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
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
Well, you found it the hard way...
For anybody interested here is
How NOT To Blow Up Your Oscilloscope!
Last edited by rideon; 14th April, 2016 at 06:45 PM.
A failure will not appear till a unit has passed final inspection
I connect only gnd to gnd... but also my usb hub demaged. Not know if problem was in hub that demaged usb oscilloscope too
A failure will not appear till a unit has passed final inspection
Meat-Head (24th November, 2018), phanminhnhat (23rd June, 2016)
You can try to read with jtag. 2016-06-23_103330.jpg2016-06-23_103448.jpg
rideon (27th June, 2016)
Hi!
Are you repaired your scope?
If yes, any sharing pls?
Thanks.
I need dump for mcu. Still not found
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..
A failure will not appear till a unit has passed final inspection
This's my hantek S/N
Hantek 1008c.jpg
And dump in attachment.
Good luck!!!
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.
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
Last edited by ziko; 24th November, 2018 at 05:14 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
A failure will not appear till a unit has passed final inspection
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
Last edited by ziko; 25th November, 2018 at 02:44 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....
Last edited by rideon; 25th November, 2018 at 06:29 PM.
A failure will not appear till a unit has passed final inspection
Meat-Head (27th November, 2018)
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
Last edited by ziko; 26th November, 2018 at 02:57 PM.
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