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12-23-2021 10:20 PM
I can't get my U28 USB C port to deliver power to a USB powered sound-bar after U28 powers up. I have to unplug and replug the USB C cable while a sound signal is present for it to work! ... More strangely, the sound-bar can't get enough power to drive the sound when connected to any of the U28's USB B ports. But when I connect a Pantech modem charging port to the U28 USB B port, the midem gets all the amps it wants to stay charged, and to put out secondary power for the sound-bar! Why are U28 ports so weird?
12-24-2021 01:52 PM
What is the wattage rating required for your sound bar ? Does it have USB-C port ?
The USB-A ports only have standard wattage rating. May be you can use USB-C port because its power delivery is up to 65W
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12-24-2021 04:57 PM
Thank you, Banhien. I *am* using the USB C port to power up the sound-bar in one of the scenarios I have described. In this scenario, starting from a monitor shutdown I have to start the sound signal coming from the monitor's 3.5mm audio out port (play a video for example on HDMI port), then unplug the sound-bar's USB power cable from the monitor's USB C port, and plug it in again in order to hear the sound. Even though the sound bar light is "on" when plugged into USB C port, it produces no sound if the sound signal starts after its powered up from USB C! It was a similar situation with a chargeable Bose speaker that needs 1 amp 5 volt charge source. The U28's USB C port seems to have a mind of its own and send to provide power under certain demand circumstances. It's not a plug and play port and the firmware doesn't allow it to be reconfigured. It is meant to be plugged into a laptop, and won't offer rated power without an intelligent demand signal even though the U28 is set up for Performance. BTW, all of this is possible if USB C is in 3.0 mode. In 2.0 mode it provided zero power. At least the older USB ports are dumb enough to be functional in more predictable ways 🙂 ... My solution: don't shut down the monitor. Let it only sleep.
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