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09-28-2021, 02:24 PM | #31 |
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Another idea I've had is to dig into the sunxi wiki and learn how to boot over USB, since the A13 chip is detected by sunxi-fel, but I fear I won't have time to try this before my vacation ends.
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09-28-2021, 03:02 PM | #32 |
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You can easily check if the buttons are working by a multimeter switched to a continuity tester mode (if you connect the probes you hear a buzzer sound). Then you connect the probes to both pins of the button (you should not hear the buzz) and you should hear a buzz when you press the button. There are 4 pins on each button in fact, while two pins are connected.
For connecting to the UART you can buy USB to TTL adapter , but choose one that supports both 5V and 3.3V as the UART on the ebook is 3.3V. There are also interesting information about reverse engineering the ebook here: https://www.synacktiv.com/en/publica...-reverser.html Last edited by kib; 09-28-2021 at 03:07 PM. |
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09-29-2021, 08:29 AM | #33 | ||
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From https://linux-sunxi.org/FEL#Serial_output:
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09-29-2021, 08:37 AM | #34 | |
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I have tested the power, left and right buttons with an improvised continuity tester (3.3V power source, resistor, LED). Confusingly the LED powers on regardless of button state, but there is a very clear increase in brightness when I push a button, so let's assume the method is valid. The right button (page down on PB614) is stuck as ON, as nhedgehog suspected. Can it be fixed? |
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09-29-2021, 08:43 AM | #35 |
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I have an Arduino and will find something to handle the voltage difference, but I guess I'd have to solder the wires to the PB board?
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09-29-2021, 09:14 AM | #36 |
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That could be possible. From what I see, the directional buttons are soldered hollow metallic caps with rubber glued on top of it. I would carefully try to remove the rubber and either unsolder the metallic cap or try to remove the dent, that I'm sure exists under the rubber, without unsoldering it.
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09-29-2021, 10:40 AM | #37 | |
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Quote:
Edit: attached photo of board Last edited by DoomsdayDog; 09-29-2021 at 11:02 AM. |
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09-29-2021, 11:19 AM | #38 |
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No we are not, I made a red circle around it. Are you sure about the other button?
The button you are pointing is different to repair. Did you try to press it a couple of times. How does it respond? |
09-29-2021, 11:30 AM | #39 | |
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The opposite button and the power button: also feel normal to touch. LED tester shows that the circuit closes only when I push these buttons, so they are not stuck. The round buttons on the directional pad: I don't know how to test these because the four pins I was using to test the other buttons are not exposed. These buttons also feel normal to the touch now that I have freed them from the front cover (but yes previously they felt weird through the plastic pad). Last edited by DoomsdayDog; 09-29-2021 at 11:35 AM. |
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09-29-2021, 12:11 PM | #40 |
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You didn't free them before. Try to click them several times especially the right D-pad button. After that try to boot up the device.
PS: One contact is the outer rim of the button, the other is probably on the other side of the board. Last edited by nhedgehog; 09-29-2021 at 12:13 PM. |
09-29-2021, 01:21 PM | #41 | |
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So at this point the only abnormal button is the one I pointed, which has a closed circuit whether I press the button or not. So that must be the button that's stuck in the "ON" state. How do I take this button apart? Last edited by DoomsdayDog; 09-29-2021 at 01:34 PM. |
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09-29-2021, 02:01 PM | #42 |
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That will be difficult. Unsolder it, see if the device boots up. If yes you can try to pry it somehow mechanically open and repair it or look for a replacement in the internet.
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09-29-2021, 03:19 PM | #43 |
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Time to learn soldering. I will be away for school and return for Christmas break, by which time I hope I will have the equipment and knowledge to remove the button - will it be OK to bump this thread after so long?
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09-29-2021, 03:28 PM | #44 |
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No problem for me. Just make sure to get a soldering iron with a very small (needle) tip and a sharp cutter knife to get under the button. It is not as easy as it looks, since too high temperature can destroy the mainboard. Look for some SMD Soldering Tutorials.
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09-30-2021, 05:34 AM | #45 | |
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