looking for Info about Flyback for Classic II

[saxonas]

Hi guys i hope you can help.
I have an Apple Classic II which im trying to restore.The problem is that i cant find a replacement for the flyback.Any ideas for a replacement part or maybe compatible flyback with different serial ?

thank you !

 

[jajan547]

Hi guys i hope you can help.
I have an Apple Classic II which im trying to restore.The problem is that i cant find a replacement for the flyback.Any ideas for a replacement part or maybe compatible flyback with different serial ?

thank you !
View attachment 41625

I have a spare.

 

[joshc]

I have an Apple Classic II which im trying to restore.

What are the symptoms, how have you determined the flyback is bad?

 

[jajan547]

What are the symptoms, how have you determined the flyback is bad?

Agreed, is there a purple glow with lights off?

 

[saxonas]

Agreed, is there a purple glow with lights off?

Yes its bad.I checked it and it is shorted and when I removed it, measurements at it's pins are between 2,9 and 4,9ohms.
The irf640 mosfet also is gone...cooked...

 

[jajan547]

Yes its bad.I checked it and it is shorted and when I removed it, measurements at it's pins are between 2,9 and 4,9ohms.
The irf640 mosfet also is gone...cooked...

PM me I have a spare one for your board.

 

[saxonas]

PM me I have a spare one for your board.

Is it possible to measure and tell me if you find the same readings?(see images)

 

[jajan547]

Is it possible to measure and tell me if you find the same readings?(see images)

Not at home right now but know for a fact the one I have works, I can measure mine when I get home but the one I have is yours for $25

 

[jajan547]

Yeah mine read different on every pin you tested. Here's a pic of what I have.

 

[iZier Museum]

Hi Everyone! I'm a new member here; and unfortunately I have the same problem from Mr. Saxonas.; the difference is that I need a flyback to my CLASSIC from 1991. When I turn on my Mac; they are doing strangers sounds coming from the flyback; and on the screens it's possible to see some flashing vertically. It's possible to solve trying to weld again or I'll need a new flyback? Please let me know! iZier.

 

[jajan547]

Hi Everyone! I'm a new member here; and unfortunately I have the same problem from Mr. Saxonas.; the difference is that I need a flyback to my CLASSIC from 1991. When I turn on my Mac; they are doing strangers sounds coming from the flyback; and on the screens it's possible to see some flashing vertically. It's possible to solve trying to weld again or I'll need a new flyback? Please let me know! iZier.

Do me a favor here and take a picture of the back of your analog board.

 

[iZier Museum]

Hello janjan547; tks for your fast reply. So; I'll need to open my Mac again, and asap I'll post this picture! RGS!!!

 

[jajan547]

Hello janjan547; tks for your fast reply. So; I'll need to open my Mac again, and asap I'll post this picture! RGS!!!

No worries usually respond pretty quick.

 

[iZier Museum]

Nice; I'll continue talking with you by my other post. TKS!

 

[saxonas]

After changing the HOT transistor, the LOPT from JanJan (thank you!), recaping the power supply and METICULOUSLY (I can't stress this enough) cleaning the motherboard, you can see the result! (yes, it's in greek).

 

[cheesestraws]

Nicely done! The Chicago font looks really classy with the Greek alphabet.

 

[joshc]

Congrats, these are not easy machines to work on by any means.