Hello there,
I'm currently trying to finish the repair of my Color Classic but it kinda went wrong.
Quite some time ago I did a full recap of all the logic and analog board, with deep cleaning. After calibrating all the video part it was working well.
But all that calibration was done while beeing at an event and when a came back home my CC didn't survived the travel.
Here the few thing that went wrong:
I did manage to find out why the green signal was missing, it's a bad contact between the analog board and the CRT's neck board in the RGB signal cable. It will be a pain to fix since the connector is glued but doable.
I don't know where to start.
Capacitors have been properly replaced, I double checked.
I suspect something needs to be replaced or adjusted like the CRT is not properly driven.
Unrelated but 12V and 5V are fine and stable.
Any ideas?
I'm currently trying to finish the repair of my Color Classic but it kinda went wrong.
Quite some time ago I did a full recap of all the logic and analog board, with deep cleaning. After calibrating all the video part it was working well.
But all that calibration was done while beeing at an event and when a came back home my CC didn't survived the travel.
Here the few thing that went wrong:
- Missing green signal
- Hissing/"crispy" noise when plugged and power switch turn on (noise stay the same if the computer is booted) - only for few minutes, disappear when AB is warmed up
- Constrast is higher than expected
- Video crunched and deformed (see picture, dotted yellow rectangle represents the actual video size when everything is ok)
- Sometimes video goes off for fraction of time with a "tick" sound (kinda like a defective flyback on a iMac) - mostly when the computer is not warmed up
I did manage to find out why the green signal was missing, it's a bad contact between the analog board and the CRT's neck board in the RGB signal cable. It will be a pain to fix since the connector is glued but doable.
I don't know where to start.
Capacitors have been properly replaced, I double checked.
I suspect something needs to be replaced or adjusted like the CRT is not properly driven.
Unrelated but 12V and 5V are fine and stable.
Any ideas?