Macintosh Color Classic Need Help

[sub2001zero]

I need help with replacing a SMD. On the back of the logic board there are Gray N1 mount SMD that read 11.98 to 12m ohm. I need to replace on of them can it be replace with a SMD Chip Surface Mount 1206 or not so I need your help.

I replace all the caps and still nothing when I try to turn it on. The N1 mount was corroded Gray N1 mount SMD was bad so I don't know if that is the problem why it won't turn on. The one that is bad is on the left side near top when when you flip the board over it under the 47uf cap.

 

[MacTech68]

I can't find a reference for the under/bottom/solder side for the Color Classic logic board. Are you abble to assist with some pictures of the part you are referring to?

Also, remember that to power up the Color Classic, you need to flick the mains power switch on the back next to the IEC power inlet, AND push the power button on your keyboard.

 

[sub2001zero]

Hi thanks for the reply. The resistor was not the problem I clean it but it still not working. I have turn the back switch and push the switch on the key board nothing.

I take out the board and the fan start running and hard drive also hear it spin. I also took all the ran out and still nothing. I think the board is bad. I also test the leads on the cap and seam fine. ?????

 

[MacTech68]

Try removing the battery on the logic board and leave it out. Let the board sit that way overnight, and then try again WITHOUT replacing the battery.

It's possible that a track has been etched by the leaking capacitors.

Look for tracks with black spots or areas that are blackened. Check those tracks for continuity.

Again, good focused pictures should be helpful.

 

[sub2001zero]

I will post some picture by the end of next week and thanks for the help.

 

[havokalien]

All the surface mount capacitors on the motherboard need replaced. This is a common known failure point. make sure to wash the board well after removal and be completly dry before trying to power on.

I have repaired about 6 of these and caps and goo from them do alot of damage.

You may have to check some of the traces afterwards to make sure none of them were damaged from goo rot.