Need help in order to repair my flight controller board

[CuriousGeorgeWantsToKnow]

After a crash and during the removal of the IMU box, I believe I have knocked off a couple ceramic capacitors that I am having trouble figuring out what to replace them with. I attempted to do my research from this page here but was unable to figure out what page to look at and the page that was supposed to be the flight controller didn't make much sense to me.

o-gs/dji-hardware-schematics

I have attached a couple photos of the missing two capacitors that I can see, if anyone notices anymore please let me know. It looks like one of the capacitors the one marked with a red arrow just needs to be placed back into place.

This was the page I used as a referance for photos of a good flight controller board.

o-gs/dji-firmware-tools

Good Board

My Damaged Board

[ATT]ACH=full]100542[/ATTACH

 

[quaddamage]

Yeah, the schematic there is barely started... major components are there, but no connections.

Layout is incomplete as well:

Ph3 Fc layout

• quaddamage
• Jun 29, 2018

Screen shot of the project...

Anyway, you need someone to measure the resistance of these. Then you can check the resistance with these components missing, and the difference will be what you need to put there. I am quite busy recently so I hope someone else has a multimeter.

 

[With The Birds]

Yeah, the schematic there is barely started... major components are there, but no connections.

Layout is incomplete as well:

Ph3 Fc layout

• quaddamage
• Jun 29, 2018

Screen shot of the project...

Anyway, you need someone to measure the resistance of these. Then you can check the resistance with these components missing, and the difference will be what you need to put there. I am quite busy recently so I hope someone else has a multimeter.

Are you sure? Any resistance measured with the resistor absent will be higher than with it installed- it must be given the missing component will be in parallel with whatever load is present across the pads on the PCB.

 

[quaddamage]

Are you sure? Any resistance measured with the resistor absent will be higher than with it installed- it must be given the missing component will be in parallel with whatever load is present across the pads on the PCB.

I assume @CuriousGeorgeWantsToKnow knows how to add (or subtract) resistances in series.

 

[With The Birds]

I assume @CuriousGeorgeWantsToKnow knows how to add (or subtract) resistances in series.

Ok- that being the case your suggestion as to how to arrive at the required value for the missing component is wrong. He isn't dealing with a potential series connection at the test point. The missing resistor will be connected in parallel with whatever value he measures with it out of circuit.