Megalextoria
Retro computing and gaming, sci-fi books, tv and movies and other geeky stuff.

Home » Digital Archaeology » Computer Arcana » Apple » Vintage Macs Group » PSU failure on 8100
Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend 
Switch to threaded view of this topic Create a new topic Submit Reply
PSU failure on 8100 [message #338510] Sun, 26 February 2017 19:54 Go to next message
Alex Ander is currently offline  Alex Ander
Messages: 17
Registered: February 2017
Karma: 0
Junior Member
So I just plugged in a 8100 that is 20 years old. POP goes the PSU. A few
bang noises very very little smoke.
I guess repairing these isn't worth it.
If I want to get a replacement from a PC, what would I be looking for?
The PSU in the machine is a Delta Electronics DPS-225AB

--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

RE: PSU failure on 8100 [message #338511 is a reply to message #338510] Sun, 26 February 2017 20:26 Go to previous messageGo to next message
Wesley Furr is currently offline  Wesley Furr
Messages: 79
Registered: September 2012
Karma: 0
Member
Don't know much about that series of Mac...but in looking online, doesn't
look like it is a stock standard type (AT/ATX/etc) power supply. May be
able to re-wire an ATX power supply, though the power-on part might be a
challenge. Probably worth pulling the cover off and having a look inside -
could just be a blown capacitor or something easily replaced.

Wesley


_____

From: vintage-macs@googlegroups.com [mailto:vintage-macs@googlegroups.com]
On Behalf Of Alex Ander
Sent: Sunday, February 26, 2017 7:55 PM
To: Vintage Macs
Subject: PSU failure on 8100


So I just plugged in a 8100 that is 20 years old. POP goes the PSU. A few
bang noises very very little smoke.
I guess repairing these isn't worth it.
If I want to get a replacement from a PC, what would I be looking for?
The PSU in the machine is a Delta Electronics DPS-225AB


--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: PSU failure on 8100 [message #338512 is a reply to message #338511] Sun, 26 February 2017 20:28 Go to previous messageGo to next message
Alex Ander is currently offline  Alex Ander
Messages: 17
Registered: February 2017
Karma: 0
Junior Member
Thanks, that's an option as well, although I don't have too much experience
with opening PSUs
I will completely remove it and open it, I'll share a pic here If you guys
want.

On Mon, Feb 27, 2017 at 3:26 AM, Wesley Furr <wesley@megley.com> wrote:

> Don't know much about that series of Mac...but in looking online, doesn't
> look like it is a stock standard type (AT/ATX/etc) power supply. May be
> able to re-wire an ATX power supply, though the power-on part might be a
> challenge. Probably worth pulling the cover off and having a look inside -
> could just be a blown capacitor or something easily replaced.
>
> Wesley
>
>
> ------------------------------
> *From:* vintage-macs@googlegroups.com [mailto:vintage-macs@
> googlegroups.com] *On Behalf Of *Alex Ander
> *Sent:* Sunday, February 26, 2017 7:55 PM
> *To:* Vintage Macs
> *Subject:* PSU failure on 8100
>
> So I just plugged in a 8100 that is 20 years old. POP goes the PSU. A few
> bang noises very very little smoke.
> I guess repairing these isn't worth it.
> If I want to get a replacement from a PC, what would I be looking for?
> The PSU in the machine is a Delta Electronics DPS-225AB
>
> --
> --
> -----
> You received this message because you are a member of the Vintage Macs
> group.
> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our
> netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
> To post to this group, send email to vintage-macs@googlegroups.com
> To leave this group, send email to vintage-macs+unsubscribe@
> googlegroups.com
> For more options, visit this group at http://groups.google.com/
> group/vintage-macs
>
> Support for older Macs: http://lowendmac.com/services/
> ---
> You received this message because you are subscribed to the Google Groups
> "Vintage Macs" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to vintage-macs+unsubscribe@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>

--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

RE: PSU failure on 8100 [message #338513 is a reply to message #338512] Sun, 26 February 2017 20:44 Go to previous messageGo to next message
Wesley Furr is currently offline  Wesley Furr
Messages: 79
Registered: September 2012
Karma: 0
Member
They're all different, but shouldn't be too difficult. May be able to see
what is going on without totally tearing it apart.

Wesley


_____

From: vintage-macs@googlegroups.com [mailto:vintage-macs@googlegroups.com]
On Behalf Of Alexander
Sent: Sunday, February 26, 2017 8:28 PM
To: vintage-macs@googlegroups.com
Subject: Re: PSU failure on 8100


Thanks, that's an option as well, although I don't have too much experience
with opening PSUs

I will completely remove it and open it, I'll share a pic here If you guys
want.


