reprogram Becker Grand Prix 754 / 755

[xitpa]

Hi, does anyone know how to reprogram a Becker Grand Prix 754 (or 755 Mexico) that shows the ---- display?

This radio does not need a code.

I know that Becker in the US can reprogram it.

I know that Mercedes used to have a special tool that they could use to reset the radio.

But does anyone know how to do it or exactly what the tool does?

[gapco]

That special Mercedes tool does not exist and the radio does not have a programming port.

Replace the microprocessor to fix the fault. This was a common problem in this radio.

[xitpa]

do you know which microprocessor to replace?

[RadioChiP]

Try this....Connect this radio Battery Power On Wait 5~6 hour .

[gapco]

do you know which microprocessor to replace?

There is only one microprocessor. It is the 40 pin chip on the right side of the top PCB and it probably has a metal shield as a cover and heat sink.

[xitpa]

My understanding is the dashed out display ( ---- ) is caused by the anti-theft and / or the internal battery dying, not because the microprocessor is faulty.

Perhaps the anti-theft/dead battery damages the microprocessor (it does have an EPROM built in, I believe). If it's the EPROM, maybe it can be reprogrammed?

[bruno504]

anyone found solution for this radios?