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Diskussions- und Newsboard des DARC-Ortsverbandes I40  |  allgemeine Kategorie  |  mcHF Projekt Deutsch / English (here you can discuss everything related to mcHF) (Moderators: DF8OE, DL1PQ)  |  Topic: Solved, Bad MCU??? <- zurück vorwärts ->
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WD8BXS
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Solved, Bad MCU???
« 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
« Last Edit: 12. December 2018, 03:06:40 by WD8BXS » Logged

Thanks,
De WD8BXS vy 73
DL8EBD
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Re:Bad MCU???
« Reply #1 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.

« Last Edit: 11. December 2018, 06:00:36 by DL8EBD » Logged

bitte keine technische Fragen oder Diskussionen via PN, dafür ist das Forum da.
vy73
Thomas
WD8BXS
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Re:Bad MCU???
« Reply #2 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
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WD8BXS
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Re:Solved, Bad MCU???
« Reply #3 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
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De WD8BXS vy 73
DL8EBD
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Urgestein
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Re:Solved, Bad MCU???
« Reply #4 on: 12. December 2018, 04:24:40 »

Congratulations!
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bitte keine technische Fragen oder Diskussionen via PN, dafür ist das Forum da.
vy73
Thomas
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