Black screen after power on (Classic II)

[filipp76]

Hello, my Macintosh Classic II after several month good work dont start up I power on, it makes noise but no start up sound, and monitor is black. What did can broken ?

 

[PowerPup]

Depending on the kind of sound it's making, like electrical buzzing or zapping, the powerboard could have blown out. I would recommend not turning it back on until you get a new powerboard. If that is the case.

 

[filipp76]

No electrical buzzing or zapping, hdd working and cooler working but no start up sound and screen is black

 

[PowerPup]

The motherboard probably died. Don't know if there's any way to fix it. You would have to inspect the motherboard up close.

This guide is for the SE/30, but I'm sure most of it will still apply.

http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html#BlackOut

Some people have had success of reviving motherboards by running them through the dishwasher or cleaning the "capacitor corrosion" by hand with soapy water/rubbing alcohol. If you try this make sure you have rinsed it and let it dry completely before powering it. (Let it sit out in room temperature overnight.)

 

[filipp76]

Great thanks ! I wash motherboard with soap, after in alcohol and all perfectly works, I plane to change capacitors and again wash motherboard in ultrasonic bath.

 

[PowerPup]

Glad to help. The Classic II is a great little machine, it was my first Mac, and I still turn it on once in a while to play around with it.

Have fun with your Classic II!

 

[beachycove]

I have had good success in reviving a Classic II, and a number of other machines, just by washing the logic boards, but I leave the boards to dry for longer than overnight. I tend to give them a few days at least.

 

[filipp76]

After wash i wait 5-6 hour, than clean by alcohol in the hour already it worked