On Mon, Feb 27, 2017 at 3:26 AM, Wesley Furr <wesley@megley.com> wrote:



Don't know much about that series of Mac...but in looking online, doesn't
look like it is a stock standard type (AT/ATX/etc) power supply. May be
able to re-wire an ATX power supply, though the power-on part might be a
challenge. Probably worth pulling the cover off and having a look inside -
could just be a blown capacitor or something easily replaced.

Wesley


_____

From: vintage-macs@googlegroups.com [mailto:vintage-macs@
<mailto:vintage-macs@googlegroups.com> googlegroups.com] On Behalf Of Alex
Ander
Sent: Sunday, February 26, 2017 7:55 PM
To: Vintage Macs
Subject: PSU failure on 8100


So I just plugged in a 8100 that is 20 years old. POP goes the PSU. A few
bang noises very very little smoke.
I guess repairing these isn't worth it.
If I want to get a replacement from a PC, what would I be looking for?
The PSU in the machine is a Delta Electronics DPS-225AB






--
--
-----
You received this message because you are a member of the Vintage Macs
group.
The list FAQ is at http://lowendmac.com/lists/
<http://lowendmac.com/lists/vintagemacs.shtml> vintagemacs.shtml and our
netiquette guide is at http://www.lowendmac.com/
<http://www.lowendmac.com/lists/netiquette.shtml> lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@
<mailto:vintage-macs%2Bunsubscribe@googlegroups.com> googlegroups.com
For more options, visit this group at http://groups.google.com/
<http://groups.google.com/group/vintage-macs> group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups
"Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an
email to vintage-macs+unsubscribe@
<mailto:vintage-macs+unsubscribe@googlegroups.com> googlegroups.com.
For more options, visit https://groups.google.com/d/
<https://groups.google.com/d/optout> optout.



--
--
-----
You received this message because you are a member of the Vintage Macs
group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our
netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups
"Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an
email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: PSU failure on 8100 [message #338523 is a reply to message #338513] Mon, 27 February 2017 06:31 Go to previous messageGo to next message
vintage-macs is currently offline  vintage-macs
Messages: 425
Registered: April 2014
Karma: 0
Senior Member
Alex,
It's more likely to be failed electrolytic capacitors - it's a common problem with old machines. If you are in the United States, head over to Maccaps.com and Charles Phillips can repair it for you.
Even with my background in electronic engineering, the first time I opened a faulty Mac, replaced the capacitors and heard it chime into life, I was speechless.
Charles is an expert when it comes to capacitors and repair work.
Of course, if you happen to live elsewhere, a local TV repair shop or electronics repair shop could do the same job for you but they might charge you more.
It might be less expensive to get another PSU off eBay but then you canot be sure that it will work flawlessly if the capacitors have not been replaced. It is only a matter of time before they fail.
At least if you get the original PSU repaired, you know that it will fit into the case again.
All the best,
Keith


From: Wesley Furr <wesley@megley.com>
To: vintage-macs@googlegroups.com
Sent: Monday, 27 February 2017, 1:44
Subject: RE: PSU failure on 8100

They're all different, but shouldn't be too difficult.  May be able to see what is going on without totally tearing it apart. Wesley 
From: vintage-macs@googlegroups.com [mailto:vintage-macs@googlegroups.com] On Behalf Of Alexander
Sent: Sunday, February 26, 2017 8:28 PM
To: vintage-macs@googlegroups.com
Subject: Re: PSU failure on 8100

Thanks, that's an option as well, although I don't have too much experience with opening PSUs
I will completely remove it and open it, I'll share a pic here If you guys want.

On Mon, Feb 27, 2017 at 3:26 AM, Wesley Furr <wesley@megley.com> wrote:

Don't know much about that series of Mac...but in looking online, doesn't look like it is a stock standard type (AT/ATX/etc) power supply.  May be able to re-wire an ATX power supply, though the power-on part might be a challenge.  Probably worth pulling the cover off and having a look inside - could just be a blown capacitor or something easily replaced.   Wesley  
From: vintage-macs@googlegroups.com [mailto:vintage-macs@ googlegroups.com] On Behalf Of Alex Ander
Sent: Sunday, February 26, 2017 7:55 PM
To: Vintage Macs
Subject: PSU failure on 8100

So I just plugged in a 8100 that is 20 years old. POP goes the PSU. A few bang noises very very little smoke.
I guess repairing these isn't worth it.
If I want to get a replacement from a PC, what would I be looking for?
The PSU in the machine is a Delta Electronics DPS-225AB
--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/ vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/ lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@ googlegroups.com
For more options, visit this group at http://groups.google.com/ group/vintage-macs
 
Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@ googlegroups.com.
For more options, visit https://groups.google.com/d/ optout.


