In my DJI mini 3 pro i i have some missing parts due to an accident, i dont have fresh care and this problem not under the guarantee, So I want to try to solve this problem myself. But I can't find any map for this electonic circuit to find the missing parts .


if anyone can help me to find solution .

Hi there, it is highly recommended to send back for comprehensive check to ensure the long-term usage. You could contact with the local service center for further assistance, thanks.

Dear, my local service said for me i should to change the motherboard and ask for about 350$ and my only problem is this 4-5 composents , when i am cleaning my drone with teeth brush i removed by mistake then i can't turn on my drone .

Even if you could get a schematic, those are all surface mount components and, unless you have the required tools and experience, can be very hard to replace on that circuit board.

ShadowyMan Posted at 11-13 11:24
Even if you could get a schematic, those are all surface mount components and, unless you have the required tools and experience, can be very hard to replace on that circuit board.

i technician will be change this for me , just he need the schematic to know what is the parts required .

Dirty Bird Posted at 11-13 19:08
Out of curiously, why were you cleaning the circuit board with a toothbrush?  Must have been quite an aggressive brushing to scrub off soldered chips.  A bit of dirt on the circuit board should not have affected flying the drone.

yes , my little son dropped a cup of water on the drone. Without thinking, I struggled to open it and try to clean it randomly. Then I discovered that some pieces flew off

Something very odd going on here. There is no way in hell a toothbrush could knock those components off the board.
Maybe you gouged them off with your screwdriver while opening it up, but there isn't the usual scratch marks on the board from a miss guided screwdriver.

Neslihan Posted at 11-14 17:48
yes , my little son dropped a cup of water on the drone. Without thinking, I struggled to open it and try to clean it randomly. Then I discovered that some pieces flew off

Leave it to the experts

Lieutenant Posted at 11-14 20:18
Something very odd going on here. There is no way in hell a toothbrush could knock those components off the board.
Maybe you gouged them off with your screwdriver while opening it up, but there isn't the usual scratch marks on the board from a miss guided screwdriver.

This is what happend exactly after the water . for that when i clean it the composant has been removed .

It's still surprising that a glass of water could smoke a board like this, at least I don't believe it.  It looks more like a power surge.

LV_Forestry Posted at 11-16 08:50
It's still surprising that a glass of water could smoke a board like this, at least I don't believe it.  It looks more like a power surge.

I can only guess it was switched on at the time, and the water caused short circuit.
That's burnt and it looks like component damage before the toothbrush.

Sam654 Posted at 11-16 11:35
I can only guess it was switched on at the time, and the water caused short circuit.
That's burnt and it looks like component damage before the toothbrush.

I have never seen such damage on boards exposed to water.  But why not.

Neslihan Posted at 11-16 08:43
This is what happend exactly after the water . for that when i clean it the composant has been removed .

[view_image]

I sincerely doubt that you or any technician will be able to fix that on the cheap...

DJI buys their components and complete board, from other company. Even if you take the board out and find the maker and revision number, no one will give you the schematics for it...

DJI purposely removes and rebrands chips on their board to avoid other Chinese company from gaining on them...

Even if you find out what they are and replace the few burned components, you still don't know the true extent of the damage... It may work today, it may stop again tomorrow.. You have quite few diodes and transistors burned on that board, and without schematics, you can only guess where and how far the damage went...

The best and cheap solution would be to buy on Ebay another drone and swap the boards...

Not sure if it will come cheaper than $350, but your problem is not "4 or 5 components" like you mentioned... When the liquid did hit the board, you really don't know where the power went. You are only assuming that based on a visual inspection... That's not the way to assess the real damage...

Neslihan Posted at 11-16 08:43
This is what happend exactly after the water . for that when i clean it the composant has been removed .

[view_image]

This board is toast beyond repair. The first photograph looked a lot less harmed, I suppose you did switch the unit on again and then the big damage occured. This is beyond repairablity, has to be swapped out. I think best way is to send it to DJI for repair, they do not charge a fortune for their service.
I develop electronics for some 30+ years now and this foto shows burned FR4 PCB composite, not fixable, especially I would emphasize you to never let this material up in the air again, it may pose a high risk of failing mid air.

The second picture is when I put the battery in and tried to turn it on after the water entered. The first picture is when I cleaned it with a toothbrush. I know that damage has already occurred in these components, especially since when I lost several components, I could no longer know what to replace them with.