New 2ch pocket DSO+SG - Zeeweii DSO2512G

[ptluis]

Problem is random whith or without singnal may work 5 may 15 minutes/

Try to check battery voltage or any component overheating, I had something similar problem with a v3 firmware version unit and it was in fact a battery problem. I had the unit replaced.

[Panchez]

Change battery, same result, not overheating any elements, processors and ADC heat around 37-38C, other element are cold. 

[ptluis]

Change battery, same result, not overheating any elements, processors and ADC heat around 37-38C, other element are cold. 

Try a factory reset through the menu like this: press MENU button then choose SET option, while on SET menu option  long press AUTO button until you hear a bip or read a message on screen. after that turn off the scope and back on. test it.

Did you contact Zeweeii as I suggest previously? See if they send you a firmware for you to flash. Try it also through your seller. If you don't insist they won't care just like most of Chinese sellers.

[Panchez]

I washed off the flux on the display cable. Nothing has changed.
I reset it to factory settings several times.

There is progress, I couldn't find anywhere in the instructions how to save the device settings after turning it off. I watched video reviews, I saw it there. I saved the settings from the menu by pressing save. It has been working for 35 minutes without freezing, without sending a signal, while I'm busy I can only observe, closer to the evening I will check everything and write.
Perhaps there was garbage in the eprom.

No one has responded to the letters yet

[ptluis]

I washed off the flux on the display cable. Nothing has changed.
I reset it to factory settings several times.

There is progress, I couldn't find anywhere in the instructions how to save the device settings after turning it off. I watched video reviews, I saw it there. I saved the settings from the menu by pressing save. It has been working for 35 minutes without freezing, without sending a signal, while I'm busy I can only observe, closer to the evening I will check everything and write.
Perhaps there was garbage in the eprom.

No one has responded to the letters yet

settings are automatically saved when you power off the device

[Panchez]

Now I checked, they really are saved when turned off. But it stopped hanging after I pressed save from the menu. Even the save done sign appeared.
I remember earlier I turned on the auto power off after 15 minutes, and after turning it on it was turned off again. Maybe the settings were not saved before.

I've been running it for three hours now, so far everything is fine. I'm testing further

[ptluis]

Now I checked, they really are saved when turned off. But it stopped hanging after I pressed save from the menu. Even the save done sign appeared.
I remember earlier I turned on the auto power off after 15 minutes, and after turning it on it was turned off again. Maybe the settings were not saved before.

I've been running it for three hours now, so far everything is fine. I'm testing further

the save button is to save a screenshot at least with previous versions. If pressing save makes your scope stable at least you have a way to continue using the device, it's better than nothing. The new firmware looks really buggy.

[Aldo22]

The new firmware looks really buggy.

Possibly a not very well tested backport of the DSO3D12 firmware?
http://www.zeeweii.com/support.html

[ptluis]

The new firmware looks really buggy.

Possibly a not very well tested backport of the DSO3D12 firmware?
http://www.zeeweii.com/support.html

Yes it could be. Instead of improving the software they decided to release different versions of pcb/firmware and right now there's so much confusion between the same model, the newest models are less stable than the previous one. In my opinions they took the wrong path.

[Panchez]

In general, after this manipulation, it stopped glitching, I don’t think it’s because of the flux on the cable,

[ptluis]

In general, after this manipulation, it stopped glitching, I don’t think it’s because of the flux on the cable,

concerning flux i had a uni-t multimeter that operates strangely and after cleaning the remains of flux it work flawless, so you don't loose anything in giving the pcb a good clean and better if you own a microscope you could also inspect all solder points, maybe there's a bad solder on some ic. also try to reinsert all cables.

[Panchez]

Today, too, the whole morning has been standing under the signal and working.
I continue to observe

Answer from zeeweii

Sorry we couldn't find the cause of the failure. It's really weird, we've never had anything like this, it's not a software issue, maybe it's the voltage instability causing the MCU pointer error, but I'm not sure. You can try to factory reset the parameters, and if it doesn't work, you should get a refund.
Factory reset method: menu->set, and then long press the "Auto" button.

[Aldo22]

Today, too, the whole morning has been standing under the signal and working.
I continue to observe

Answer from zeeweii

Sorry we couldn't find the cause of the failure. It's really weird, we've never had anything like this, it's not a software issue, maybe it's the voltage instability causing the MCU pointer error, but I'm not sure. You can try to factory reset the parameters, and if it doesn't work, you should get a refund.
Factory reset method: menu->set, and then long press the "Auto" button.

After all, you have received a personal, qualified response from the manufacturer. 
This is probably not a matter of course, even with more renowned brands.
He probably can't say any more than that from afar.

[ptluis]

Today, too, the whole morning has been standing under the signal and working.
I continue to observe

Answer from zeeweii

Sorry we couldn't find the cause of the failure. It's really weird, we've never had anything like this, it's not a software issue, maybe it's the voltage instability causing the MCU pointer error, but I'm not sure. You can try to factory reset the parameters, and if it doesn't work, you should get a refund.
Factory reset method: menu->set, and then long press the "Auto" button.

That's what I advise you to do before, to return the device! where you bought it? If you can't return it inspect all solder joints, why? most of these cheap chinese devices comes with bad soldering. I've solved many problems in the past by checking them.

[ptluis]

Today, too, the whole morning has been standing under the signal and working.
I continue to observe

Answer from zeeweii

Sorry we couldn't find the cause of the failure. It's really weird, we've never had anything like this, it's not a software issue, maybe it's the voltage instability causing the MCU pointer error, but I'm not sure. You can try to factory reset the parameters, and if it doesn't work, you should get a refund.
Factory reset method: menu->set, and then long press the "Auto" button.

After all, you have received a personal, qualified response from the manufacturer. 
This is probably not a matter of course, even with more renowned brands.
He probably can't say any more than that from afar.

One thing I've learned is if a device is defective just return it or replace it with a new one if it has warranty of course. Todays electronics are more closed to repairs, its hard to get schematics or parts.

And problems do exist with other known brands from cheap to expensive.

[Aldo22]

One thing I've learned is if a device is defective just return it or replace it with a new one if it has warranty of course. Todays electronics are more closed to repairs, its hard to get schematics or parts.

Yes, unless it has to do with the firmware, but Zeeweii says that's not the case.

And problems do exist with other known brands from cheap to expensive.

Definitely. It is only slightly less annoying with a cheap device. 

[ptluis]

Yes, unless it has to do with the firmware, but Zeeweii says that's not the case.

That's what they say  if I were the customer I request support and instructions on what test points should I measure. If they really want to help they do it.

[ptluis]

Today, too, the whole morning has been standing under the signal and working.
I continue to observe

Answer from zeeweii

Sorry we couldn't find the cause of the failure. It's really weird, we've never had anything like this, it's not a software issue, maybe it's the voltage instability causing the MCU pointer error, but I'm not sure. You can try to factory reset the parameters, and if it doesn't work, you should get a refund.
Factory reset method: menu->set, and then long press the "Auto" button.

Are you able to always reproduce the problem with the same key sequence or it is random?

[Panchez]

Problem is a random.
It doesn't matter if there is a signal or not, if I press the buttons or not. It's just turned on without a signal and it froze and rebooted. From 1 to 5 minutes, it didn't work longer.
Now it's turned on for hours, I watch the signals, it doesn't froze.

[Atlan]

If 1000 pcs work and one does not, it is cheaper to throw it away than to repair it. Especially at the price of the device.