Guzunty Pi loading problem troubleshooting

Now I am checking out the JTAG CLK and TDO signals of successful loading for the first Guzunty Pi.  The signals in the beginning, middle, and end, are like the 3 screen captures above.  

For the seocnd Guzunty Pi, the waveform at the beginning is similar, but then afterwards, nothing similar happens, except short pulses every long period, which I think is the retry period.

So what I should now is check GP #2's soldering work etc, and retry loading to get similar pattern as the good GP #1.

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