hantek DSO4254B

[Wagner]

Hello, my English is poor, so I used a translator. I made a mistake and accidentally injected 24VDC into the calibration input of my Hantek oscilloscope, model DSO 4254B. After that, it wouldn't turn on anymore, the buttons remained lit and the screen was black.

I tried contacting the manufacturer for help, but received no response.

I'm requesting an electrical schematic from my friends, since the protection diode on the calibration input shorted out. I may have an electronic defect or firmware corruption. Reading the posts, I noticed that other models have a way to replace the firmware using the SD card slot, but I haven't been able to find the necessary files for that.

Please help me save my equipment.

Thank you.

[Aldo22]

Ask zhangqiang@hantek.com

[Wagner]

No response so far, nor have I received confirmation of receipt or reading...
Does anyone in the group have the files to try restoring it using a micro SD card? Apparently, even the USB ports don't work. I'm starting to believe the microprocessor has failed. But without an electrical schematic, it's difficult to know anything.
I have a clock and the RTC oscillator is working, and the power supply voltages seem to be okay...

[Phil1977]

If you damaged the scope by overvoltage, the chances of successful restore by SD-Card appear to be small.

Where did you check the supply voltages? Do you have a thermal imager available?

If the CPU is fried then probably the best way is to look at ebay for a unit with broken display and replace the whole PCB.

[Wagner]

Yes, it was due to an accidental overvoltage at the calibration input. Since I don't have the electrical schematic, and the board is multilayer, it's difficult to trace the tracks. But since I don't have the electrical schematic and haven't been able to get it, I'm kind of stuck.

The power supply and regulator voltages are within expected limits. All voltage markings on the silkscreen are correct. For those that aren't, I checked the regulator datasheets and they are also within nominal values.

I took a thermal image; there's a hot spot on the CPU enclosure. The ADC has a heatsink and it's hot, but within the limits of the datasheet.

I'm still trying to find an electrical schematic to get a definitive answer. This happened in December, and since then I've been looking for a solution. To keep the lab running, I bought a new Rigol DS1104Z-S, but I'd like to repair this Hantek.

If anyone in the group has the electrical schematic for the 4004B family, it would be very helpful.

I didn't find any new or used boards on eBay. I found a used piece of equipment in poor condition, but in conversation with the potential seller in Russia, he didn't... I would send the device...

I know it's not a cutting-edge piece of equipment, but it adequately meets my needs.

What saddens me is that Hantek hasn't even responded... it doesn't matter if they have the board to provide me or not, but at least give me an answer...

The minimum they could do would be to provide me with the files to reprogram the CPU, since replacing it isn't difficult... finding it isn't either, as several suppliers have "virgin" versions; it would just require replacing the processor and reprogramming the firmware...

I tried communicating via the device's USB port...

Now I'm exploring the possibility of communicating via JTAG, but again, no information is available... and the only possibility I saw on the PCB is that components are missing. I know it could be protection circuits or pull-up or pull-down switches, but I could create even more problems...

[Phil1977]

It´s really rare that manufacturers supply you with firmware files for their devices if there is no "official" update procedure 

[Wagner]

So, in another post, same brand, different model, they sent the customer files to update via the internal micro SD card slot on the device...

I've been requesting the electrical schematic and files for this same procedure from them since December...

[Wagner]

Hantek isn't responding at all—neither regarding the schematic nor the files... I don't think there's any way to recover the instrument.

 

[Wagner]

isn't responding