Ok... yesterday I downloaded some schematics, last night I ran to my house and try with your advices:
I connected the Power Supply to my MP4 but there is not response... no Power supply present, no signals of life!
Then, I took my screewdriver and opened the unit. I removed the battery and connect the power supply again... but there was not response.
I connect the MP4 to the computer with the USB cable... no response and no drive or USB device detected.
Then I open some schematics and looked for some ideas... then I found some tutorials about repairing, and one of these said: 'Make a Shortcut between the capacitor lines (I think is a Crystal) for a few moments"
Ok... I tried this... the MP4 connected with the cable, and shorcutting the capacitor... and Oh surprise! in the Icon tray (near Windows clock) in computer, appears a message: "Some USB device is connected but is mal functioning" or something like that...
Wow! :shock: :shock: A little hope of life!!! :wink:
Then I check the ATJ2085H chipset pin diagram:
And I found the RESET pin... I shorcutted this pin with VCC and GND... and OH SURPRISE! The Mp4 turned on!
The Computer recognize as a Storage Device, and run the autorun... I opened the device and I can retrieve some old files and lyrics.
The MP4 was in charge/sleep mode, but suddenly the unit Turned On to the MAIN MENU.
The menus were Ok, I tried to play some music, but when the music plays the screen was unestable.
Suddenly, the MP4 return to the Charge/Sleep mode, but now with the Unestable screen.
Then, I disconnect the MP4 but now the unit won't tunr on. Is dead again
I think maybe some chip need some RESET or something like that.
* Can you please advice me something?
* Do you think my MP4 player can come back to life???
* Reviewing some notes, Now I can identify some aditional data: The board type is a MP680-CL-V11, with Chipset ATJ2085H and a Flash memory SAMSUNG K9F4G08UOA.
Here some pics: (may be usefull)
Thank you for your comments
