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allgemeine Kategorie => mcHF Projekt Deutsch / English (here you can discuss everything related to mcHF) => Message started by: WD8BXS on 11. December 2018, 02:20:34

Title: Solved, Bad MCU???
Post by: WD8BXS on 11. December 2018, 02:20:34

Have a version six that says SI570 not found.

Replaced 570, and U10 same result.

Checked with scope and can trace signal from SI570 all the way to the mcu pins 92,93

All looks good. Could the MCU be faulty??

de Chuck

Title: Re:Bad MCU???
Post by: DL8EBD on 11. December 2018, 05:56:26

Hello Chuck,
what does the I2C bus look like? Clean signal or slurred?
Are the capacitors C38 and C39 mounted (RF board)? -> in my opinion, they do more harm than good.

Please check all solder joints on Si570 again!

Quote:

Could the MCU be faulty??

then would be no communication on the I2C bus.

Title: Re:Bad MCU???
Post by: WD8BXS on 11. December 2018, 18:20:59

I tried another UI Board and it works just fine, so the problem IS in the UI Board.

Re-loaded bootloader and firmware, but no change.

next step is to replace MCU.

Out of ideas!!

Thanks.
de Chuck ??? :'(

Title: Re:Solved, Bad MCU???
Post by: WD8BXS on 12. December 2018, 03:08:35

Found bad solder at another pin, not sure why that caused the error, but it works now!

Thanks,
Chuck

Title: Re:Solved, Bad MCU???
Post by: DL8EBD on 12. December 2018, 04:24:40

Congratulations!