NeXT Cube - powers on briefly then off again

[Toby Thain]

On 2015-10-25 7:21 PM, Ian Finder wrote:
> I would replace the electrolytic capacitors in the power supply before going further.
>

Well, the problem disappears with the standard setup. You still think 
caps could be at issue with the splitter setup? What's your detailed 
thinking?

--Toby

> Sent from my iPhone
>
>> On Oct 25, 2015, at 15:38, Toby Thain <toby at telegraphics.com.au> wrote:
>>
>>> On 2015-10-25 5:28 PM, Toby Thain wrote:
>>> Hi,
>>>
>>> After a few years I wanted to try my Cube with the soundbox/VGA splitter
>>> configuration for the first time. (I have the fading phosphor N4000A so
>>> have been keen to have an alternate video solution.)
>>>
>>> However, all is not well. Using the keyboard power button, the machine
>>> powers on for a couple of seconds, just long enough to see a NeXT logo
>>> and grey desktop on the VGA (yay!) but then powers itself off again.
>>
>>
>> I did the obvious thing and tested it with a standard monitor and cable and everything is okay. So the problem must exist with the splitter/soundbox setup. Soft power signals?
>>
>> Any suggestions welcome.
>>
>> --Toby
>>
>>> Any clues?
>>>
>>> Thanks in advance
>>>
>>> --Toby
>>> (not having a good classic computing week)
>>
>