Thread

MACINTOSH COLOR CLASSIC TURN UP HELP!!!

68kMLA Hardware 41 posts Mar 29, 2015 to Mar 30, 2015

#1 Sun, 29 Mar 2015 - 21:47 68kMLA

I have a macintosh color classic, a very nice and clean piece with no rust dust or any molding anywhere in it.. the only issue it has it is it doesnt turn on.. ive stripped it all down and cleaned it all up.. when its fired up without the logic board, it turns on fine, i can hear and see the fan running, i can hear the hard drive spinning well good.. it just all sound good but nothing on the display.. however when i put the logic board in and turn it on, i dont hear any fan or hard drive sound neither anything on the screen.

I have researched and theres only a very brief help on with this specific macintosh model as its just very rare.. I have read online where the guy advised to clean the logic board connectors to the other parts inside.. did that very well, replaced all capacitors, cleaned the connector inside the machine aswell. tried with or without PRAM battery, tried it with swapping the ROM SIMMS around, tried with the ram chips around.. still no help..

its very strange as it turns on without the logic board and it doesnt with it so it is the logic board for sure, and while the macintosh is running, i tried put the logic board in then and i do see the green light turning on at the front but thats still no help..

the motherboard is actually very clean compared all the other macintosh's ive dealth with in the past most probably because its the newer model then them.. see the image attached and any help would be deeply appriciated.. please dont ask stuff like whether ive left the machine on for a whole night as ive already read about that because it really doesnt help ..

Thanks

#2 Sun, 29 Mar 2015 - 22:06 68kMLA

The leaky caps can cause extra nearby damage even if it looks clean. The problem is probably from leakage from the capacitor nearest to the battery. There's a particular via that tends to rot out. Have you checked the advice from this thread? You should check continuity between the two points on the bottom of the board that I jumped together with wire. If there is no continuity, that via probably rotted out. If there is, it might be wise to check all of the other vias in that area of the logic board. You can see the traces underneath U7 and U8 in my picture. Those chips are involved in the startup circuit on the logic board, so broken connections in that part of the board could definitely be causing the problem you're seeing.

#3 Sun, 29 Mar 2015 - 23:17 68kMLA

i am just about to have all the board now and see whether if theres a link broken.. i hope it is and so i can fix it now haha

#4 Sun, 29 Mar 2015 - 23:27 68kMLA

Silly question... you are using the power button on the keyboard after you flip the switch on the back, right?

#5 Sun, 29 Mar 2015 - 23:28 68kMLA

Even several years ago, when their capacitors were in a healthier state, disused CCs sometimes needed to be left plugged in overnight (switched on round the back) and then booted. Try that.

#6 Mon, 30 Mar 2015 - 00:09 68kMLA

dougg3
I to be honest dont know how to spot a rotted trace but i have stilled patched it just like you did in your picture but it didnt work.. would it be okay for you to tell me what other ones need patching please??

see the image attached please..

MinerAli dont think its jus about the keyboard button as ive already tried that but didnt work..

beachycovei will try that after i fix all these patches on the board as recomended by dougg3.

#7 Mon, 30 Mar 2015 - 00:37 68kMLA

also literally douse these areas with 91% IPA, Flood it, and get that tooth brush and start brushin.

goo gets pulled into tough spots causing electrical shorts.

then after you do that, remove the pram battery, plastic battery holding clip, and ram and vram simms.

put it in the oven about the middle, set temperature and bake it @ 190 degrees F for 15-20 minutes

( non preheat ) that is the key.

#8 Mon, 30 Mar 2015 - 00:45 68kMLA

Do i have to remove he capacitors while doing all this and also will anything burn out while i put it in the oven for 20 minutes? Like that yellow motherbooard connector to the machine?

#9 Mon, 30 Mar 2015 - 00:48 68kMLA

I wouldn't blindly apply the patch I suggested...if you have a multimeter, put it into continuity test mode and see if there is already continuity between those two points.

#10 Mon, 30 Mar 2015 - 00:50 68kMLA

Unfortunately dont have a multimeter .. How can i spot a rotton link anyways?

#11 Mon, 30 Mar 2015 - 00:53 68kMLA

Your gonna have to replace those capacitors. When you remove them and clean the board look for bad traces.....then repair and replace capacitors. If not your fighting a losing battle.

#12 Mon, 30 Mar 2015 - 00:55 68kMLA

Can i not just take the capacitors off, clean the board then put them back on?

#13 Mon, 30 Mar 2015 - 01:02 68kMLA

anything on that board can handel high temps. except the plastic that holds in the battery, the soldered battery holder is also good for those temps.

I wouldn't suggest something that would melt your board…

#14 Mon, 30 Mar 2015 - 01:05 68kMLA

Right okay.. I will get the 99.9% isopropyl alcohol, take the stuff off, clean it up bake it all .. Then cool it down and re solder NEW capacitors and hopefully it should work then.. Shell i leave the logic board soaked in the isopropyl alcohol for a whole night maybe?

#15 Mon, 30 Mar 2015 - 01:27 68kMLA

really electrolyte likes water the best. if your gonna wash it.

super hot soapy water… in the kitchen sink. scrubber down. then a hot water rinse with the spray hose.

compressor dry, then bake.

if you were not going to wash then a good douse with IPA and tooth brush can do the trick.

