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Fixing N4006 Monitor

Started by Eric, December 01, 2020, 08:31:18 PM

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Eric

Hello Everyone,

Since being unemployed for sometime now I have free time to tinker.  Fixed multiple machines, Altair, SWTP, etc.  Now I am working on monitors.  I have completely disassembled all of the circuit boards from the N4006 and will replace all of the CAPS which I believe is causing the monitor to power down as soon as it starts up. 

Here are some images.  Just getting started.


Eric

More Images


Eric

More Images

Eric

More Images

Eric

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Eric

More Images

stepleton

Back in the early 2000s I had such a monitor, and it had the same problem. I remember finding a FAQ or a newsgroup/forum post somewhere saying that this particular model (which was used with a variety of Unix workstations, I think -- the N4006 was just a black-case version made for NeXT) had some particular part that needed to be replaced. The part wasn't a capacitor, I don't think.

I don't recall what it was that failed, but this thread about a different Trinitron (found by Googling "trinitron monitor turns itself off" matches my dim memory:
http://www.videokarma.org/archive/index.php/t-57097.html

Eric

I will replace all of the CAPS and the HSTAT device.  Here is the image of the device.

1-237-344-11 High voltage resistor assembly

You can order it from here:
https://sony.encompass.com/item/543667/Sony/1-237-344-11/


Eric

#8
Also here is the list of ALL Capacitors that I removed from the monitor.  I removed ALL Electrolytic caps.  Many of them were leaking of have leaked out.  Will compile this list in an excel sheet soon but here it is.  All values are in micro farad (uF) and all are Radial capacitors (have two leads which stick out from the bottom of the capacitor). One page at a time because of the size limit for images.

All caps ordered via Mouser except the 2) 250V 820UF that was Amazon.  See attached.


I included the written images and now the excel sheet showing all of the values.  Here is the breakdown.  (Number of units) Voltage uF

1) 50V 0.47UF

10) 50V 1UF
4) 160V 1UF

4) 50V 2.2UF
3) 100V 2.2UF
1) 400V 2.2UF

1) 25V 4.7UF
6) 50V 4.7UF

3) 16V 10UF
12) 50V 10UF
1) 160V 10UF

3) 25V 22UF
1) 160V 22UF

1) 50V 33UF
3) 160V 33UF

13) 16V 47UF
5) 50V 47UF

4) 10V 100UF
9) 16V 100UF
5) 25V 100UF
2) 80V 100UF

4) 35V 220UF
1) 400V 220UF

1) 6.3V 330UF

1) 10V 470UF
1) 16V 470UF

2) 250V 820UF

2) 16V 1000UF
2) 25V 1000UF
4) 35V 1000UF

Eric

#9
Caps page 2 plus Mouser parts list

Eric

Caps Page 3

Eric

Caps Page 4

Eric

Caps Page 5

Eric

Caps Page 6 and 7 (FINAL)

Eric

Sony Manual that matches the N4006.  The schematics match my monitor.  Many of the caps do not match the listings so I am going with what I pulled out.

GDM-1601_Service_Manual_1988
http://www.bitsavers.org/pdf/sony/monitor/GDM-1601/GDM-1601_Service_Manual_1988.pdf

I would download this and save it!!!  Tried to upload but it is to large.