or other tints. Can anyone explain this behavior to me? The previous owner dumped it because of the yellow tint, which started before Christmas and lasted until yesterday.
-- Jim
A bout of Yellow fever may be? :-)
Kidding apart, following is what I have observed in trying to repair some PC CRT monitors. This may explain some of the responses.
Whenever there was an intermittant color problem like the one you describe, it could be traced to a bad connection on the VGA connector/cable. Once or twice, I just had to straighten a bent pin in the connector. Locating a bad wire within the cable can be tricky. Some CRT monitors use small preset potentiometers to set the color balance on the CRT. If the wiper contact in a preset becomes bad, the display can become tinted. Vibration and heat can cause the contact to intermittantly get a good connection and bring things back to normal. This is probably what happens with the slapping technique. Does anybody know if the iMac's video portion uses such presets?
About something in the seller's work area affecting the CRT, it is highly unlikely to cause an overall tinting. Magnetic fields typically cause shaky pictures and add horrizontal lines in the picture. Permanent magnets (like speaker magnets) can cause localized discoloration. This is however fixed automatically when the CRT is powered off & then on - as it goes through a degaussing cycle (sort of wipes the CRT off of residual magnetic effects). Some times it may take a few degaussing cycles if the affecting magnets are too strong.
HTH
Dilip
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