Jump to content

Classic II Black Screen

Recommended Posts

Another repair, a Classic II, new caps all around, but except for the working fan the screen remained black and got no sound.


The board was cleaned but some goo was still present.


I removed the Egret 




Cleaned pads, soldered back and got a boot...only one  :-/


Then removed the nearby IC (U11), cleaned also legs then soldered back, and this time worked for real, including sound.



Link to post
Share on other sites
  • 3 years later...
  • 68kMLA Supporter

@bibilit Thanks a lot for this post!


My long-owned Classic II suddenly, just a day after using it without issues, exhibited the same symptoms. No sound, completely black CRT, voltages measured on the floppy port all correct. That was really sad - it's my first compact mac and I really wanted it up and running again.


I have recapped this machine a year ago and washed the logic board really, really thoroughly (water + IPA).


As it turned out, desoldering EGRET (U10) and U11 with hot gun revealed quite a bit of sticky goo under them. No traces were eaten, but the goo was probably shorting some pads/vias. After thorough cleaning (the PCB and the chips), bathing the chips themselves in IPA and resoldering all is good again! :) Thanks for this hint!


TL;DR Even after thorough washing, cap goo stays under U10/U11 and prevents the machine from booting. Desolder the chips and clean everything.

Link to post
Share on other sites

Yes, i have seen this issue too often, Classic II and CC are affected a lot (probably pretty close from the surrounding capacitors) in my opinion even a thorough cleaning is unable to solve the issue (or maybe probably using a ultrasonic process)

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...