New Hantek DSO2X1X models?

[nokin]

I found the cause of front usb problem, came from the Sany Oscon caps which I added in 5V digital supply. Don't know why but removing them makes usb stable again.
Test 3 times with and without these caps I can confirm the cause.
Now I replaced with Nichicon FW.

[masta_k74]

Where did you buy the caps? I currently have a problem with two photodiodes "BPW24R" from AliExpress. Both from the same seller there. They are definitely not photodiodes, not even normal diodes, but simply empty housings. There is no measurable value, no diode path, no resistance, no voltage when irradiated with light, nothing. It seems to me that there is a growing problem with fake components. Unfortunately, I have had the photodiodes here for a long time and can no longer complain about them. Unfortunately, I was stupid enough to trust the seller and did not check them immediately.

[Russ3000]

I put the batteries in, glued everything to the front panel, it works fine, there is no noise at all.
I had to put resistors on the 2x9 output, the block did not start at a large input capacitance 7805 and 7905

An open probe at maximum sensitivity, I did not expect this.

[nokin]

Mine was bricked last night, I think no way to recovering.
The osc can boots then hangs, no response from any key and NO TRACEs !  Front input area are quite hot when I touched the shields. Don't know why.
Everything was ok before. I checked again volts at all test points on mainboard are ok for both analog and digital section.

Win11 could see the rear usb plugged in FEL mode but cannot install driver (winusb).

[DavidAlfa]

Why can't you install the driver?
Check out the Automated driver installer.

[nokin]

Thanks DavidAlfa, I will try and report later.
Something wrong in front input section, they quite hot on shield's surfaces. No traces on lcd.

[nokin]

 I got mine from damaged genuine audio board. I think oscons are best for digital decoupling but not for usb devices related. This is the 2nd time I met this problem. Last bug was PCIe to usb 3.0 card on my music server, the computer even not recognize Amanero board.
$

Where did you buy the caps? I currently have a problem with two photodiodes "BPW24R" from AliExpress. Both from the same seller there. They are definitely not photodiodes, not even normal diodes, but simply empty housings.

[masta_k74]

You say the input area on the front panel gets very hot? Have you checked all three voltages? If something has gone wrong with the power supply due to the changes, that could well be the case. Above all, it doesn't have to happen immediately. I would check this first, before a voltage that is possibly too high destroys everything.

[nokin]

Hi DavidAlfa,
I've tried many times on both win 10 vs win 11, even win 10 never ever plugged osc before, but same problem with driver installing.
Tried zadig driver it was installed successful but Device manager still showed Unknown Devices #1. Restore.bat still "waiting for any devices"

Why can't you install the driver?
Check out the Automated driver installer.

[nokin]

Yes, until now 2 shields still hot (or warm). 7v and 5v rails are ok. I've measured on 4 test point dots on mainboard.
Quite strange but I don't know what happened. Maybe these front input shortened but cannot happened for both channels.

You say the input area on the front panel gets very hot? Have you checked all three voltages? If something has gone wrong with the power supply due to the changes, that could well be the case. Above all, it doesn't have to happen immediately. I would check this first, before a voltage that is possibly too high destroys everything.

[nokin]

Opened shield covers, I see U27 and U24 very hot. So problem are here but what happened before I really don't know.
Maybe these ICs were shortened circuit.

[DavidAlfa]

Strange, I've tested it in both win7 and win11.
What about manual Zadig installation?

[nokin]

Driver from Zadig was installed successful but comp still doesn't see Hantek FEL, just only Unknown device #1 below Usb host tree.

[masta_k74]

U24 and U27 are supplied by the 7805 on the main board, which sits at the back of the signal generator directly near the connector where the Dual 8V go to the main board.
So from the dual 8V for the analogue part of the oscilloscope. Not from the +5V for the digital part.
Check the voltages on the 7805 there. I suspect something is wrong there.

[nokin]

Yes I knew it. I looked at schematic before.
Now I have to de-soldering U24 U27 and check it again.
Volts on every test point is ok. Look like electrical shock from power board when the osc was powered on last time.

[masta_k74]

Look like electrical shock from power board when the osc was powered on last time.

That's exactly what I think.

According to the LMH6702MA (U24 & U27) data sheet, a maximum of ±6.75 is permissible. (Absolute maximum ratings)
With 5V, this is close to its limit for an operational amplifier. I only know of operational amplifiers with a wider voltage range.

I've learned something new again.

[DavidAlfa]

Sometimes it keeps the "unknown device" name, but if it appears correctly (Without any warning sign) it'll be ok.

[AlexGeForce]

DavidAlfa,
Tell me, please, have you ever encountered such a defect and is there any way to defeat it?
I have a DSO2D15 oscilloscope right unpacked "out of the box" by pressing the "Help" button after a few seconds it hangs tightly. At least I and another user of Dezmond 2 had this defect

After carefully reading the branch and your posts on Eevblog, I, just in case, made all the necessary backups (both through DSO Flash and through Backup Builder)
In my instance DSO2D15 Software. 1.0.2.0.0.(221028.00)
FW 3205
Board version DSO2D15_V1.7 2021.1.14

[Russ3000]

You need to write to the developers on the forum

https://www.eediscuss.com/forum.php?mod=viewthread&tid=17227&extra=page%3D1

[AlexGeForce]

Thanks. Reported to the DSO2D15 discussion

https://www.eediscuss.com/forum.php?mod=viewthread&tid=17269&extra=page%3D1

[DavidAlfa]

DavidAlfa,
I have a DSO2D15 oscilloscope right unpacked "out of the box" by pressing the "Help" button after a few seconds it hangs tightly.

- Make a backup with Backup Builder.
- Use Platform-tools to restore a fresh filesystem.
- Restore your dso3kb_CNxxxx.upk backup (Not "FULL").
- Apply latest update.
- Calibrate.
- Done.

[nokin]

Look like this Hantek for modding and relaxing or angriness (if anyone meet hardware problem as me) not for measuring 

[nokin]

HARD-BRICKED RECOVERY REPORT 

My scope was alive last night after many effort in hardware and software related recovery
1. Replaced 2 Opamp U24+U27 by AD797 smd (temporary). Scope was booted ok but hung as before.
2. Install Adb fastboot device driver (the most important step after FEL driver)
3. Platform-tools to restore filesystem
4. Update fix and lastest fw
5. Restore backup (any backup upk) but showed red error code -3 (DavidAlfa pls help me... )
6. Calibrate ok
7. Scope was rescued. Test functions and accuracy ok.
8. Test bandwith, limited ~ 4-5MHz due to AD797's bw but for audio hobby it's still ok.
9. Replace LMH6702MA later if I find any genuine parts.

[DavidAlfa]

Err -3, probably bad UPK, corrupted after removing the drive.
Put UPK files at the root of the usb Drive.
You can also use folders, but can't have spaces or it will fail.
Always use safe USB drive extraction method.

Don't use any Backup if not yours, doesn't make sense.
If not having your own backup, follow the README instructions in Platform-tools to restore your model/serial.
If you have wave generator, calibration will be lost, run calibration tool (In FAQ).

Ensure to read the FAQ!

[masta_k74]

9. Replace LMH6702MA later if I find any genuine parts.

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