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| Power book 180, power supply making tick tick noise |
Posted by: Maccollector on 2026-02-07 17:44:45
Hi all, I have recently purchased Powerbook 180 without a power supply. I found correct power supply, original apple power supply.Tested the voltage 7.5V but when I tested Amps, it was making tick tick noise before plugging it in the computer. Is this suffice to say i purchased a dead power supply or can I open 1 of these and potentially revive it?
Without correct power supply I have no way if finding out if the Powerbook I bought is functional. Now I have one of those multi plug power supply but this one is 65W, 18.5-20V. Is it safe to try that one or should I keep looking for correct one |
Posted by: luRaichu on 2026-02-07 18:09:25
Now I have one of those multi plug power supply but this one is 65W, 18.5-20V. Is it safe to try that one No. Do not. You can only use 7.5 volts.
How did you measure amperage? tick tick sounds like you're shorting it and it's resetting
If the power supply measures 7.5 volts it should be good just plug it into the PowerBook |
Posted by: Maccollector on 2026-02-07 18:22:29
No. Do not. You can only use 7.5 volts.
How did you measure amperage? tick tick sounds like you're shorting it and it's resetting
If the power supply measures 7.5 volts it should be good just plug it into the PowerBook I used multi meter with black probe on the outside and red on the inside. |
Posted by: luRaichu on 2026-02-07 18:40:09
Yeah uhh that's not how it's done! And not needed here!
You just need to know that the voltage is correct. It seems to be. So chop chop go ahead and plug it in. Drop your hesitations |
Posted by: Maccollector on 2026-02-07 19:00:58
Yeah uhh that's not how it's done! And not needed here!
You just need to know that the voltage is correct. It seems to be. So chop chop go ahead and plug it in. Drop your hesitations I went and did that and power supply is making tick tick noise, no life out of the book. Time to open it and see how many stand offs are broken |
Posted by: luRaichu on 2026-02-07 19:22:52
This is where a benchtop power supply would come in handy...
Your profile says you're from Australia, so I would assume your PowerBook power supply would be different from the ones I've had here in the land of the free |
Posted by: Maccollector on 2026-02-07 19:54:55
This is where a benchtop power supply would come in handy...
Your profile says you're from Australia, so I would assume your PowerBook power supply would be different from the ones I've had here in the land of the free yes it would be. I am guessing these is a short on the board. What I did not mention that battery leaked, however it did not seem to have transferred to the board ( yet to be seen) |
Posted by: 3lectr1cPPC on 2026-02-07 23:40:00
The 100 series 2 amp power supplies have bad leaky caps 100% of the time. Bust it open, analyze the damage, and get recapping. |
Posted by: Maccollector on 2026-02-08 00:27:36
The 100 series 2 amp power supplies have bad leaky caps 100% of the time. Bust it open, analyze the damage, and get recapping. Mine is 3A but again 100 series. |
Posted by: Maccollector on 2026-02-08 00:30:42
And laptop is open.. still has original appl 2.5’ 20MB drive. Now to see where is the power not going, considering my psu is ok. |
Posted by: 3lectr1cPPC on 2026-02-08 00:40:12
Mine is 3A but again 100 series. These aren’t as bad but still have cap issues. Have you for sure validated that it’s outputting 7.5V? |
Posted by: Maccollector on 2026-02-08 00:41:01
Where can i buy these??? This one was corroded legs broke off |
Posted by: Maccollector on 2026-02-08 01:00:02
These aren’t as bad but still have cap issues. Have you for sure validated that it’s outputting 7.5V? Black probe on the outside , red inside the jack and I get 7.76v
Now these two babies get really hot but no voltage reaches them ...what are they |
Posted by: Maccollector on 2026-02-08 01:36:43
These aren’t as bad but still have cap issues. Have you for sure validated that it’s outputting 7.5V? Black probe on the outside , red inside the jack and I get 7.76v
Now these two babies get really hot but no voltage reaches them ...what are rhey |
Posted by: Maccollector on 2026-02-08 01:38:14
Also this part is getting hot too , what is it ... Diode???? |
Posted by: bibilit on 2026-02-08 03:16:49
D is usually a diode |
Posted by: Maccollector on 2026-02-08 04:19:15
D is usually a diode thank you..how do I find the values? By searching "KW" |
Posted by: croissantking on 2026-02-08 04:34:09
Also this part is getting hot too , what is it ... Diode???? Protection diode, very common failure part in these models - they short and prevent power-on. From what others have said on the forums, and my own experience, it’s safe to remove it and try powering on without it there (but plan to replace it soon). The exact value I’m sure has been stated here in the past, but I didn’t take a note of it. Likely the letters on the top are a code that could help identify it. |
Posted by: croissantking on 2026-02-08 06:55:58
Now these two babies get really hot but no voltage reaches them ...what are they Those are inductors - for removing noise from the 5V rail. |
Posted by: luRaichu on 2026-02-08 09:20:38
Where can i buy these??? This one was corroded legs broke off I looked on DigiKey and none of their 8 pin mini DIN sockets use this staggered pin footprint?
Also I have some PowerBook parts for sale if you need any
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