I have a mac classic ii rev A and after a recap of the logic board still gets the checkered screen. I also have a working mac classic that I put the board into and still got the same pattern and I've been looking at the schematics and haven't found anything yet. Is there something I'm missing, a chip that goes bad, or what else can I do?
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Recapped Mac Classic ii Checkered Screen
- Thread starter DomDom
- Start date
Can you post some photos of your logic board please? There could be cap goo under the Egret chip (U10) or around that area, because there are 4 caps there which all cause problems. Usually removing/cleaning it resolves this, but there can be other reasons for the checkerboard pattern.
Not the issue here but have you re-capped the analog board too? If not, that will be necessary for a Classic as they all have leaky capacitors by this point.
Not the issue here but have you re-capped the analog board too? If not, that will be necessary for a Classic as they all have leaky capacitors by this point.
The board looks too dirty, there is lots of residue/goo around all over the place. This capacitor leakage residue causes shorts.
It needs to be scrubbed/washed with soapy water, then rinsed well with isopropyl alcohol 99%, and then left to dry thoroughly for several days.
Are you sure this has been recapped?
This capacitor doesn't look new, it has damage to the top:
It needs to be scrubbed/washed with soapy water, then rinsed well with isopropyl alcohol 99%, and then left to dry thoroughly for several days.
Are you sure this has been recapped?
This capacitor doesn't look new, it has damage to the top:
I agree with all that has been said. Capacitors have been replaced in my opinion, probably new, but yes cleaning the board is more important than having new caps.
Fluid is conductive and can easily make nasty things.
the Egret is contaminated, should be removed, cleaned and soldered back.
and yes, the AB board should have new caps as a minimum.
Fluid is conductive and can easily make nasty things.
the Egret is contaminated, should be removed, cleaned and soldered back.
and yes, the AB board should have new caps as a minimum.
How did you go? Did you manage to fix the issue
Oh bummer, sad to hear. Sometimes we just have to give up - I am sure you still had a few handy learnings out of this case.
