6.19.2016

DIY unlock MB SD Connect C4 by modifying PCB

“If your Mercedes-Benz Star diagnosis SD Connect c4 is locked, do not need to buy a new set and just change this chip is ok.” said a Mercedes owner with MB SD C4 diagnostic tool.

Here is the customer solution to unlock sdconnect c4 mux.
NOTE: AT RISK TO TRY!

PCB modification procedure:
1- Carefully open the sd connect multiplexer
2- Check whether some part is easy broken
MB SD Connect C4 printed circuit board in a good condition should be:
2016-sd-connect-compact-4-pcb-1
2016-sd-connect-compact-4-pcb-2
2016-sd-connect-compact-4-pcb-3
2016-sd-connect-compact-4-pcb-4
2016-sd-connect-compact-4-pcb-5
3- Possible occasion:
Maybe batteries leaked and damaged the PCB.
4- Blow the chip marked with a red circle by a electric hair drier
solved-sd-c4-locked
5- Disassemble the chip
6- Write the program to a new chip
7- Install the new chip to the PCB, then assemble PCBs into SD connect c4 mux
8- Start SD c4 mux
9- Connect MB SD C4 multiplexer to the laptop
10- SOLVED! And work like a charm, as a good SD Connect C4 at mbstartshop.

If method above cannot help you out please contact MBSTARSHOP customer service.

Hope this helps!

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