Monitor and KVM problem

[stretch0069]

Ok...this one is driving me nuts. (yeah yeah...further than I already am)
I have an ADI 17" CRT that I plug into my Belkin 4 port USB KVM. Then I plug my four PCs into it. Everything works just fine.

Then...I remove the ADI monitor and put in a different ADI 17" monitor. This one happens to have a 4 port USB hub built in. When I turn it on, the screen is black except for a message that tells me to check the video cable. I turn off the monitor and plug directly into any one of the PCs. Turn it on and I have video. Everything is fine. Plug it back into the KVM and the same "Check video cable" message.



Anyone ever run across this??? Does the USB hub have something to do with why the monitor won't work when plugged into the KVM??

I'm stumped on this one. Hopefully someone has the answer. I can't seem to get anywhere on Google.

[stretch0069]

Update

A bit more info.

I was using an ADi E66 19" monitor in a system with 4 computers that I had hooked up through my Belkin Omniview 4port KVM (F1DS104U). It worked just fine. The monitors are quite heavy, so I decided to leave the E66 at home and I'm using my other monitor which is an ADi MicroScan model PD-959 19" monitor. The monitor does have a built-in 4 port USB hub. The monitor will not display anything. If I unplug either the monitor or a video cable going to the currently selected computer, I get a "Check Video Cable" message from the monitor. If I then plug the monitor directly to any one of the computers, I get my video.

I have tried a number of different resolutions and refresh rates.

Like I said, with all four computers hooked up to the KVM and my ADi E66 hooked up, everything is fine. All I have to do is remove the E66 and put in the PD-959 and I get no display when I turn on the monitor. I can then hook that PD-959 directly to each computer individually and I get video.

What inside the KVM will cause this problem? Its obviously not the monitor. Internal to the KVM there must be some difference in how the KVM deals with all the ground connections or the two pins that have no connection.

If it is an incompatibility with this monitor, I dare not go buy another one for fear that it won't work either. Maybe I just got lucky in that the E66 did work.

From what I can tell, this is a problem with the KVM. Or I'm I totally off-base?

[stretch0069]

Latest Update

Just got this:

Thank you for contacting Belkin Technical Support.
Unfortunately, it would seem that it is an incompatibility with that monitor.
There are no options on the KVM for adjusting the video.


Well if that ain't a shit answer. I'm a bit pissed at Belkin now. They did give a toll-free number to call. I will definately be giving them a call.

What if the LCD monitor I want to buy doesn't work either????

Ugh.....

[willawake]

what can anybody say? the pinouts for the kvm and the monitor are incompatible. prolly the monitor does not follow the expected spec. its just bad luck i guess, most monitors should work

is the kvm using all in one cables or seperate for k v m

if you had the pinout diagram for both the kvm and the monitor you could maybe solder yourself an adapter but sounds like a PITA

ask on the boards if anyone is using that kvm with a samsung tft, all samsungs probably have the same pinout. try http://www.abxzone.com/ i remember lots of talk there about belkin and logitech mouse incompatibility there

i have a kvm problem also. now the computer reports keyboard problem on boot and after hard restart at the xp login screen it works. i have to look into it.

[stretch0069]

Ok...I'm following you.

What gets me is that if the monitor doesn't follow spec, why would it work with all four of my PCs individually?

I don't want to sound like I'm being an ass or anything. I thank you for your input. This is a mystery and I like solving them.

Yeah...I've been reading about Belkin KVMs and mice. Luckily, I don't have that problem.

Oh yeah..the cables are all seperate.

What I'm thinkin' is that Belkin did a shortcut inside the KVM that works 99% (maybe a lot less ??? ) of the time. I just happened to find it.

And get this...I have 19" monitors. Guess I never really paid attention. Damn....I need to lay off the Jack and Coke.

[stretch0069]

Latest Update

Well....I tried getting pin-outs/schematics from ADi. The guy I spoke to said he would see what he could find. I hope he can get me some info.

Meanwhile.....I got a call from a Belkin "tech support" guy. He says its the monitor. But how can it be the monitor if the monitor works connected directly to the computer???? He didn't have an answer. I decided to open up the KVM. Its out of warrenty anyway. Not much to see. I did notice that Belkin ground out the markings on a bunch of the chips inside the KVM. Hmmm... BASTARDS!!!!!!

Tomorrow I'm off to RS to get a cheap DVM. I'm gonna solve this thing if it takes me a WHOLE CASE of Jack Daniels!!!

We return you to regularly scheduled

[willawake]

Oh yeah..the cables are all seperate.

if that is the case then it is interesting.

[kc8adu]

check the sync amplitude on the input and output.
maybe h/v sync is low on the ouput of the kvm.
hope you have a scope :-)

[stretch0069]

check the sync amplitude on the input and output.
maybe h/v sync is low on the ouput of the kvm.
hope you have a scope :-)

Hmmm.....so you're thinking that the signal isn't of sufficient amplitude to trigger this monitor? If thats the case, might it mean that this monitor is set to a sensitivity level that will trigger from a direct link, but no one from the KVM?? And if so...can I "adjust" this monitor to look for a slightly lower level???

Oh damn....my head hurts now. I need more



Ya know....I don't even know we have a scope at work. I think I might be able to come up with something here though.


thanks for the ideas...I'll be lookin' into them shortly.