cakebake98
New member
Hello all, new to the forums 
I have a Mac Classic II, which had its logic board recapped, bringing the computer to life. After doing so, I decided to recap the analog board. This killed the mac.
All of this was done several years ago, and I recently decided I want this machine to work, rather than gather dust.
After booting it up, I was greeted with a startup bong and a VERY bright horizontal line. After copious amounts of searching, this is generally attributed to the TEA2037A Horizontal/Vertical deflection IC. However, upon reopening the mac, I actually found that CF4 had its polarity swapped.
Adding insult to injury, I removed the pad leading to pin 14 of the TEA2037A (LINE OUT), but this seems to only be connected to the ground plane of the PCB. (However, given the lack of schematics and component values, I have no clue.)
Attached are images of the mac, the rear side of the analog board, and the section of the board in question.
So, my purpose in posting this:
1) Does pin 14 of the TEA2037A serve any purpose in the Classic II? Do I need to tie it to ground, or can it be floating?
2) What components would I have ruined in swapping the polarity of CF4 (470uf 25v)? (Searching for values and board part #s)
3) Are there known voltages / logic states I can test to determine which components are bad?
3) Are there ANY schematics of the analog board for the Classic II?
4) Are there people around here whom I can send my board to to be diagnosed / repaired if all else fails?
Thank you to all who comment, as any input is appreciated.
I miss my mac :simasimac:
I have a Mac Classic II, which had its logic board recapped, bringing the computer to life. After doing so, I decided to recap the analog board. This killed the mac.
All of this was done several years ago, and I recently decided I want this machine to work, rather than gather dust.
After booting it up, I was greeted with a startup bong and a VERY bright horizontal line. After copious amounts of searching, this is generally attributed to the TEA2037A Horizontal/Vertical deflection IC. However, upon reopening the mac, I actually found that CF4 had its polarity swapped.
Adding insult to injury, I removed the pad leading to pin 14 of the TEA2037A (LINE OUT), but this seems to only be connected to the ground plane of the PCB. (However, given the lack of schematics and component values, I have no clue.)
Attached are images of the mac, the rear side of the analog board, and the section of the board in question.
So, my purpose in posting this:
1) Does pin 14 of the TEA2037A serve any purpose in the Classic II? Do I need to tie it to ground, or can it be floating?
2) What components would I have ruined in swapping the polarity of CF4 (470uf 25v)? (Searching for values and board part #s)
3) Are there known voltages / logic states I can test to determine which components are bad?
3) Are there ANY schematics of the analog board for the Classic II?
4) Are there people around here whom I can send my board to to be diagnosed / repaired if all else fails?
Thank you to all who comment, as any input is appreciated.
I miss my mac :simasimac:
