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Help needed in repairing VGA cable

post #1 of 18
Thread Starter 
Hi all. My 5 year old CRT monitor(Compaq 7540) has a problem. It displays everything with a blue tint. It has had this problem since almost 2 years. But used to show correct colors if I twisted the cable near the VGA male port. So, I was using it with the cable pressed against a wall(so that it held the cable twisted). This color distortion used to happen once in a while and I used to retwist the cable to correct it. But yesterday it occurred and I wasn't able to get back the correct display no matter in which direction I twisted it. So, I Broke open the VGA male port. But couldn't exactly locate the problem. So, would someone please tell me as to the problem in which wire causes this(Red or Green or any other)?
BTW, I'm going to get a new LCD Monitor but I want to keep this monitor too as CRTs are virtually extinct now and there's no other problem in this monitor other than this cable one. Also, it's not possible to replace the cable as it goes directly into the monitor on one end and such type of cables aren't available anywhere.
Thanks in advance.


P.S Here's the layout of VGA

Edited by mattjm - 8/9/11 at 10:14am
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post #2 of 18
What's wrong with purchasing a new VGA cable?
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post #3 of 18
More than likely the cable has an issue. If the cable can not be disconnected from the monitor then you would have to trouble shoot down to what part of the cable is bad and re terminate a new connector there. You seem to know where the damage is on the cable. Hopefully it is near the end to keep enough length on the cable. The problem is the parts/tools required will not be cheap. You would need:

DB15 male connector(should come with a grommet)
pins
shell back
heatshrink is nice
pin crimper
some type of snips(serrated scissors)

Might want to check with a local electronics parts store. Talk with the guys there and tell them what you are doing. They can find part numbers for all the items listed. Best of luck.
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post #4 of 18
Thread Starter 
Quote:
Originally Posted by Razinhail View Post
What's wrong with purchasing a new VGA cable?
Isn't available anywhere. Moreover, it's difficult to replace it as I'd need to open the monitor's case as the cable is fitted into the monitor and isn't directly removable.

Quote:
Originally Posted by ChuckLogan View Post
More than likely the cable has an issue. If the cable can not be disconnected from the monitor then you would have to trouble shoot down to what part of the cable is bad and re terminate a new connector there. You seem to know where the damage is on the cable. Hopefully it is near the end to keep enough length on the cable. The problem is the parts/tools required will not be cheap. You would need:

DB15 male connector(should come with a grommet)
pins
shell back
heatshrink is nice
pin crimper
some type of snips(serrated scissors)

Might want to check with a local electronics parts store. Talk with the guys there and tell them what you are doing. They can find part numbers for all the items listed. Best of luck.
Thanks. All those tools make me shiver lol. The issue is definitely with the cable because if I remove the cable, the monitor shows "Check Video Cable" along with RGB bands and all the colors appear perfectly. The monitor's OSD also appears correctly. I'll try checking the wires now and will come back.

P.S Here are some images of the screen(sorry for the quality. Taken with a cell phone's 2MP cam)

ATI Catalyst Control Center with notepad in the background


Win 7's media center

Edited by mattjm - 8/9/11 at 1:20pm
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post #5 of 18
If memory serves me correctly, I think the blue screen is caused by a bad ground (which causes an abnormally high voltage on the blue wire). I just can't remember which pin was ground for the blue.

That really sucks that your cable is hardwired into the monitor. I've got an old CRT monitor that is like that. It makes situations like this even harder to correct.

I do have a question for you, when you twist the cable, do you twist it part way down the cable, or is it right near the end where it goes inside the monitor that has to move? If it's partway down the cable, you could go out and purchase a standard VGA cable, cut one end off of it, and cut your cable and splice the two together. With some patience, plenty of shrink tube, and a little luck, you can make it look fairly decent, and if you are able to cut out the bad section in the cable, your problems will be gone!
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post #6 of 18
Thread Starter 
Quote:
Originally Posted by Razinhail View Post
If memory serves me correctly, I think the blue screen is caused by a bad ground (which causes an abnormally high voltage on the blue wire). I just can't remember which pin was ground for the blue.

That really sucks that your cable is hardwired into the monitor. I've got an old CRT monitor that is like that. It makes situations like this even harder to correct.

I do have a question for you, when you twist the cable, do you twist it part way down the cable, or is it right near the end where it goes inside the monitor that has to move? If it's partway down the cable, you could go out and purchase a standard VGA cable, cut one end off of it, and cut your cable and splice the two together. With some patience, plenty of shrink tube, and a little luck, you can make it look fairly decent, and if you are able to cut out the bad section in the cable, your problems will be gone!

The part where I twist is near the end which is connected to the graphics card. If these experiments don't go well within the next 24 hours, I'll get a new cable and splice it like you mentioned.
BTW, I did some experiment and found the following.
1. If I get any of the wires numbered 6 to 10 to touch the non insulated bunch of wires(aluminium or steel) (when I first opened the VGA plug,those wires from 6 to 10, except one of them, were tied to that bunch), the echoing effect on the screen goes away, but no change in the colors.

2. No matter how strong I press or twist the wires numbered 1 to 3(R,G,B), there's no effect on the screen colors, so, I think there's a problem with the ground like you said.

3. The wire from pin 11 has got cut(mostly when I broke open the plug) and I can see a small piece of a wire's insulator left over in it, which is green in color. But among all the wires, only those in the middle row, i.e, wires 6 to 10 are green in color. So, I don't know which of them was connected to pin 11(There's no other suspending wire, so it must be one of them). Pin 11's description is ID0, may be that is why the monitor is being shown in Windows 7 as 'Generic non PnP monitor' whereas before opening the cable, it was being shown as 'Compaq 7540'.
Edited by mattjm - 8/9/11 at 1:54pm
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post #7 of 18
Thread Starter 
P.S The display is actually like an old Black and White monitor, except that everything is in blue instead of white.
Edited by mattjm - 8/9/11 at 1:52pm
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post #8 of 18
If you do decide to perform a splice, be sure to take TONS of pics and make a nice little thread so we can all see the results of your work. It will probably be a pain to work with shrink tube that small, but it will be worth it. Good luck! I have faith that your problems will be solved soon
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post #9 of 18
Thread Starter 
Thanks a lot. Sure, I'll take a lot of pics but expect them to be of crappy quality like the ones attached in this thread .

P.S Still got some work to do. If anyone has got any idea regarding the things mentioned in the above posts, please respond.
Edited by mattjm - 8/9/11 at 1:52pm
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post #10 of 18
Crappy pics beat no pics any day!
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Big Baby
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