MobileRead Forums - View Single Post - Leaf boot loop after deleting a system app

Renate · 01-28-2023, 03:27 PM

Congratulations! You have been awarded the Order of Merit (Bravery).

Mmm, I did mean single edge razor blade, not a utility knife blade...

Ok, it's open, great.
I'm looking at the circuit board trying to find the EDL test points.
That photo is really hard to see.
I can't see what I'm looking for at first glance.

So, what do you have for experience/tools?
Voltmeter (digital)?
Resistors (220 ohm to 2200 ohm)?
USB UART with 1.8V logic level?

The likely UART points I've indicate could allow you to watch boot, but you really need a particular UART that works with 1.8V. That's a new style that different than the old 3.3 or 5V style.

You're probably looking for a pair of gold dots that are not directly near a connector or springs with the same number of points.
The UART points give you a hint of things that are by themselves.

They could be hiding under some black tape, but you don't have to go ripping it all up. A bit of a peek might be in order though.

Don't try to just short anything with plain wire.
That's not a good idea until you know what's what.

A better photo of just the circuit board would help.

It's interesting to know that this just clicks together.

01-28-2023, 03:27 PM	#30
Renate Onyx-maniac Posts: 4,005 Karma: 18026955 Join Date: Feb 2012 Device: Nook NST, Glow2, 3, 4, '21, Kobo Aura2, Poke3, Poke5, Go6	Congratulations! You have been awarded the Order of Merit (Bravery). Mmm, I did mean single edge razor blade, not a utility knife blade... Ok, it's open, great. I'm looking at the circuit board trying to find the EDL test points. That photo is really hard to see. I can't see what I'm looking for at first glance. So, what do you have for experience/tools? Voltmeter (digital)? Resistors (220 ohm to 2200 ohm)? USB UART with 1.8V logic level? The likely UART points I've indicate could allow you to watch boot, but you really need a particular UART that works with 1.8V. That's a new style that different than the old 3.3 or 5V style. You're probably looking for a pair of gold dots that are not directly near a connector or springs with the same number of points. The UART points give you a hint of things that are by themselves. They could be hiding under some black tape, but you don't have to go ripping it all up. A bit of a peek might be in order though. Don't try to just short anything with plain wire. That's not a good idea until you know what's what. A better photo of just the circuit board would help. It's interesting to know that this just clicks together. Attached Thumbnails Last edited by Renate; 01-28-2023 at 03:30 PM.