MobileRead Forums - View Single Post - Nova Pro - Stripes on screen after using fast charger

Renate · 09-05-2022, 10:13 PM

It doesn't look good. Does it react to anything?
When you plug it into a computer is it recognized as anything?
Does a long (30 second) power switch press do anything?

Theoretically, no charger should harm a 5V only device.
OTOH, there is complicated standard and proprietary charger logic that if it got confused could pump 20V into your poor device.

Too high voltage can cascade through a system in unexpected ways.
I was helping someone who accidentally let 3.6V into the 1.8V bus.
None of the 1.8V stuff appreciated it, but it wasn't that bad.
The battery however fed a 12V boost converter that fed the LCD backlight.
That got its reference from the 1.8V so it tried to generate 3.6V / 1.8V * 12V = 24V
The 24V vaporized the backlight.

09-05-2022, 10:13 PM	#2
Renate Onyx-maniac Posts: 3,995 Karma: 18026955 Join Date: Feb 2012 Device: Nook NST, Glow2, 3, 4, '21, Kobo Aura2, Poke3, Poke5, Go6	It doesn't look good. Does it react to anything? When you plug it into a computer is it recognized as anything? Does a long (30 second) power switch press do anything? Theoretically, no charger should harm a 5V only device. OTOH, there is complicated standard and proprietary charger logic that if it got confused could pump 20V into your poor device. Too high voltage can cascade through a system in unexpected ways. I was helping someone who accidentally let 3.6V into the 1.8V bus. None of the 1.8V stuff appreciated it, but it wasn't that bad. The battery however fed a 12V boost converter that fed the LCD backlight. That got its reference from the 1.8V so it tried to generate 3.6V / 1.8V * 12V = 24V The 24V vaporized the backlight. Last edited by Renate; 09-05-2022 at 10:23 PM.