Title: Hantek 6254EU broken [Print this page] Author: ARNI Time: 2020-7-26 21:20 Title: Hantek 6254EU broken Edited by ARNI at 2020-7-26 22:24
Hello!
I bought an oscilloscope Hantek 6254 EU. The ground contact of the probe of the first channel was briefly hit by a voltage of ~ 100V.
The oscilloscope is no longer detected by the computer (another USB port). The USB port of the computer is also defective.
Externally burned elements on the board are not visible.
USB does not work. The CY7C68013A-56LTXC microcontroller probably burned out.
The microcontroller can be purchased and re-soldered.
But where can I get the firmware for it for this oscilloscope?
Board marking: DSO6XX4 H V1.05 2017 02 15.
P.S.Am I correct in understanding that CY7C68013A-56LTXC is not programmable?
Next to it is the 24LC02BI chip. Can I check it somehow?
What else can you check on the board to determine the malfunction?
Author: wangshuang Time: 2020-7-29 15:25
Measure the voltage 1.8, 1.2, 3.3 voltage, try to replace the 68013A chip, and then re-test these three voltages to see if they are normal.
Author: ARNI Time: 2020-7-31 05:36 Edited by ARNI at 2020-7-31 05:40
Thanks to wangshuang for the advice.
I looked at the experience of other USB oscilloscope owners with similar problems.
I replaced the microcontroller CY7C68013A-56LTXC (U16), now the oscilloscope is working. I was lucky)))
At the first start there was an error: there was no FPGA0.bin file. (see screenshot). But for the rest, I don't see any mistakes in the work.
[attach]3753[/attach]
I will describe in more detail for those who may face the same problem.
The measured board was connected to a computer via a USB programmer (common ground). The oscilloscope ground probe was connected to the part of the board where +100 volts from ground appeared for a few milliseconds. The oscilloscope is no longer detected by the computer. And the USB input of the computer, where the oscilloscope was connected, burned out.
The voltage at the test points on the oscilloscope board: 1.25V, 1.8V, 3.3V, etc. was normal.
But I measured the resistance at these points relative to ground and at 3.3V it was only 18 ohms. There are several 0 ohm resistors on the board between the power supplies and the chip groups. This is a very smart decision. This is found throughout the board. You can detach part of the circuit and test it separately. A huge plus for the developers of such a solution!
After soldering part of the circuit with the CY7C68013A-56LTXC microcontroller, I realized that there was a small resistance source in it (it was not difficult, because the USB interface did not work). After I removed this microcircuit, the resistance of this circuit became several hundred ohms. Also in this part of the circuit, a 24MHz QR1 generator and a U807 memory chip are connected to 3.3V, but they were normal.
After installing the new CY7C68013A-56LTXC microcircuit, the oscilloscope was detected by the computer.
Hope this helps someone. The oscilloscope costs ~ $ 300, and the burned-out microcircuit is only $ 8.
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