Mac Classic no boot

[Popjoel]

No bong, someone knows what's wrong?

 

[bibilit]

Caps or worse battery probably.

 

[Popjoel]

Français ?

 

[Popjoel]

The battery is new and the caps of the analog board too.
The failure is random, after a few minutes it starts, sometimes ....

 

[bibilit]

Français ?

yes

the caps of the analog board too.

And the ones on the Logic Board ?

 

[Popjoel]

No! They did not seem damaged. That could be that?

 

[bibilit]

Yes, like all boards of this era, should be done anyway.

 

[Popjoel]

OK I will do it. Another advice? A particular component? While I am there ;-)

Thank You bibilit

 

[bibilit]

Another advice?

get the board washed at the same time.

 

[Popjoel]

I'm sorry, I'm using a translator.
A recommendation . Un conseil ?

 

[Popjoel]

OK, Thank you.

 

[dochilli]

Check the voltages at the floppy port. Must be 12, -12 and 5 V. Lower than 4.75V will result in a checkerboard screen. But if you recap the AB the voltages shoud be ok. Otherwise you have some other parts on the AB that shoud be replaced.

 

[Popjoel]

Capacitors replaced, voltage ok. Which components need to be replaced ?