Becker BE7050 problem

[yasser]

Hi, Friends,
I'm trying to repaire Becker BE7050.
Car is Mercedes C class W204 with original audio and navi.
It is in one chasis.
Caraudio is starting for about 10sec after that it shut off itself, and then it's turn on. And that is cycling.
I'm swich it off by power button, but after 3-4 sec it start again by it self. All the time it is ON and then Off, and then ON .......
I have to disconnect battery.

Does someone know what is the problem inside?
I open it and there is nothing visible like problem.
I clean it with alcohol, but problem still exist.

This radio can work only when it is in car, because it wait for can signal.

[M1DJF]

does it stay on in the car if yes than it can be can bus its looking for(can bus) network

[yasser]

Thank you for your answer.
It stay ON for about 10sec and then it go OFF.
All go OFF, cardio , display, soung ....
Then Again ON ...

When I check with star diag there was one error about "undervoltage" , but I check with muptimeret and voltage is OK.
Maybe somewhere inside in radio is mising, or it is undervoltage.
Problem is this radio is hard to check, when it is inside in car.
I star there was one menu about problems and solution, and there was writen about "Radio is swiching ON and then On then restart again ON and Off" specialy for this model, but to view this solution or manual I have to be registered in MB service and connect with star to the server. I can't, because I'm not official MB repair service.

That's why I'm looking for solution , maybe someone had same problem.

Thank you.

[yasser]

No one have experience?

[LegendPT]

close the fiber optic circuit, the unit should work