Help Motorola V600

Hi to All!

I have an Motorola V600 that it was not voice in earpiece.
Only in headsets.Some time later there was not voice in headphone too.
Firs I tray to change the ribbon but with new ribbon voice was absent again.
I looked for any demage part inside without schematic diagram (I have not a such) but without solution. Now the phone do not start,when I put on the battery the LEDS of the keypad blink one time and nothing else.
Please!
Can anyone help me for this symptom.
My phone now is dead,what can I do.

Thank you !
Best Regards!