I have a NeXT Monitor N4006 which automatically powers down ( green LED goes off ) after around 30-40 seconds of switching on.
I understand that this is because cathode ray tube over-voltage has been detected so powers down to prevent x-ray exposure to operator. Either the low voltage circuit is broken and generating too many volts or the step-up from low-voltage to 24 thousands volt circuit is broken or the detection circuit itself is broken and all most likely caused by 15 year old failed electrolytic capacitor(s). Was working OK around a year ago when I last switched on.
Anyone know where I can locate the schematic as extensive googling has not uncovered one ?
Regards
Caz
I can't be of direct assistance, but I'm thinking the N4006 has the same internals as many of the other workstation monitors of the era from Sun, IBM, and SGI.
If you've got the case opened, there should be a Sony part number to go by.
Not exact, but as an example, this popped up in a few minutes of searching using "GDM-17E10":
http://www.anatekcorp.com/faq/archmntr-1.htmQuote
QUESTION NO. P39-8: Dell D2026ths monitor (crosses to Sony GDM20e03), has no video and no high voltage. The tube does not light up at all but the green light stays on and has good power draw. I had the monitor working once, was letting bench test picture started to flicker then went out. I have not been able to get the video back since.
A: Try checking for any cracked connections around the flyback on the G board. Also might check C677, C683, and IC603 while there.
This is a problem for my N4006 as well. When you push the switch it comes on with a nice THNMMMM degaussing noise. But it turns itself off after about 10 seconds, and the green light goes out. If you toggle the power switch it does nothing unless you leave it for a few minutes between tries, but then you get the same performance, light comes on five seconds later it goes out again.. :(
I only got it on Sat! The previous owner had it working in the morning, but it was dead when I got it home. Mind you the state of the roads 'round here the trip probably shook something important loose. Forgot how heavy these thing are, even though it's only 17" you can do you back in lifting it.