The original 12V 3A supply was overheating, so I switched to a 12V 4A supply. The monitor works and the replacement seems cooler. Is the higher current rating safe?
Can I use a 12V 4A power supply for a 12V 3A monitor?
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g805~parcel_6
Answers
Yes, a 12V 4A supply can power a monitor rated for 12V 3A. The 4A rating is the maximum the supply is rated to provide, not a fixed current it pushes into the monitor. The monitor draws what it needs.
Make sure both supplies are 12V DC, the connector fits correctly, and the polarity matches the marking on the monitor.
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Check the polarity symbol, not just the plug size. A connector can fit while having the wrong polarity. The markings on the supply and monitor should both show the same arrangement, such as center positive.
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A supply rated below 3A would be a different concern. If the monitor asks for more current than the supply can handle, it could malfunction or the supply could overheat. The 4A rating gives it some extra capacity.
Cooler operation is encouraging, but it doesn't prove the replacement is suitable on its own. Check its ratings and connector too, and stop using the old supply if it was overheating.
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g805~parcel_6:
So the extra amp of capacity won't force more current through the monitor?