--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs
 
Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs
 
Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.




--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: PSU failure on 8100 [message #338529 is a reply to message #338523] Mon, 27 February 2017 08:55 Go to previous messageGo to next message
Robert Hesson is currently offline  Robert Hesson
Messages: 76
Registered: January 2013
Karma: 0
Member
What you are describing is capacitors detonating which is common for old PSU's and surprisingly cheap to fix. I would look up maccaps.com (I've used him- great work from a great knowledgeable guy) or if you have a local electronics guy he can take care of it too. I recently had to have a power supply for a old PC recapped that ran a proprietary water jet machine and it cost me $15. (A Mac will cost you more...) Not bad to get a $250,000 machine back up and running.

Also, if the caps in the PSU are going, the caps on the logic board are going too. Mac caps did my centris pretty inexpensively and it works great (after my power supply was recapped..)

I learned video editing on an 8100/80 back in the day so that machine holds a special place in memory for me. Good luck.

Sent from my iPhone

> On Feb 27, 2017, at 5:31 AM, 'Keith Jamison' via Vintage Macs <vintage-macs@googlegroups.com> wrote:
>
> Alex,
>
> It's more likely to be failed electrolytic capacitors - it's a common problem with old machines. If you are in the United States, head over to Maccaps.com and Charles Phillips can repair it for you.
>
> Even with my background in electronic engineering, the first time I opened a faulty Mac, replaced the capacitors and heard it chime into life, I was speechless.
>
> Charles is an expert when it comes to capacitors and repair work.
>
> Of course, if you happen to live elsewhere, a local TV repair shop or electronics repair shop could do the same job for you but they might charge you more.
>
> It might be less expensive to get another PSU off eBay but then you canot be sure that it will work flawlessly if the capacitors have not been replaced. It is only a matter of time before they fail.
>
> At least if you get the original PSU repaired, you know that it will fit into the case again.
>
> All the best,
>
> Keith
>
>
> From: Wesley Furr <wesley@megley.com>
> To: vintage-macs@googlegroups.com
> Sent: Monday, 27 February 2017, 1:44
> Subject: RE: PSU failure on 8100
>
> They're all different, but shouldn't be too difficult. May be able to see what is going on without totally tearing it apart.
>
> Wesley
>
>
> From: vintage-macs@googlegroups.com [mailto:vintage-macs@googlegroups.com] On Behalf Of Alexander
> Sent: Sunday, February 26, 2017 8:28 PM
> To: vintage-macs@googlegroups.com
> Subject: Re: PSU failure on 8100
>
> Thanks, that's an option as well, although I don't have too much experience with opening PSUs
> I will completely remove it and open it, I'll share a pic here If you guys want.
>
> On Mon, Feb 27, 2017 at 3:26 AM, Wesley Furr <wesley@megley.com> wrote:
> Don't know much about that series of Mac...but in looking online, doesn't look like it is a stock standard type (AT/ATX/etc) power supply. May be able to re-wire an ATX power supply, though the power-on part might be a challenge. Probably worth pulling the cover off and having a look inside - could just be a blown capacitor or something easily replaced.
>
> Wesley
>
>
> From: vintage-macs@googlegroups.com [mailto:vintage-macs@ googlegroups.com] On Behalf Of Alex Ander
> Sent: Sunday, February 26, 2017 7:55 PM
> To: Vintage Macs
> Subject: PSU failure on 8100
>
> So I just plugged in a 8100 that is 20 years old. POP goes the PSU. A few bang noises very very little smoke.
> I guess repairing these isn't worth it.
> If I want to get a replacement from a PC, what would I be looking for?
> The PSU in the machine is a Delta Electronics DPS-225AB
> --
> --
> -----
> You received this message because you are a member of the Vintage Macs group.
> The list FAQ is at http://lowendmac.com/lists/ vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/ lists/netiquette.shtml
> To post to this group, send email to vintage-macs@googlegroups.com
> To leave this group, send email to vintage-macs+unsubscribe@ googlegroups.com
> For more options, visit this group at http://groups.google.com/ group/vintage-macs
>
> Support for older Macs: http://lowendmac.com/services/
> ---
> You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@ googlegroups.com.
> For more options, visit https://groups.google.com/d/ optout.
>
>
> --
> --
> -----
> You received this message because you are a member of the Vintage Macs group.
> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
> To post to this group, send email to vintage-macs@googlegroups.com
> To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
> For more options, visit this group at http://groups.google.com/group/vintage-macs
>
> Support for older Macs: http://lowendmac.com/services/
> ---
> You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
> --
> --
> -----
> You received this message because you are a member of the Vintage Macs group.
> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
> To post to this group, send email to vintage-macs@googlegroups.com
> To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
> For more options, visit this group at http://groups.google.com/group/vintage-macs
>
> Support for older Macs: http://lowendmac.com/services/
> ---
> You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>
>
> --
> --
> -----
> You received this message because you are a member of the Vintage Macs group.
> The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
> To post to this group, send email to vintage-macs@googlegroups.com
> To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
> For more options, visit this group at http://groups.google.com/group/vintage-macs
>
> Support for older Macs: http://lowendmac.com/services/
> ---
> You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.

