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Originally Posted by knc1
Inspect the board at the pad areas.
Using a very bright light to penetrate the green protective masking helps.
What you are looking for is the pad which is connected to the very large area "shadow" - THAT pad is the "Gnd" connection.
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Based on that description, it looks like pad #1 (pictured below) is the Gnd connection:
Quote:
On the DX, DXG both U-Boot and the kernel serial console uses:
115000,8,n,1
All other Kindle models use only 115000,8,n,1
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The above are the options I went with.
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Using ONLY the lead marked "Rx" from the adapter (which you now have optioned for 1.8 volt operation - see above) as a test probe ;
With your terminal emulator running, already configured for the proper line speed conditions ;
(Doing this first prevents any of the setup command and initialization commands from reaching the Kindle.)
Connect your "test probe" lead to one of the remaining three pads ;
Restart the kindle ;
Do you see readable characters in the terminal emulator?
- NO: Try the next un-tried pad - repeat the "Restart Kindle" step.
- YES: That is the proper connection point for the "Rx" lead.
This leaves you with two pads and one wire.
Have just verified the connection points for the first two wires.
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This is where I'm stuck. I've tried connection the "Rx" lead to all 4 pads and restarting the DXG in each instance, yet still no output.
Strangely, I've noticed that once the DXG is fully booted, if I touch the lead to one pad or another, I see a character that looks like a diamond with a question mark inside. Sometimes one of these characters appear, sometimes two, three or four. Occasionally, I got some other strange characters. Below is a pic I took after touching the lead to different pads many times:
What does it mean that I can't get a regular output but these weird characters show up?