Fixing White Streaking of Belkin Omniview Pro2 KVM (F1DA108T)
Intro: Fixing White Streaking of Belkin Omniview Pro2 KVM (F1DA108T)
Here is a quick way of fixing an expensive KVM made by Belkin.
The problem is that after a while white streaks show up that makes using the KVM impossible.
Hardware needed:
1 x Belkin Omniview Pro2 KVM 8-ports (dunno if it will work with 16/4 ports) - F1DA108T
Parts needed:
1 x 100uf @ 25V
Tools needed:
1 x Solder wick
1 x Soldering iron
1 x Philips screwdriver
1 x Pliers
The problem is that after a while white streaks show up that makes using the KVM impossible.
Hardware needed:
1 x Belkin Omniview Pro2 KVM 8-ports (dunno if it will work with 16/4 ports) - F1DA108T
Parts needed:
1 x 100uf @ 25V
Tools needed:
1 x Solder wick
1 x Soldering iron
1 x Philips screwdriver
1 x Pliers
STEP 1: Problem?
First lets see what the problem is.
As seen in the image it is unusable.
well lets see how it can be fixed.
1. My first ideas were that if I connect a screen directly to the computer there is no problem, so it has to be the KVM
2. This problem appears on all ports, so it has to be something in the output circuits.
3. Start probing in the output circuit.
4. Check power adapter.
5. Check any power regulators maybe they are faulty.
As seen in the image it is unusable.
well lets see how it can be fixed.
1. My first ideas were that if I connect a screen directly to the computer there is no problem, so it has to be the KVM
2. This problem appears on all ports, so it has to be something in the output circuits.
3. Start probing in the output circuit.
4. Check power adapter.
5. Check any power regulators maybe they are faulty.
STEP 2: Opening the KVM F1DA108T
First unplug the power adapter.
Open the KVM using the screwdriver, there are 4 screws on the top and 2 on each side.
Open the KVM using the screwdriver, there are 4 screws on the top and 2 on each side.
STEP 3: Where the Problem Is.
On the top you will see the 2 chips that are responsible for the pass-trough video and OSD (On screen display)
I first removed one and see what kind results I'd get, one chip is responsible for the internal video over signal (the smaller one) and
the other for the output itself.
So the problem was probably in the bigger one since it is responsible for the output.
Check other capacitor for leakage or other deformities.
I first removed one and see what kind results I'd get, one chip is responsible for the internal video over signal (the smaller one) and
the other for the output itself.
So the problem was probably in the bigger one since it is responsible for the output.
Check other capacitor for leakage or other deformities.
STEP 4: Fixing the Problem
I do not have an oscilloscope just a multimeter (cheap one at that)
so the most that I could do is to check voltages and resistances.
But there I saw an unpopulated space for a capacitor and I thought maybe add a capacitor here and see what happens (C78).
And I did just that to see what happens aaaaaaaaand it worked! I could not believe my luck!
So what you need to do is to remove the top board from the case, this takes a while since the board is held by that screws in the
back that hold the VGA ports so you will have to remove 18 screws using the pliers.
Than gently lift the board applying force near the board connectors.
so the most that I could do is to check voltages and resistances.
But there I saw an unpopulated space for a capacitor and I thought maybe add a capacitor here and see what happens (C78).
And I did just that to see what happens aaaaaaaaand it worked! I could not believe my luck!
So what you need to do is to remove the top board from the case, this takes a while since the board is held by that screws in the
back that hold the VGA ports so you will have to remove 18 screws using the pliers.
Than gently lift the board applying force near the board connectors.
STEP 5: Adding the Capacitor
Use solder wick to remove the solder from the two place near C78.
Put the capacitor (100uf@50V) and solder it.
Assemble the board back and give it a go (careful not to touch anything while it is working!)
After that close everything up and screw back into place.
That is all, hope that helps!.
Ronen.
Put the capacitor (100uf@50V) and solder it.
Assemble the board back and give it a go (careful not to touch anything while it is working!)
After that close everything up and screw back into place.
That is all, hope that helps!.
Ronen.
7 Comments
Lord Les 6 years ago
Hey look! Empty spot for a capacitor. Let's put one in. Yay! :)
ferret2013 9 years ago
Hi ronen1kr
Thanks for the advice ~ I had the white lines issue and was ready to buy a new unit, until I stumbled on this article. On my KVM, both capacitors were actually soldered in pace, so it wasn't a case of fitting what wasn't there.
However, it's a fact that standard electrolytic capacitors become defective after a number of years, so I replaced the 2 x capacitors either side of the video output chip with nice new 100uF tantalum components ~ voila; no more lines and a sharper video signal.
My 16 way Belkin has served me well ~ it cost me £40 on Ebay three years ago, including the cables ~ a bargain with a new lease of life
Thanks again!
ttongue 9 years ago
Very cool, thank you. My Pro2 was apparently a different model from the one that you show, but still has a vacant spot for a cap off the middle of the OSD01 chip. Installed a 100uF @ 25V cap and the picture is nice and clean now.
sptbear 9 years ago
This fix solved the white streaking horizontal lines on this KVM. Easy to do, only took about 10 minutes to replace the faulty capacitor.
Abrondino 10 years ago
Although I must have a different version of the circuit board because mine had the capacitor in place where yours only had a socket, I removed the one that was there and replaced it with a new one I bought for 50 cents. I am happy to say that the unit is working again. Brilliant instructions! Thank you VERY much because I would have ended up throwing this thing out. As a side note, I found that Belkin's site has no help file worthy of any use in this situation. Your help-file is truly worthy of praise!
binarysleeper 10 years ago
Brilliant. Never soldered before so was an interesting learning curve. Well worth it. 50p to make a functioning 8 port KVM that someone chucked out.
Evonder 11 years ago