Motorola L7e DIY

Question

Arduino

Good day to all.
Background:
Recently, I have been very, very interested in reading articles about any developments in the field of robotics, and simply Arduino. After reading a little about this miracle, I understand that the processor from my old Motorola L7e is quite suitable for such cases, but there are some difficulties
: before putting it on the far shelf, it was drowned six months before, and then worked for these 6 months, the battery swelled and stopped charging, the charge was only enough for 1 hour of bedtime (or 10 minutes of music).
2) When trying to connect another battery to the phone, we have the same symptom as after “bathing” (about 50% of the keyboard backlight ALWAYS works), although the phone worked with this symptom earlier, but now it can’t turn it on. When you press the power button, only the backlight of the keyboard only increases the brightness by 100% (for a couple of seconds), and then again to the prescribed 50%.
3) Connecting to a computer with the subsequent inclusion of the boot-mode (* + # + _on_button_), or even without it, was not successful. Not a single necessary tool sees the phone in any way.
4) I tried _restoring_ survivability using a test point (closing a couple of points on the board, leading to clearing the flash memory) - it does not help.

But one interesting point: When I connect this miracle to my computer, nothing happens for a couple of seconds, and then a small indicator diode lights up above the screen. Because of such a huge delay, I still think that the phone is alive and ready to work. Sobsno what do you advise to do? I really want to make it work and assemble a megarobot that will enslave the world , but I’m still not friends with a soldering iron and, accordingly, cut out their processor and assemble it on a separate board (as DIHALT did with an arm processor on easyelectronics.ru) I don’t according to the forces ...
Sobsno question: what will you tell me to do, how to revive the corpse or check its survivability?

Answer 1

Judging by the symptoms, it's better to buy an arduino right away. Although this is my personal opinion

Answer 2

Do you have specs for the controller? What's the percentage? ARM6, Snapdragon, HEX? How to initialize peripherals? How do you put your program there? Is there a bootblock? How to debug?

Answer 3

Heh heh. But drowned people are not repaired with testpoints and firmware. First, disassemble your phone. Warm up with a hair dryer. Look at the result. If there is no sense, we drip further. We take a tester and start ringing all the circuits. Start from the charging circuit to the top. Look for the weak link (at best, just a sweat, at worst, the food chain has been shaken). About charging. Take any charge from the phone, cut off the end. You have two wires, + and - (charging should preferably be with an indicator light), we connect + to + - to - respectively. We hold for 3-5 minutes, the battery came to life. Now she will be able to charge normally (assuming she is planted at 0 and not dead). Did you find what was dead? We google the Internet and look at donors, we buy and solder. And don't forget to download the datasheet.
In order for you to start to understand normally soldering, repairing, assembling and not be afraid of a soldering iron, you NEED to kill a couple of mobile phones. Otherwise, no way) I also advise you to buy a hatch station 701 for example.
You dug in the wrong direction. Good luck.

Answer 4

The processor there is small for an ordinary soldering iron. If you cannot determine if the phone is alive, then you most likely do not have the equipment and skills to solder such components. Discover microcontrollers.

Answer 5

To restore motorola you need here , then from there follow the link to the FAQ on TP for L7e Z3 K1 (iron Test-Point)
So you can check its performance.
And for DIY - it's easier to take an Arduino :)
Symptoms when turned on - it tries to charge.
How do you turn it on when it sits at 0. Charge for 5 minutes with your own (!) Charger, neither from the computer nor the “universal” one helped me. Without removing it from charging, turn it on, after turning on the screen (it will turn white), plug the power connector, it will continue charging. Sometimes it doesn't work the first time.