When you say "when init sd with repetier (sd insert)" does this mean that you use repetier firmware? or repetier host? or both?
How are the results with the SD_listfile sketch?
If you want to use a multimeter to test voltages, then you probably need to make a sketch that (slowly) sets each pin to high and then low, so you have time to measure.
Otherwise you will need a tool that can keep up with the speed of the data stream, so it is able to register highest and lowest voltages. This typically means an oscilloscope or a logic analyzer. Perhaps if you multimeter has a high, low, avg setting, it might be able to give partially useful results, but I still wonder if a multimeter can register voltages for a data stream with the speeds of SPI.
The challenge will be, to measure these voltages, inside the card-reader-slot. Because this is the only way that you will be able test every link in the chain. Perhaps if you have a sd-card adapter, where you connect wires inside the sd-adapter? I do not know if this is possible, as I have not (yet) tried this myself.
Another way could also be to wire up a sc-card adapter, like solder those wires to the outside of the SD-adapter, and then plug a micro sd-card into that adapter.
This would eliminate any contact issues inside the sd-slot, that is soldered on the LCD pcb.
How are the results with the SD_listfile sketch?
If you want to use a multimeter to test voltages, then you probably need to make a sketch that (slowly) sets each pin to high and then low, so you have time to measure.
Otherwise you will need a tool that can keep up with the speed of the data stream, so it is able to register highest and lowest voltages. This typically means an oscilloscope or a logic analyzer. Perhaps if you multimeter has a high, low, avg setting, it might be able to give partially useful results, but I still wonder if a multimeter can register voltages for a data stream with the speeds of SPI.
The challenge will be, to measure these voltages, inside the card-reader-slot. Because this is the only way that you will be able test every link in the chain. Perhaps if you have a sd-card adapter, where you connect wires inside the sd-adapter? I do not know if this is possible, as I have not (yet) tried this myself.
Another way could also be to wire up a sc-card adapter, like solder those wires to the outside of the SD-adapter, and then plug a micro sd-card into that adapter.
This would eliminate any contact issues inside the sd-slot, that is soldered on the LCD pcb.