--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: PSU failure on 8100 [message #338530 is a reply to message #338529] Mon, 27 February 2017 09:29 Go to previous messageGo to next message
vintage-macs is currently offline  vintage-macs
Messages: 425
Registered: April 2014
Karma: 0
Senior Member
Alex, adding to what Robert has said, Charles at Maccaps.com doesn't use bulk-buy low quality capacitors which can also give you problems due to poor quality control during manufacturing.
At Maccaps, they use branded capacitors, with specific values to cover or exceed the original specification of the PSU. The original caps may be rated to 85 degress centigrade but modern caps are rated to 105 degrees so will last longer.

That's essentially what has happened inside your PSU. It heats up and causes the semi-liquid electrolyte to eventually become dried up. This changes the values of the capacitors so that they no longer function as required and your PSU stops working.
Sometimes, as the capacitors are being heated, they boil what little is left of the electrolyte and you hear a pop. a little bit of smoke may escape from the case and this is also the remains of the electrolyte.
As well as meeting the voltage and capacitance values, another important factor in PSUs is ESR and leakage - that's electrical leakage. Capacitors can be likened to batteries in that they store a charge and release it at a set rate in a set time. If you have batteries stored in a cabinet for years and they are three years past their USE BY date, chances are the electrical charge in the battery has dropped below the required level and you will find they no longer work or they only work for a short period of time. A PSU needs to release the charge from the capacitor at a certain rate to ensure a smooth voltage output to power the logic circuits and the power circuits.

The other problem is that over time, the electrolyte in the PSU will leak as it heats up and it will leak out of the aluminum can. The electrolyte is corrosive and will eventually damage thin circuit tracks on the logic board. It will also cause a short circuit between tracks as it is partially conductive. This leads to other problems.

As part of the capacitor replacement service, maccaps.com clean the boards thoroughly to remove any contaminants such as old electrolyte to ensure that the board works correctly.
Here is a link (it's for a Dell PSU but it will give you an idea about what is going on): Dell Inspiron 530 Power Supply Repair Capacitors

|
|
|
| | |

|

|
|
| |
Dell Inspiron 530 Power Supply Repair Capacitors
quick and dirty partial recap | |

|

|


hope this helps,
Keith

From: Robert Hesson <rhesson82@gmail.com>
To: vintage-macs@googlegroups.com
Sent: Monday, 27 February 2017, 13:55
Subject: Re: PSU failure on 8100

What you are describing is capacitors detonating which is common for old PSU's and surprisingly cheap to fix. I would look up maccaps.com (I've used him- great work from a great knowledgeable guy) or if you have a local electronics guy he can take care of it too. I recently had to have a power supply for a old PC recapped that ran a proprietary water jet machine and it cost me $15. (A Mac will cost you more...) Not bad to get a $250,000 machine back up and running.
Also, if the caps in the PSU are going, the caps on the logic board are going too. Mac caps did my centris pretty inexpensively and it works great (after my power supply was recapped..)
I learned video editing on an 8100/80 back in the day so that machine holds a special place in memory for me.  Good luck.
Sent from my iPhone
On Feb 27, 2017, at 5:31 AM, 'Keith Jamison' via Vintage Macs <vintage-macs@googlegroups.com> wrote:


