EEVblog 1520 - Troubleshooting a Faulty BM786 Multimeter

[Kean]

Around the 2:54 mark in the second video, 1522, you mention a content creator who has multi-series troubleshooting videos. Can you share that name again. I've tried searching based on what I think you said but haven't found them. This was right after mentioning Joe Smith.

That would be Defpom
https://www.youtube.com/channel/UCllpBTH26_dAl5tYl7vA1TQ

[NoMoreMagicSmoke]

And there is a history of BM235 chips just failing.

Is this an issue specific to the BM235 chipset? Or is it a problem with the Hycontek processors in general? Have you seen many failures in the BM786 related to the processor?

[EEVblog]

And there is a history of BM235 chips just failing.

Is this an issue specific to the BM235 chipset? Or is it a problem with the Hycontek processors in general? Have you seen many failures in the BM786 related to the processor?

There have been odd failures were the chipset appears to be the culprit, but not confirmed by Brymen.

[Phil_A]

I just saw this video.  I think the U1 "microcontroller" you are pointing to is actually the HY3131 DMM front end (48 pin).  The NCs pins seem to line up.   The pins you pointed to are AGND, REFO and VSSA on the front-end. The location of Xin/Xout seem correct and the HY3131 spec sheet specifies that 4.9152 Mhz Xtal.  Perhaps U16 (64 pin) next to the buzzer is the microcontroller?   Maybe U16 is a HY16F 32bit microcontroller? - Phil