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Fixing N4006 Monitor

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

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Eric

All original caps have been de-soldered.  I keep all of the old CAPS and the bag the boards with the caps so I can compare if needed to the new caps. 

Eric


Eric

Just a quick update.  Received all of the CAPS except two values that should be here later this week.  Everything else is soldered in.  Here are some images of everything completed.  Once the final caps come in I will get it assembled again for testing.

Eric

More images

Eric

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Eric

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Eric

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Eric

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Eric

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Eric

Well, I got everything back together and powered it up.  The good news is that the green light stays on the bad news is that I get nothing on the screen.  I do not get any static charge on the front of the screen during power up or down.  Not sure what is wrong.  I left the original HSTAT device and have not ordered another one yet. 

Anyone have this issue?

Rob Blessin Black Hole

Hello Eric: Excellent effort .... I currently do not have any working Sony Trinitrons in stock. 

I have some of the internal boards for them condition unknown $20 each.

I uploaded the service doc here : http://www.nextcomputers.org/NeXTfiles/Docs/Hardware/

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

Eric

Help Please ---

I drove the monitor to a old-time TV repair place about 100 miles from my house.  For $50 he spent about a couple of hours looking for issues and determined that:

1) The correct power is going into the Flyback but the Flyback is not putting out the correct High Voltage. 

He suspects that the flyback was damaged when the power supply caps eroded.  So I am trying to find the flyback.  The markings say: 1-439-533-11.

I have searched and searched and every site that sells flybacks says no longer stocked and no replacement.

So, does anyone know what can be used as a replacement?  I have spent considerable time replacing all of the caps and I would hate for this to be the final part that keeps it in its COMA.

Also I have a place about 43 miles from my house that sells all types of Flyback's but they do not have mine. 

Here is the list of flybacks they do have.  Does anyone know if 1-439-533-11 can be swapped with one of the ones below?

Theta-K7

Have a look at https://www.scribd.com/document/355145230/164013634-Listado-de-Fly-Back-s-Inverso-HR

If you trust that table (which I make no claims is accurate, as I know nothing of the source), an HR Diemen 80097 should be a replacement.  I've never worked on a NeXT monitor, but I have installed HR Diemen flybacks in a couple of other monitors and have found them to be good.

I have purchased them from Dönberg Electronics in Ireland (https://www.donberg.ie/), and while they do not list this particular HR Diemen on their website, they are a very friendly and helpful shop, so you might enquire anyway.  They are also quite knowledgeable and may be able to guide you toward an alternative replacement.

Eric

Thank you for this information.  I went to the website and did a cross reference and it comes back with something else????

HR 46448
http://www.hrdiemen.com/search/index?utf8=%E2%9C%93&orig=1-439-533-11

I tried clicking on more information and the page is not found.

Theta-K7

Quote from: Eric on January 08, 2021, 06:43:22 PMThank you for this information.  I went to the website and did a cross reference and it comes back with something else????

HR 46448

Yeah, having poked around a little more, I've also found that one cross referenced as well... and noticed the problem with HR Diemen's site.  My best advice, if you want to pursue a HD Diemen match, is just drop Dönberg an email.  They're really nice over there.