Alex,
It's more likely to be failed electrolytic capacitors - it's a common problem with old machines. If you are in the United States, head over to Maccaps.com and Charles Phillips can repair it for you.
Even with my background in electronic engineering, the first time I opened a faulty Mac, replaced the capacitors and heard it chime into life, I was speechless.
Charles is an expert when it comes to capacitors and repair work.
Of course, if you happen to live elsewhere, a local TV repair shop or electronics repair shop could do the same job for you but they might charge you more.
It might be less expensive to get another PSU off eBay but then you canot be sure that it will work flawlessly if the capacitors have not been replaced. It is only a matter of time before they fail.
At least if you get the original PSU repaired, you know that it will fit into the case again.
All the best,
Keith


From: Wesley Furr <wesley@megley.com>
To: vintage-macs@googlegroups.com
Sent: Monday, 27 February 2017, 1:44
Subject: RE: PSU failure on 8100

They're all different, but shouldn't be too difficult.  May be able to see what is going on without totally tearing it apart. Wesley 
From: vintage-macs@googlegroups.com [mailto:vintage-macs@googlegroups.com] On Behalf Of Alexander
Sent: Sunday, February 26, 2017 8:28 PM
To: vintage-macs@googlegroups.com
Subject: Re: PSU failure on 8100

Thanks, that's an option as well, although I don't have too much experience with opening PSUs
I will completely remove it and open it, I'll share a pic here If you guys want.

On Mon, Feb 27, 2017 at 3:26 AM, Wesley Furr <wesley@megley.com> wrote:

Don't know much about that series of Mac...but in looking online, doesn't look like it is a stock standard type (AT/ATX/etc) power supply.  May be able to re-wire an ATX power supply, though the power-on part might be a challenge.  Probably worth pulling the cover off and having a look inside - could just be a blown capacitor or something easily replaced.   Wesley  
From: vintage-macs@googlegroups.com [mailto:vintage-macs@ googlegroups.com] On Behalf Of Alex Ander
Sent: Sunday, February 26, 2017 7:55 PM
To: Vintage Macs
Subject: PSU failure on 8100

So I just plugged in a 8100 that is 20 years old. POP goes the PSU. A few bang noises very very little smoke.
I guess repairing these isn't worth it.
If I want to get a replacement from a PC, what would I be looking for?
The PSU in the machine is a Delta Electronics DPS-225AB
--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/ vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/ lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@ googlegroups.com
For more options, visit this group at http://groups.google.com/ group/vintage-macs
 
Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@ googlegroups.com.
For more options, visit https://groups.google.com/d/ optout.


--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs
 
Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs
 
Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.


--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs
 
Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs
 
Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.




--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: PSU failure on 8100 [message #338572 is a reply to message #338530] Mon, 27 February 2017 21:18 Go to previous messageGo to next message
Alex Ander is currently offline  Alex Ander
Messages: 17
Registered: February 2017
Karma: 0
Junior Member

Thank you all for the great help!
I will take it to an electronics store as I am not comfortable working with
the PSU.

--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: PSU failure on 8100 [message #338587 is a reply to message #338530] Tue, 28 February 2017 01:46 Go to previous message
vintage-macs is currently offline  vintage-macs
Messages: 425
Registered: April 2014
Karma: 0
Senior Member
Sometimes with a loud BANG, a blue flash, a curl of smoke and miniature shrapnel all over the place. That usually only happens when the pressure relief (the X or K stamped into the top) fails to burst and either the electrodes inside a capacitor short together or some other component has failed and allowed higher current or voltage to hit the capicitor.



From: 'Keith Jamison' via Vintage Macs <vintage-macs@googlegroups.com>
To: "vintage-macs@googlegroups.com" <vintage-macs@googlegroups.com>
Sent: Monday, February 27, 2017 7:29 AM
Subject: Re: PSU failure on 8100

Sometimes, as the capacitors are being heated, they boil what little is left of the electrolyte and you hear a pop. a little bit of smoke may escape from the case and this is also the remains of the electrolyte.



--
--
-----
You received this message because you are a member of the Vintage Macs group.
The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to vintage-macs@googlegroups.com
To leave this group, send email to vintage-macs+unsubscribe@googlegroups.com
For more options, visit this group at http://groups.google.com/group/vintage-macs

Support for older Macs: http://lowendmac.com/services/
---
You received this message because you are subscribed to the Google Groups "Vintage Macs" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

  Switch to threaded view of this topic Create a new topic Submit Reply
Previous Topic: SCSI2SD
Next Topic: Printer woes (OT?)
Goto Forum:
  

-=] Back to Top [=-
[ Syndicate this forum (XML) ] [ RSS ] [ PDF ]

Current Time: Wed Jul 06 06:10:56 EDT 2022

Total time taken to generate the page: 0.00853 seconds