#16 Mon, 30 Mar 2015 - 01:29 68kMLA

Okay then i'll just use fairy liquid with very hot water and still use brush to clean it and leave it for a night then bake and all

#17 Mon, 30 Mar 2015 - 01:32 68kMLA

na i wouldn't leave anything in liquid over night.

that is just silly ness… a good hot wash, rinse and (compressor dry) then bake… everything with in 30 minutes.

#18 Mon, 30 Mar 2015 - 01:32 68kMLA

Okay

#19 Mon, 30 Mar 2015 - 01:33 68kMLA

Thank you very much

#20 Mon, 30 Mar 2015 - 01:37 68kMLA

are you in the US? they got decent multimeters at Wal-Mart for cheap.

They also have decent multimeters at Harbor Freight too, if you are only looking to spend 10-15 bucks.

Otherwise get someone you know to buy a Fluke for your Christmas or Birthday present.

100-Authentic-from-font-b-Fluke-b-font-Shanghai-116C-font-b-116-b-font-HVAC.jpg.602e0851371bafd35b7516f0782cc4d3.jpg

#21 Mon, 30 Mar 2015 - 15:53 68kMLA

i put it in hot water with fairy liquid, cleaned it all up with a brush and then put it in the oven for just 2 minutes and i saw smoke coming out, took it out this is what its done to my board.. see the piks attached please

#22 Mon, 30 Mar 2015 - 16:04 68kMLA

jus cleaned the burnt stuff away and can see broken traces now.. its just gone worse now no?? i dont think i'll ever be able to get this fixed now or even any cc board

#23 Mon, 30 Mar 2015 - 17:16 68kMLA

Well, the traces look fixable. I'm a little worried about the 68030 in that first picture. Looks like you'll need a new fuse, new microphone and audio jacks, and whatever that box thingy is.

#24 Mon, 30 Mar 2015 - 17:33 68kMLA

The 6030 is perfectly fine, its few pins r just bent thts all.. Nothing broken

#25 Mon, 30 Mar 2015 - 17:34 68kMLA

How will i get the box thingy and all the traces done? How can i fic the traces? Did these traces break because of baking it?

#26 Mon, 30 Mar 2015 - 17:37 68kMLA

I just dont wana make it any worse then it is now.. I know

If i mess it

Up then i aint getting any new one

#27 Mon, 30 Mar 2015 - 17:46 68kMLA

Can i not send it to any of you who know it well how to deal with it ? Ive heard uniserver does it everyday? How

Much would

You charge me and everything .. I just want it working.. If these cc were alot to be bought then i wouldve tried my techniques on it but as its very rare, i really dont wana kill it .. How much would it be and i also have se/30 board to be fixed .. Replay asap please

#28 Mon, 30 Mar 2015 - 18:11 68kMLA

Where do you live? I have a spare Color Classic motherboard you can have for postage.

#29 Mon, 30 Mar 2015 - 18:29 68kMLA

Does the board all properly work? I am from UK but i dont mind paying the postage afterall you are doing so much for me ..

#30 Mon, 30 Mar 2015 - 18:33 68kMLA

I have a macintosh se/30 and a performa board to be fixed aswell.. Is it okay if i can show you guys piks of them ..

#31 Mon, 30 Mar 2015 - 20:18 68kMLA

hi rollermanz

Im over in Ireland.

Would be glad to have a look at all 3 boards for you. Ive recapped about 40 macs now.

What happened - that looks like something blew when it was plugged in

come on.... did you plug it in and not leave it dry long enough!!!!

most of the damage looks like straight forward fix. I have old boards to replace the mic and headphone

what temp was the oven at!!!!

shipping over to Ireland is not bad - Ill do the fix for free. you just cover the postage

let me know

cheers

#32 Mon, 30 Mar 2015 - 21:22 68kMLA

Can't get a better deal than that.

#33 Mon, 30 Mar 2015 - 21:35 68kMLA

Oh my god, oh my

God are actually going to fix them all for me ???? OH MY GOD!!! i cant explain how happy i am.. Can i have your email or phone number right now please ? Just drop me a text and i will call you back straight away 07415432370 rollerman21@hotmail.com please thanks alot

#34 Mon, 30 Mar 2015 - 21:36 68kMLA

Yes thats right this is the best deal ever ..

#35 Mon, 30 Mar 2015 - 21:36 68kMLA

I just want it all fixed as i cant wait for them all

To work..

#36 Mon, 30 Mar 2015 - 21:45 68kMLA

email sent to you rollermamz

#37 Mon, 30 Mar 2015 - 22:05 68kMLA

That looks like you used the broiler, you wanted bake, temperature was suppose to be 190F not C.

and yes i bake boards all the time, never does anything like that happen to me. Your best bet is to just step away from the boards

and let fallen have a go

He's a good man... makes really entertaining and informative videos.

#38 Mon, 30 Mar 2015 - 22:07 68kMLA

what happened to the 68030???? - look at the pins.... bent, broken...........jasus!!!

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anybody rekon this board has gone beyond the point of no return

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the cpu looks like it was hit by something...........maybey still functional.

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as for the rest..........anybody care to offer a prognosis

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hey uni.....what do you think

#39 Mon, 30 Mar 2015 - 22:08 68kMLA

No the cpu is still fine.. It does have bent pins but they r all connected and perfectly working ..

#40 Mon, 30 Mar 2015 - 22:17 68kMLA

my diagnosis is this color classic is done for. its almost looks like he took it out of the oven and then start to stab it with a screwdriver LOL

#41 Mon, 30 Mar 2015 - 22:21 68kMLA

No lol i jus put it away thats all what i did ..