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06-01-2009 06:36 AM
06-01-2009 06:36 AM
flaky KVM issue
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06-02-2009 10:11 AM
06-02-2009 10:11 AM
Re: flaky KVM issue
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10-07-2011 02:50 AM - edited 10-07-2011 03:00 AM
10-07-2011 02:50 AM - edited 10-07-2011 03:00 AM
Re: flaky KVM issue
This sounds like a defective power supply inside the KVM switch itself. I repaired several of those... it's always the elektrolytic capacitors on the power supply that fail. Causing a unsmooth DC voltage and a shaky, blurry picture. It typically takes a while until the caps become warm... as long as they are cool, they cause no problem.
Disconnect the unit from mains, open the cover and look at the power supply. Most likely you will find some bloated capacitors. Replace ALL capacitors of the power supply (or find someone who can do that) also those that are looking ok, they may be bad too.
EDIT - I just read the second part of your post.... this could also be caused by a bad earth connection of one of the attached servers or screens. If you have a voltmeter do this:
Unplug all connections except the mains cable from the KVM Switch.
Measure AC voltage between the metal shield of the connectors of KVM and cable from server.
Reading should be zero to a few volts. If it is more than maybe 10-20V there is a problem
Check this for each connection separately.
Do you have servers from different racks connected to this switch?
- measure AC voltage between metal parts of the two racks.
- if it is more than 10-20V check earth connection of the racks.
- Maybe an additional grounding link between the racks could help.
If you are unsure with these electrical things, get an electrician to do it.
"If it seems illogical... you just don't have enough information"
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