Hi, I was desoldering the chip when 2 SMD capacitors (C12 & C11) were accidentally removed. Could anyone identify them so I could get the correct replacements?

Are they between VDD (3.3V) and GND? Or where are they connected?

I replaced C12 & C11 with the same size SMD capacitor salvaged from another PCB, and openbk now boots up normally.All working except I can't trigger relay 3 with button 3 (bottom left). I think I might need to get the correct SMD capacitor for C11

Yes, but where are they? If they are on VDD, then they are really, really non-critical. Those are just decoupling caps. I'd put a 100nF and 10uF there to be sure, but really any similar values would do great. If you are worried about power supply, then you can enable PowerSave on OBK. Which GPIO line controls relay 3 and button 3? Can you toggle relay 3 via Web app? OBK buttons are working without capacitors, debouncing is done in firmware.

Identification and Replacement of SMD Capacitors (C12 & C11) on 4 Gang Switch PCB

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#1 20689222 10 Aug 2023 20:19

ferbulous ferbulous

Level 18

Post #1
20689222 10 Aug 2023 20:19

Hi, I was desoldering the chip when 2 SMD capacitors (C12 & C11) were accidentally removed.

Could anyone identify them so I could get the correct replacements?
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#2 20689584 11 Aug 2023 07:57

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #2
20689584 11 Aug 2023 07:57

Are they between VDD (3.3V) and GND? Or where are they connected?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#3 20695135 16 Aug 2023 03:25

ferbulous ferbulous

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20695135 16 Aug 2023 03:25

p.kaczmarek2 wrote:
Are they between VDD (3.3V) and GND? Or where are they connected?

I replaced C12 & C11 with the same size SMD capacitor salvaged from another PCB, and openbk now boots up normally.
All working except I can't trigger relay 3 with button 3 (bottom left). I think I might need to get the correct SMD capacitor for C11
#4 20695187 16 Aug 2023 08:00

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #4
20695187 16 Aug 2023 08:00

Yes, but where are they? If they are on VDD, then they are really, really non-critical. Those are just decoupling caps. I'd put a 100nF and 10uF there to be sure, but really any similar values would do great. If you are worried about power supply, then you can enable PowerSave on OBK.

Which GPIO line controls relay 3 and button 3? Can you toggle relay 3 via Web app?

OBK buttons are working without capacitors, debouncing is done in firmware.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
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