OK, it's assembled and working. Yippie!
One nice thing they did to lower the SMD stress is they give you 1 extra resistor for each value.
I got lucky and did not need them.
The Banggood SMD station for ~$20 is worthless. It does not transfer heat. The tip will melt solder but touch it to a pad and it's useless. I used the Hakko 936 solder station (also from Banggood) and it did fine. Set temp to 275c and a pointed M900 new tip for the SMD work. No problem.
Now thinking about a case. I have panel mounting momentary switches.
Need panel mount 2p3t rotary or toggle switches. I think slide ones will be too much trouble to neatly install.
Well, it worked for 5 minutes. Now there is no trace. Other parts of the screen are ok.
There is simple trouble shooting flow chart but it did not help.
Edit:
I only lose the trace if I choose a time base of 50 ms or greater.
Everything is cool at 20 ms or faster. Hopefully that will simplify finding the problem.
Also looking for a Win XP USB driver for the device.
Updated firmware here:
http://www.jyetech.com/Products/LcdScope/Firmwares_138.php
Added read-outs for various waveform parameters including Freq, Cycle, PW(pulse width), Duty (cycle), Vmax, Vmin, Vavr, Vpp, Vrms. To turn on/off the read-outs first move cursor to the position of timebase. Hold down the [OK] button for 3 seconds.
http://www.jyetech.com/Products/LcdScope/UserManual_138.pdf
Here we go! Downloaded the source code and this is in the readme file.
0.37 2015.03.05 Fixed a bug that sometimes causes hang when timebase is changed from 20ms to 50ms
I can't get the usb driver from jytech to work so no hope of updating the firmware yet.