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Aztec LC PSU still ticking after recap


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#1 CompuNurd

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Posted 11 September 2017 - 04:06 PM

I just recapped an Aztec PSU from a Mac LC, and when I go to turn it on, it just ticks. The solder connections look fine, is there something I am missing?

 

The voltages I am getting are: ~4.5 from the blue wire, ~1.25 from the yellow wire, and ~.60 from the orange wire.



#2 360alaska

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Posted 11 September 2017 - 04:30 PM

Are you plugging it into the board when your testing it? It must be connected to the logic board?



#3 techknight

techknight
  • 68LC040

Posted 11 September 2017 - 09:03 PM

That. and make sure none of your rails are shorted to ground. 

 

Last thing is the optocoupler. 


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#4 CompuNurd

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Posted 11 September 2017 - 10:41 PM

Are you plugging it into the board when your testing it? It must be connected to the logic board?

Yes

 

 

That. and make sure none of your rails are shorted to ground. 

Hmm. All colored wires show continuity with the two black wires. I don't see a solder bridge anywhere....



#5 techknight

techknight
  • 68LC040

Posted 12 September 2017 - 01:40 PM

umm put it on diode check. Red lead on all the rails, 1 by 1, black lead to black. 

 

What are you readings? 


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#6 CompuNurd

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Posted 14 September 2017 - 11:15 PM

What's it supposed to read? My meter has the diode and 2Kohm functions together. When I measure, the reading is ~.200 then rises up to ~1.700, and keeps going.



#7 techknight

techknight
  • 68LC040

Posted 15 September 2017 - 01:01 AM

Then there are no shorts on the rails. 

 

So, as long as the power supply is connected to a load, it should run. You may need to change the opto-coupler. 


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#8 CompuNurd

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Posted 15 September 2017 - 05:20 PM

I have tested the optocoupler and it seems to be fine (unless I tested it wrong?).

 

I guess it never hurts to try. The model is CNX82A, Mouser and Digikey do not stock it, but I found some on eBay.



#9 CompuNurd

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Posted 03 October 2017 - 02:24 PM

The optocoupler seemed to fix it, but there was a humming, presumably from the transformer, and a lifted pad. I don't trust it, so I will be scrapping it.



#10 techknight

techknight
  • 68LC040

Posted 04 October 2017 - 11:15 PM

humming is normal, as long as its soft/subtle, thats the analogous sound of the power supply regulating itself. 


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#11 CompuNurd

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Posted 05 October 2017 - 05:05 AM

It was audible from several feet away. If you want it, I'll send it to you for the cost of shipping, shoot me a PM. Better someone make use of it than it being trashed.






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