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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!ogicse!qiclab!nosun!klic!keithl
- From: keithl@klic.rain.com (Keith Lofstrom)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: DUST! was: Monitor Damage PERMANENT?
- Message-ID: <1993Jan1.012837.20140@klic.rain.com>
- Date: 1 Jan 93 01:28:37 GMT
- Article-I.D.: klic.1993Jan1.012837.20140
- References: <1992Dec31.123735.9812@ac.dal.ca>
- Organization: Keith Lofstrom Integrated Circuits
- Lines: 42
-
- In article <1992Dec31.123735.9812@ac.dal.ca> whare@ac.dal.ca writes:
- >
- >I have a Darius SVGA monitor hooked up to a 1MB OAK SVGA Card.
- >I have been noticing sparatic filckers and yellowing of whites.
- >Is this apparent disturbance permanent damage? ie will putting
- >another card in instead solve the problem?
-
- "Yellowing" probably means you are losing intensity on the blue channel,
- either at the CRT or in the circuit. A lot of things can cause this -
- a likely one is DUST! Dust can be conductive and is drawn to high voltage
- circuits. It can collect on circuit boards and change circuit levels.
- It can ruin the effectiveness of heat sinks, causing components to get hot.
- Eventually it can cause a monitor to catch fire. A burnt out monitor is
- bad, but not as bad as a burnt out house!
-
- The sporadic flickers could be the dust arcing over. Think of it as your
- final warning.
-
- So clean out the dust. You will find it embarassingly thick in there.
- Your mother would have a fit.
-
- UNPLUG the monitor, let it discharge for an hour or so, open it up,
- and clean it out! Q-Tips and a hose vacuum cleaner are useful; a
- compressed air jet would probably work best. Remember, there may
- be LETHAL voltages floating around inside, so take off all metal
- jewelry, wear rubber soled shoes and use only one hand, preferably not
- touching anything else. You may get killed, so please don't print
- out any copies of this message where a lawyer might see it ... :-)
-
- If there is still yellowing, you may want to find a circuit weenie to
- locate the blue level potentiometer on the video amplifier board inside
- the monitor, and have him/her adjust the blue level for you. There are
- a lot of "wrong" potentiometers in there, so don't adjust any unless you
- know what you are doing. Circuit weenies are plentiful (and expendable? :-) ),
- and would be glad to do your hardware dirty work if you show them how
- to set up smail or something.
-
- Good Luck!
- --
- Keith Lofstrom keithl@klic.rain.com Voice (503)-520-1993
- KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
- Design Contracting in Bipolar and CMOS - Analog, Digital, and Power ICs
-