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Apple Computing Products:
macOS - Notebook Hardware
Intermittent Mini Displayport - VGA signal drop-out
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<blockquote data-quote="bobtomay" data-source="post: 1557760" data-attributes="member: 24160"><p>Adapters just seem to fail for no reason. Many of them begin with needing to hold your mouth just right in order for them to work.</p><p></p><p>The second thing I would suspect would be the monitor.</p><p>What happens when it's not working if you turn off the monitor and turn it back on?</p><p>If it works in that scenario, then I would guess it's a pretty old monitor and one that should be turned on after the connection is made for a reliable connection.</p><p></p><p>Based only on experience, I have no reason to suspect the MBA until ruling out the adapter / cable / monitor.</p><p>Only way to do that is by using a different adapter / cable / monitor.</p><p></p><p>Also, a mdp to VGA adapter will not be passive - it will be active (or should be) - that is it will have a DAC in it that does the conversion from digital to analog. When that DAC starts going, directionality (e.g. moving the cable around) will not have any effect on getting the signal to work/not work like we are use to seeing related to an open in the cable. The Apple mdp to VGA adapter is most definitely active as are most others I've seen.</p></blockquote><p></p>
[QUOTE="bobtomay, post: 1557760, member: 24160"] Adapters just seem to fail for no reason. Many of them begin with needing to hold your mouth just right in order for them to work. The second thing I would suspect would be the monitor. What happens when it's not working if you turn off the monitor and turn it back on? If it works in that scenario, then I would guess it's a pretty old monitor and one that should be turned on after the connection is made for a reliable connection. Based only on experience, I have no reason to suspect the MBA until ruling out the adapter / cable / monitor. Only way to do that is by using a different adapter / cable / monitor. Also, a mdp to VGA adapter will not be passive - it will be active (or should be) - that is it will have a DAC in it that does the conversion from digital to analog. When that DAC starts going, directionality (e.g. moving the cable around) will not have any effect on getting the signal to work/not work like we are use to seeing related to an open in the cable. The Apple mdp to VGA adapter is most definitely active as are most others I've seen. [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
Intermittent Mini Displayport - VGA signal drop-out
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