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Nathanplus

Macintosh Plus clicking fast after flyback replacement and recap

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So I'm starting a new topic to update my old one. Check out the whole story on my original issue. After finally getting a new fly back for my mac plus the fast ticking never changed. I checked the voltages on the caps and sure enough the flyback still is not getting enough power. So what I did was first heat up the caps to see if any of the 33 and 22uf caps are bad. They didn't change any thing other than speed up the ticking a little. I have never got it to stop ticking while using the heatgun. Then I thought it was my motherboard so I drowned it in vinegar carefully using an exact-o knife on corrosion and blew under neath every chip on the board to get crud out. This obviously it didn't do anything. Also during all that I cleaned the cable and tried the voltage pot, to see if the voltage was too much or too little. Nothing changed can someone point me in the right direction I'm still at a dead end.

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20190304_190521.jpg sorry it looks crappy I use a LG phone. I cleaned both boards really good so its only the case and the steel that is corroded

 

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Edited by Nathanplus

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One last thing if I didn't mention. When I was diagnosing it still ticked when the motherboard's plug was disconnected, so its the analog board

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Not C1, I used a cap tester and I got the correct capacity rating. 

I mean if I have to I will replace it, but it did read correctly so Idk. 

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I did until I looked under the sticky pad. Well I re-flowed a lot of suspicious solider joints and nothing. So I still have no idea whats happening

I also forgot to mention i did test the diodes and transistors by the flyback, they were all good. I also tested the optocoupler, it turned out good too.

Edited by Nathanplus

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Personally I’d replace all caps...every last

one, including C1. Especially C1. Even if these test good capacitance, it is very likely that they suffer from high resistance with age, which you won’t be testing. Just remember you need a non-polarized cap for C1.

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Right, I'll try my best to get all caps. I really was not measuring resistance meter I was using this capasitence tester. I pulled out the cap and measured it.Image result for capacitance tester

Edited by Nathanplus

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This sounds about right. But I don't know exactly, I checked all the other solutions and this is the best. I also just tested it and I am getting a resistance. Does that mean its good? I mean absolutely I'll do it any way because its just $5. I just want someone to confirm that CR5 is positively dead.

right.PNG

Edited by Nathanplus

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Didn’t know you had access to online Pina...I have the real books. Johnny has a good point there. Also try Macintosh Repair and Upgrade Secrets...sometimes I find that one more helpful.

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16 hours ago, LaPorta said:

Didn’t know you had access to online Pina...I have the real books. Johnny has a good point there. Also try Macintosh Repair and Upgrade Secrets...sometimes I find that one more helpful.

Awesome I found that both cr21 and cr20 are shorted. Thanks I'll get back to both of you when I get it working

 

cap.PNG

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