend...It's only a matter of time before FEDEX absorbs the USPS, as they are taking over more and more of their mail...including large pkgs/bulk mail and more.

Uncle Sam wants to get outta the mail biz...

 

[Bunsen]

[!] !]'>

 

[Bunsen]

I'm sure there's no schematic lying around.

http://dyne.org/museum/apple/stuff/mac/andreas.kann/schemat.html

 

[TheNixer]

I was hoping someone would challenge me. Bunsen, you rock.

 

[Bunsen]

Not as much as IIsi does

 

[Byrd]

Another thing to try is replacing the PRAM battery in your CC. Worked for me when the screen on mine went green.

You probably pushed something back in when replacing the battery

JB

 

[tmtomh]

Successful slappage tells you that it's most likely a loose connection. ... In your case, pay special attention to the CRT socket itself (not the HV "suction cup" connection -- I mean the socket at the rear of the CRT). A little investigation, and you should be able to get that one to behave.

I agree this is a likely cause of problems. Often the glue/gook used to keep the video board secured to the CRT neck socket dries out (or has been cut by someone servicing the unit in the past), making the connection liable to work loose if the machine is transported or jostled (or if it just sits in a place with temperature and humidity variation). A little hot glue, applied while gently pressing the video board onto the CRT socket to make sure it's fully seated, might do the trick. (All of this happening with the machine turned OFF of course!)

M

 

[skeletor]

Successful slappage tells you that it's most likely a loose connection. ... In your case, pay special attention to the CRT socket itself (not the HV "suction cup" connection -- I mean the socket at the rear of the CRT). A little investigation, and you should be able to get that one to behave.

I agree this is a likely cause of problems. Often the glue/gook used to keep the video board secured to the CRT neck socket dries out (or has been cut by someone servicing the unit in the past), making the connection liable to work loose if the machine is transported or jostled (or if it just sits in a place with temperature and humidity variation). A little hot glue, applied while gently pressing the video board onto the CRT socket to make sure it's fully seated, might do the trick. (All of this happening with the machine turned OFF of course!)

M

I concur as well....it's amazing as these macs get older, how humidity can reek havoc on 'em...and keeping in mind, how old some of the ones still in service..I don't think the design team & engineers ever thought back in late 1992-early 1993, these machines would be existing and running 15 yrs down the line...today, stuff like the i-Mac, was design with a longer life span..but I have seen my share of i-Macs, with bad board boards..especially the 233 and 264 mhz versions..

One thing that I hated about the CC...is what a pain in the arse, to get at and remove the HD..and floppy drive...unlike many other similar macs

 

[MacMan]

You probably pushed something back in when replacing the battery

JB

Now I think of it, that is a much more logical explanation. It needed replacing anyway and when the problem went away with a new PRAM battery I just assumed they were related.