hantek 1008c usb oscilloscope

**ziko** · 14th April, 2016, 03:22 PM

Hi

I just touched probe gnd to gnd of pcb that was testing and usb disconnected. After no more ding/dong when connect to usb and no led on
I found 3v3 regulator damaged and also mcu STM32F103C6
Any chance someone to read with jtag mcu?

Tnx

**rideon** · 14th April, 2016, 06:20 PM

Well, you found it the hard way...
For anybody interested here is
How NOT To Blow Up Your Oscilloscope!

**ziko** · 14th April, 2016, 07:37 PM

I connect only gnd to gnd... but also my usb hub demaged. Not know if problem was in hub that demaged usb oscilloscope too

**rideon** · 14th April, 2016, 07:57 PM

Originally Posted by ziko

I connect only gnd to gnd...

Is called ground loop ,and IF everything IS grounded then you got no issues
Better to be safe than sorry, next time use the scope on a laptop running on battery,is the easiest/cheapest way to stay out of trouble..

**phanminhnhat** · 23rd June, 2016, 04:37 AM

Originally Posted by ziko

Hi

I just touched probe gnd to gnd of pcb that was testing and usb disconnected. After no more ding/dong when connect to usb and no led on
I found 3v3 regulator damaged and also mcu STM32F103C6
Any chance someone to read with jtag mcu?

Tnx

You can try to read with jtag. 2016-06-23_103330.jpg 2016-06-23_103448.jpg

**jodank** · 23rd July, 2016, 11:21 AM

Hi!
Are you repaired your scope?
If yes, any sharing pls?

Thanks.

**ziko** · 1st August, 2016, 07:20 PM

I need dump for mcu. Still not found

**rideon** · 1st August, 2016, 08:27 PM

Can't help with a dump...
Still, if a ground loop fried your device the mcu should survive...
on sigrok.org is mentioned Low-dropout voltage regulator: Advanced Monolithic Systems AMS1117-3.3 try checking that and the capacitors around that..

**phanminhnhat** · 4th September, 2016, 06:21 PM

This's my hantek S/N

Hantek 1008c.jpg

And dump in attachment.
Good luck!!!

**krzr** · 11th December, 2016, 03:10 AM

How i can download this dump to my oscilloscope? Which programm i should use for that? My oscilloscope doesn't work, when i connect him to my computer, it connect and then disconnect the connet and then disconnect. I think this problem in microcontroller. I want to renew firmware. Could you help me? I write it from Russia. Please help.

**ziko** · 24th November, 2018, 02:52 PM

Hi, I put hex to new mcu, now sw recognize hw but measurent is not works on any channel. Reference 1KHz signal is ok (measured with other scope)
Any tips?

All 8 channels not works, as I see all chaneel has
74hc4051d
TI29AVG 8 pins not know what IC is this
HC595 cmos 3 pcs
and MCU

As I see common part for all 8 channels is MCU only, So not know if data is ok or .... something else

**rideon** · 24th November, 2018, 08:24 PM

Take a look at this link

The only difference i see is they have "TI 25 AVG" and yours is "TI 29 AVG"
As they mentioned, that must be some kind of opamp used in the frontend of all 8 channels
- Chinese low cost replacement with their own markings-

Poke a multimeter at that pcb and check if 74hc4051d has power
Took a look at the pictures on sigrok site .. U427,L403,C401,D406 form a boost converter
Check the voltage in that area if your board is similar...
I might be wrong ,in that area is a testpoint TPVEE that might be the power for the frontend

**ziko** · 25th November, 2018, 02:15 PM

L403,C401,D406 are ok, +5v comes to IC smd code LTRA = LT1931.
By datasheet it convert +5v to negative -5v (by other component I see and sch from datasheet) but there is no -5v on output pin
Also all 74hc4051d and othewr CMOS ics have 1.5v, what's is not good, 5v expected... and cant find where from get those +5v (not from usb)
I tried shotrly to bring +5v from usb power to those cmos, patern is goes streight but still not work

Yes, on PCB exactly like sch from datasheet
And when follow pcb track that -5v needed for all TI29AVG 8 pins OPAMP
Thats must be problem, but where to find this LTRA = LT1931?? Maybe inside some HDD
And also problem power for cmos ics

**rideon** · 25th November, 2018, 05:52 PM

Using Meat-Head's crystal ball ...
The opams(TI29AVG) need -5 GND +5 to operate
To fix the negative rail you need another scope..
Scope the input of L1B ...

74hc4051d don't need negative rail ,that part should work on usb power,
maybe there is some diode gone open circuit or some caps gone short...

Near the USB plug are 2 diodes D5 must be good if LT1931 got power,you need to check D8
Hantek_1008C_pcb_top.jpg

By the look of the back, i bet that most of the power traces are there...
Done editing...
ziko, You realize that after you find what parts are needed,order/pay/fix the damn pcb,
The time and money aren't worth it....this one is for educational purposes only....

**ziko** · 26th November, 2018, 01:36 PM

No any activity on L1B (I use other autoscope, maybe no fast enought for this aplication)... I made my own negative 5v with ne555, put short6 from +5vusb diode to CD.... ICs vcc and work... now must order LT1931 and find VCC problem to CMOs ics
Thanks for helping