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Fixing N4006 Monitor

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

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Eric

Well, I am officially stuck.  I put all of the pieces together and unfortunately the monitor is going back into the storage unit to sit.  As you can see in the email below they do not have it in stock or believe that it will ever be back in stock.

I really wish I could find an old-school TV repair person who would be willing to cheaply tinker with the monitor and try to match a similar flyback.

Oh well I tried.  I want to thank everyone who helped as well.
 

barcher174

It's crazy how quick CRT repair became a lost art considering how many years they were in production. If it were me I would keep my eye out for a cosmetically crappy Sony and see if I could do a swap.

Rob Blessin Black Hole

Hello Eric: Apologies , I've been down in bed with Pneumonia since Dec 24,  it came back negative for COVID but I'm not so sure. They wanted to put me in the hospital but I chose to ride it out nd avaoid a huge hospital bill.


So I may have the parts you need here , you are just looking for the flyback transformer for a NeXT Sony Trinitron? I know I have alleast 1 DOA Sony Trinitron Monitor and a box of boards from another one.
I'm finally getting back at it . Let me look at the thread left side board with powersupply .....

Apologies which board am I looking for  :)



Best regards Rob Blessin
Rob Blessin President computerpowwow ebay  [email protected] http://www.blackholeinc.com
303-741-9998 Serving the NeXT Community  since 2/9/93

Eric

Its the main board that connects to the Flyback (the Red wire that connects to the picture tube).  It has lots of wires connecting to it.  Image is attached.  I also want the HSTAT (image of the white block).

Let me know what you can do.  THANK YOU!!!

Eric


Rob Blessin Black Hole

Hello Eric: I'll see what I can do please bear with me the monitor I speak of is in a crawl space, I know it is there ! Best Regards Rob Blessin
Rob Blessin President computerpowwow ebay  [email protected] http://www.blackholeinc.com
303-741-9998 Serving the NeXT Community  since 2/9/93

Eric


zombie

Quote from: Rob Blessin Black Hole on January 13, 2021, 12:42:02 AMHello Eric: Apologies , I've been down in bed with Pneumonia since Dec 24,  it came back negative for COVID but I'm not so sure. They wanted to put me in the hospital but I chose to ride it out nd avaoid a huge hospital bill.



Rob so sorry to hear you've been ill that long. Hoping you fully recover and feel 100% soon.

Eric

Hope everyone had a great Thanksgiving!!  I am trying to re-visit getting this working for the holidays!!  Rob any updates on any extras you might have?  Possibly I will be driving out west during the winter break and can possibly pick stuff up.  Thanks!!
Eric

tt0ny

My N4006 also has this problem. Seeing your determination makes me want to dig my monitor out again.
I have found a services manual here that I would like to try out.

https://elektrotanya.com/sony_gdm-1632.pdf/download.html#dl


tux

Quote from: tt0ny on January 22, 2022, 05:59:16 AMMy N4006 also has this problem. Seeing your determination makes me want to dig my monitor out again.
I have found a services manual here that I would like to try out.

https://elektrotanya.com/sony_gdm-1632.pdf/download.html#dl

I also have an NeXT/Sony N4006 monitor with the same/similar problem.  The picture was poor - distorted colors, uneven brightness, fold-over, etc until I recapped it and now it has no picture.  I still hear the Degauss loop and CRT static charge buildup sounds and see the electron gun filaments glow, but no picture/raster appears even with the contrast and brightness turned up.  One peculiar thing that puzzles me is that it had 2 electrolytic bipolar capacitors that were not listed as such in the GDM-1632 hardware listings. These 25v 22microF capacitors were silk-screened on the little DB board as polarized capacitors (C402 and C418). I replaced them with regular polarized electrolytic caps oriented as shown in the DB board silk-screen and now I get no picture. I'm contemplating putting the original 2 caps back, but not entirely sure that was the reason for the failure.

tt0ny

@TUX    does your screen look like this ?

After replacing a power supply from a Sony GDM-1961 I got this picture. At least it shows a picture on the N4006 for the first time :)

tux

Quote from: tt0ny on February 06, 2022, 10:32:03 AM@TUX    does your screen look like this ?

After replacing a power supply from a Sony GDM-1961 I got this picture. At least it shows a picture on the N4006 for the first time :)

Thanks for the reply.  Before I recapped the boards, the picture was very poor - pretty similar to what you are showing.  After the recapping I've got no picture.  I will try looking at the power supply next.  Thanks for the help.
Tux

barcher174

Yeah I also responded on FB but I think this is a cap issue.

Rob Blessin Black Hole

Quote from: Eric on November 30, 2021, 08:31:08 PMHope everyone had a great Thanksgiving!!  I am trying to re-visit getting this working for the holidays!!  Rob any updates on any extras you might have?  Possibly I will be driving out west during the winter break and can possibly pick stuff up.  Thanks!!
Eric

Hello Eric: I don't know if I replied I got into the dusty crawl space finally and have a box of the boards from the Sony Trintron for you. Apologies for the delay , how about $40 covers shipping , box etc and I'll send you the lot.  According to the my pulmonologist , mri's, ultrasound and the breathing tests in something that looked like a glass phone book, I've lost 25% to 40% of my lung capacity with scaring on 2 to 5% of my lung tissue so weight loss will help and my workout for the day was getting the monitor out , I was hoping it would power on but no luck. The Boards look ok so hopefully they will help , I guess better late than never. :)
Rob Blessin President computerpowwow ebay  [email protected] http://www.blackholeinc.com
303-741-9998 Serving the NeXT Community  since 2/9/93

Eric

#44
Finally got everything to work.  All of the caps I replaced were perfect!!  It was IC101 and IC102 chips in the power supply that was the whole issue.

https://www.digchip.com/datasheets/parts/datasheet/424/IR3M02-pdf.php

http://www.nextcomputers.org/NeXTfiles/Docs/Hardware/sony_gdm-1632.pdf