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New bench scope - Fnirsi 1014D, 7", 1GSa/s

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joseph4511:
i do not think they have such a vision for this particular protection. Peter managed to run the software discarding lines which related to that chip.

pcprogrammer:
Hmm, it should show a screen like what you see in this video:  https://youtu.be/h-tdKPDocHI

I'm beginning to think that there is a problem with the FPGA.

joseph4511:
Maybe but how they died without any damage, dropping, heat ?


Edit: Do we have datasheet for FPGA or VCC points ? Maybe it is not getting enough voltage or something else. Because first one died for no reason, i turned off from button and tomorrow morning it died :D

pcprogrammer:

--- Quote from: morgan_flint on May 05, 2022, 06:43:20 pm ---
--- Quote from: pcprogrammer on May 05, 2022, 03:24:13 pm ---
Since there is no idea on which chip they used for this special ic it will not be easy to get to the bottom of it. It is also not needed because I know what the main cpu needs from it...

--- End quote ---

Hello! I've been reading through this thread and came over the "mystery chip" issue, and it remembered me of a similar problem with Jyetech's scopes (DSO150 and DSO138 mini specifically).

Could that chip be an ATSHA204A or something similar?

That is like an I2C EEPROM (in fact, includes 4.5 Kb) but with some crypto authentication features. Jyetech uses it to avoid their firmware running on counterfeit copies of their products, by reading the unique serial number on the chip and checking it against an activation code specific for each serial number. Some more info here and previous posts.

Maybe FNIRSI is using a similar approach, or just including the chip in case they detect counterfeits in the future (the initial versions of DSO150 ran on counterfeits also until Jyetech started to include the activation code)

--- End quote ---

No it is nothing of that kind. The main processor sends data to the chip and it in turns sends some altered data back. I have no idea why they choose this solution because the main processor can do this altering of the data itself without all the overhead and errors the communication causes.

pcprogrammer:

--- Quote from: joseph4511 on May 05, 2022, 06:49:26 pm ---Maybe but how they died without any damage, dropping, heat ?

--- End quote ---

The special ic is connected to the FPGA and it might caused damage to it when that first special chip died. Did you try both chips with your USB to I2C interface? I'm curious to see if both are actually dead.

Tomorrow I will take another look at the code to see if I can find a point where it might hang. The processor and the screen are working because the startup image is being displayed and the FEL mode is working.

You having the FEL mode now makes it a bit easier to have you do tests on your boards.

If the FPGA is damaged it is possible to replace it since we know it is an Anlogic AL3-10. Not sure if it is easy to get one. Aliexpress does sell boards with them. https://fr.aliexpress.com/item/1005001774923333.html

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