68kMLA Classic Interface
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| Macintosh Quadra 840av | |
| Posted by: AlpineRaven on 2020-09-27 18:31:28 I have this Quadra 840av board, it isn't working at this stage and I noticed two capacitors are missing on the bottom of the board suspected rough handling. On the underside on the battery end side; C399 C397 Really keen to fix this board up. Does anyone know what voltage/value they would be? Cheers AP | |
| Posted by: Phipli on 2020-10-04 01:34:44 I can confirm they are both fitted to my board but there is no easy way to measure their values without removing them. They're quite inaccessible - behind the plastic board protector. How on earth did they get knocked off? Are you sure that they're not just unpopulated on your board? | |
| Posted by: stormy on 2020-10-04 23:33:52 Here you are, list of all caps: source: http://www.maccaps.com/MacCaps/Capacitor_Reference/Entries/1993/7/29_Quadra_840av.html  | |
| Posted by: stormy on 2020-10-05 19:59:27 I just noticed you might have been referring to the rear of the motherboard.. sorry this is all I can find. | |
Posted by: stormy on 2020-10-05 20:02:00I have this Quadra 840av board, it isn't working at this stageI noticed you don't mention what you've already done. I recommend (if you haven't already) remove all the electrolytic caps, give the board a thorough clean in distilled water and IPA. Clean all vias, chips and sockets. Replace all the capacitors. All of this before worrying about 2 random caps on the back 🙂 Like Phil said, they're probably just unpopulated. | |
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