Ah, okay. That helps; It doesn't even chime, so I guess that means the
capacitors are bad. They looked fine, so I guessed that they were OK.
Is there another way to tell which ones are bad? I don't have an ESR meter...
Can you tell by looking, or with a volt-meter? Would it be best just to replace
them all?
In that case, where's a good source to get the right capacitors? I'm sure
there's tons of places online, but if anyone has recommendations for good
price, and good quality, that would be great! Thanks,
-Elliott Price
Quoit - Macintosh Computer Services
hobbittech.com/quoit
On May 24, 2010, at 8:37 PM, Ryan C. Underwood wrote:
>
> They can be tested in-circuit with an ESR meter. The sound you describe
> is a typical failure mode of any switch-mode power supply. I have never
> run into a bad flyback that prevented the power supply from running,
> though I'm sure it's possible. All the bad flybacks I ever had caused
> focus/stability problems, acrid smell, etc.
>
> On Mon, May 24, 2010 at 08:23:36PM -0700, Elliott Price wrote:
>> Ah, that could well be the case. How can you tell which one(s) are bad? Is
>> there a way to tell for sure if it is the flyback, or the capacitors? Thanks,
>>
>>
>> -Elliott Price
>>
>> Quoit - Macintosh Computer Services
>> hobbittech.com/quoit
>>
>> On May 24, 2010, at 4:44 PM, Ryan C. Underwood wrote:
>>
>>>
>>> If the clicking is rhythmic, and nothing else happens, it is more likely
>>> that you have dried up capacitors on the analog board that are
>>> preventing the power supply from coming up.
>>>
>>> On Mon, May 24, 2010 at 03:10:36PM -0700, Elliott Price wrote:
>>>> I have a Mac Plus that I'm pretty sure has a bad flyback transformer. When
>>>> you flip the switch, it makes a sort of rhythmic clicking, and nothing
>>>> else happens. I opened it up, and the flyback has white and brown residue
>>>> on it in certain areas.
>>>> Can you get new transformers? If so, where could I get one? Or is it
>>>> better to just get a new analog board? How hard is it to replace the
>>>> transformer? It looks easy enough to de-dsolder and then drop in a new
>>>> one. Are there any precautions to take to make sure it's fully discharged?
>>>> Thanks,
>>>>
>>>>
>>>> -Elliott Price
>>>>
>>>> Quoit - Macintosh Computer Services
>>>> hobbittech.com/quoit
>>>>
>>>> --
>>>> -----
>>>> 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 [email protected]
>>>> To leave this group, send email to
>>>> [email protected]
>>>> For more options, visit this group at
>>>> http://groups.google.com/group/vintage-macs
>>>>
>>>> Support for older Macs: http://lowendmac.com/services/
>>>>
>>>
>>> --
>>> Ryan C. Underwood
>>> runderwo(at)mail.win.org
>>>
>>> --
>>> -----
>>> 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 [email protected]
>>> To leave this group, send email to [email protected]
>>> 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 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 [email protected]
>> To leave this group, send email to [email protected]
>> For more options, visit this group at
>> http://groups.google.com/group/vintage-macs
>>
>> Support for older Macs: http://lowendmac.com/services/
>>
>
> --
> Ryan C. Underwood
> runderwo(at)mail.win.org
>
> --
> -----
> 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 [email protected]
> To leave this group, send email to [email protected]
> 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 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 [email protected]
To leave this group, send email to [email protected]
For more options, visit this group at
http://groups.google.com/group/vintage-macs
Support for older Macs: http://lowendmac.com/services/
