68kMLA Classic Interface

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IIci won't start
Posted by: ArmorAlley on 2020-09-20 01:41:37 Hi all, I have a IIci that powers up, in so far as it than fan is on and the little green light in front comes on. It doesn't chime. I replaced the PRAM battery. I tried it with just 4 sticks of RAM, no NuBus cards and the cache card. The same. My question is: is this simply a board that needs a recap or are there any visible signs of permanent damage? There are signs of cap goo up by the sound chips in the upper left of the first picture. Here are some two photos of the motherboard. /monthly_2020_09/large.1363652131_IIciMotherboard1.jpg.413d17fac844d9f8d8370e5d87bf3d17.jpg/monthly_2020_09/large.1288610167_IIciMotherboard2.jpg.0f37b744629a8aeadf2e33dce741b7b4.jpg Thanks for your help aa
Posted by: bibilit on 2020-09-20 02:11:01 There’s goo everywhere. So, as usual, new caps and a good wash.
Posted by: desertrout on 2020-09-20 02:59:13 There’s goo everywhere. So, as usual, new caps and a good wash. +1 After you remove the SMD electrolytics and give it a good scrub, do a close check of traces / continuities around those pads. I just reparied a IIci board that had a half-dozen broken traces, a couple with no obvious sign of corrosion and further away from the caps than I expected -- and your board has more goo than this one did. Pernicious stuff. Good luck! These Mac II's are awesome machines.
Posted by: Elfen on 2020-10-27 21:00:37 I agree on both previous posts - clean the board and recap it. That should fix 95% of all your problems.
Posted by: tt on 2020-11-02 10:41:21 I have the same issue. I just recapped the board but it won't chime. The green LED comes on and the PSU fan is going. Voltages at the HDD power connector seem normal. I didn't think the board looked bad concerning capacitor goo before I cleaned it.
Posted by: Papichulo on 2020-11-11 15:24:59 I have the same issue. I just recapped the board but it won't chime. The green LED comes on and the PSU fan is going. Voltages at the HDD power connector seem normal. I didn't think the board looked bad concerning capacitor goo before I cleaned it. get another board then. or its a bad trace mabie?
Posted by: bibilit on 2020-11-12 07:47:22 UD13 / UE13 (74hc132) are known to be faulty with the same exact issue (top right of the board next to capacitors)
Posted by: miko-Tokyo on 2020-11-23 05:20:23 The capacitor is rust around. You need to remove all capacitors and remove parts of brown and clean up the parts with your toothbrush. When you're clean, you need to order a new parts in digikey and get it. But even if you exchange everything, it doesn't work.
Posted by: miko-Tokyo on 2020-11-23 05:22:18 Correction. There are cases where it doesn't work even if you exchange everything. In this case, we need to doubt the failure of power units.
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