DSO068 works but the Adj button and buttons do not work!

[yanzappa]

The problem is similar to me[like this post viewtopic.php?f=16&t=685&start=30r]. I bought a KIT from ebay [https://www.ebay.com/itm/113152229754?ul_noapp=true] - seller (melisocy2017). I did the relevant checks quoted in this post - everything is right. My conclusion is that the U5 is bad - it works unstable, when the pin 29 is reset, the oscilloscope goes out. once time worked, 10 times not worked.
Video here: https://youtu.be/XdeITBGOcxc

As seen on the second video voltage U4 e -3V, not 1.6V - definitely U2B e is bad. I ordered several pieces of aliexpress - I will replace it myself.
Video here: https://youtu.be/AVbDQ3Q0pu8

The problem for me is U5 - I need a programmed chip. I hope we can sort out the problem.

I exchanged messages with the seller - can not help me. I suggest that I repair it myself and he would restore my cost

Greetings,

P.S. I apologize for my bad English

[yanzappa]

Hello, what's up, will not you guess where the problem is. Is Atmega48? When attempting to read with the Khazama AVR Programmer and USBASP, it states that the chip has the wrong signature - 0x1e920a instead of 0x1e9205.

I also want to ask the developers (JYE Tech) of the DSO068 device, whether what is sold on ebay are theirs or clones.

Please someone at who the oscilloscope works normally to share V5 what value is it?

[jye1]

Can you post photo of your board? Sorry we are unable to open Youtube since it is blocked here.

[yanzappa]

I presoldering the pins of U5. I also mentioned that avrupd can not connect to the chips.
the device is appears in device manager.

[jye1]

Thank you for the photos. The boars looks genuine.

U5 can only be programmed by programmer (AVR programmer like USBASP). It is not accessible via AVRUPD. But if your board was not working from the very beginning JYETech will replace it. Please contact us at jyetek@gmail.com.

[yanzappa]

Thank you for the photos. The boars looks genuine.

U5 can only be programmed by programmer (AVR programmer like USBASP). It is not accessible via AVRUPD. But if your board was not working from the very beginning JYETech will replace it. Please contact us at jyetek@gmail.com.

Thanks for the reply. I'm sending you an email. In fact, when the test 2 was checked, the buttons did not respond. When they are repeatedly restarted, they sometimes respond, but they do not respond the next time.
I tried to read the USBAVR and eXtreme Burner - AVR

and Khazama AVR Programmer chips.