Iconia W4-820 will not charge with the power adapter USB Std

Bought my W4 Iconia four weeks ago, a demonstration model, the last of them. It was packed in the box with a micro USB x adapter USB OTG cable and a power adapter. Back at home I discovered that the power adapter has been to Asus, possibly mixed in the shop. The prospective buyer of the Asus Tablet demo likely will get the Acer adapter. Adapter Asus with micro USB male connector works fine; specs are 5.2V - 1.35 amps; seems to be a STD USB adapter. The Asus adapter has a connector to USB female port to connect to a USB x microphone cable to USB adapter (with cable power adapter came in the box). Bought a 2nd power with USB 2 socket adapter to connect my W4 Iconia and my Garmin Zumo390 browser to an adapter. Specs are 5V - 3.5 amps.
The Zumo works very well with the new card, but does not work my W4. Charge light stays off. USB ports switched to he Zumo and the Iconia W4, but same result. Zumo fresh, but W4 not. Borrowed another power adapter USB, 5V - 2 mines anti-personnel and new Zumo accusations, but the W4 still does not work. Also tried different USB adapter cables, but the same thing; Zumo invoice, W4 does not work.
How is that possible? I can't tell the difference of 0.2 V between the Asus adapter and a USB adaptor STD would make the difference. But maybe I'm wrong. Wanted for adapters for the W4 Iconia and found several, but all the 5V as expected.
Can anyone help.
Will go to the shop again next week, but if I need an adapter V 5.2 I should order with Acer. 5.2 V adapters do exist not (readibly).

Resolved issues. A dark and humid Sunday afternoon back to the store with the Tablet and all the bells and whistles. Changed the card Asus for the original Acer 5V - 2Amps (10W). Took the time to find the Acer adapter in the store. Demonstrated the adapter 2nd with 2 output USB ports and it wouldn't work with the Tablet W4. Tried another and found to be ok. 2 USB ports have a different power, a port for a smartphone and the other port is one tablet. Total power rating of the adapter is 17.5W (5V - 3.5Amps); some 2.5 and 1Amps. A happy man is back home again.

Tags: Acer Tablets

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