Defender riddle

mycldean

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I have a defender also that I'm having some issues with. I was wondering if you could help me out.
When I first got it it would not power up the power on off switch on the back door was turned around backwards and screwed in to the side. The monitor cable and sound board cable were both wired diffrent then schematics showed so I have corrected that and there was some kind of power supply conversion box that I took out and fixed the original power supply.

For a while the old pcb board would spark up and blow a 4 amp fuse so I orders a new board set on line.( not eBay but from a web site)

1. I have new board set I ordered from a Web site. That is installed

2. Power supply checks out and works fine.( after a bridge rectifier replacement)

3. It looks like a fairly new vision pro monitor inside.

4.When I turn it on a hear a start up sound but no picture.*Only blue lines on horizontal scroll.

5. I get all three lit LEDs on the power supply and at start up you get ll 4 LEDs lit once and then they go off.

6. The power supply will work to run stargate as well. And the monitor from stargate when hooked into the defender board set gets scrolling blue lines

7.I have read something about the monitor not bieng ready for the original boards without a hack.

8. Iv been staring into the back of this defender for 5 days now.


Any ideas I'm going crazy here.
 
The monitor cable and sound board cable were both wired diffrent then schematics showed so I have corrected that and there was some kind of power supply conversion box that I took out and fixed the original power supply.

1) How were they wired?

2) Do you have pictures of the "Power Supply Conversion Box"?

3) What type of RAM is on the CPU board? 4116 or 4164?
 
1.The wiring was suspect and I have found a couple of strange wiring issues but I think I have them per the schematics now

2. I can take pic but iv pulled that out since and fixed the 12v led issue from the original ps... It was a bridge rectifier and q1 component. Ps is in good order now and will even power up a stargate cab I hav I got from Ken Graham.

3. 4116 are in the new board that's installedb... But 4164 were in the old board I removed.
 
Yes there was a similar adapter that was hooked to a box that was mounted to the floor of the cab close to the ps And I fried the board shortly after and about 20 4 amp fuses... But I had already ordered another one that installed now with 4116's installed.
 
Ok, Here is what you should have...

This is assuming you don't have an Early series Defender board.

Video Connector 1J4

Pin Connection
1 Red
2 Green
3 Blue
4 Ground
5 Vertical Sync
6 Horizontal Sync
7 N/C
8 N/C

On the Vision Pro you should have:

Pin Connection
1 Red
2 Green
3 Blue
4 Ground
5 Vertical Sync (+)
6 Horizontal Sync (+)
7 N/C (Key)
8 Ground
9 Vertical Sync (-)
10 Horizontal Sync (-)


So you should connect to pin 1 to 1, 2 to 2, etc.. for pins 1 through 6.

With those connected you should get an image. If you are not, then you have a PCB issue.

Even if the Sync is off, you should get something other then solid Blue. If you cannot see the Rug Pattern when it boots, then you need to check the video out of the PCB to see if it's even generating a signal. You can do this by using your multi-meter and testing pins 1 - 3 to see if you get any voltage on them. If you read 0 volts or very close, then you're not getting video out.
 
Thanks! This looks like what I have but I will double check and let you know.

1.I have 7 pins only on the ij4 male pins on the pcb board FYI ( its this way on the original and the replacement I got) but I see you mentioned 1-6 only but I thought I'd let you know.

2.And I count pin 1 as the one closest to the reset button is that correct? At least that's also what my schematics show..

3.Also please note I'm
Getting a blue horizontal scrolling line on black back ground not a solid blue screen... In case it matters

4.I'll check the voltage as well and let you know. I do this with the power on and black lead on ground pin and red lead 1-3

Thank you for you very much for the help! I'll check these and let you know.
 
Ok I tried to check the voltage but I'm not getting a reading... However I also checked voltage on my working stargate monitor connection and I also got no reading... So I think I need a lesson in using my voltage meter. I think I got "radio shafted"

All wires are lined up correctly. Now I do have them just inserted in the female pin hole. Not crimped at the moment not sure if that matters or not.

I also called the company I bought the new pcb board from he said it was tested prior to shipment and would gladly take it back but his thoughts were my monitor was not syncing properly. And I should try to cut the positive sink link.

I'm going to go for this as a last ditch effort when I get home.
 
im going to say you have something wrong with your rom board....... my defender did something like this and it was a bad repair by some guy in austin that advertises on ebay that he repairs them..don't know if that person/company are memebers on here or not... but thats what solved my problem...
 
Clipped the lead still no image other than scrolling stripes. I'm in over my head here.

Check the Ribbon cable on the ROM board (wiggle the cables/press down on the connectors while it's on and see if your image changes). If your video changes you need to either tighten the connectors or replace the ribbon cable.

If that has no effect, it could be the Sync chip at 3A.
 
I'll give this a shot... Do you know anything about the positive and negative sync? Am I supposed to run a wire or how does that work on the vision pro?

Looks like a repair man is in order
 
I'll give this a shot... Do you know anything about the positive and negative sync? Am I supposed to run a wire or how does that work on the vision pro?

Looks like a repair man is in order

The Vision Pro supports both Syncs.

You would either run pins 5 and 6 on IJ4 to pins 5 and 6 on the Vision Pro, or you would run pins 5 and 6 on IJ4 to pins 9 and 10 on the Vision Pro.

You shouldn't have to mod your PCB in anyway.
 
Hmm... Then I'm bieng told two diffrent things... The pcb man said I need a mod... For the vision pro??

Not that I can see. Defender puts out Separate Horizontal and Vertical Sync with a Positive Polarity.

The Vision Pro should support Separate H & V Sync in both + and - polarity.

You can look on the Monitor's PCB and it should be printed right next to the connector.

The Mod should only be needed for hooking up to monitors that only accept a Negative sync.
 
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