Identify missing component in phone front camera subcircuit

[NeoxSys]

Hi everybody! I'm trying to identify a missing component from my mobile phone board. The whole phone works properly except from the front camera. The component was lost accidentally when I disassembled the device to replace the display. The phone does not recognise the camera, as if it wasn't conected to the board. Let's have a look:



It belongs to the front camera subcircuit. As you can see in the image, it is a tiny SMD component with 4 contacts. I would say it may be a kind of FET but since I don't have the schematics diagram of the phone I'm not really sure. What do you think it could be? What kind of components are likely to be used in the phone camera's circuit?

My other option is to disolder the other two components below this one, since they seem identical, and measure them to see what they are. But due to the difficulty this is my last alternative.

The phone is a BQ model X5. I haven't found its schematics yet.

Thanks for your help.

[daveshah]

Looks like it might be some kind of EMI filter on the cameras differential signal lines. If you're willing to take a risk I think you might be able to replace it with two 0R resistors of the correct size - or solder bridges - placed horizontally.

Edit - three devices in total makes this possibility even more likely as 2-lane MIPI CSI would be a common choice for a lower resolution front camera; and would have 2 data pairs and a clock pair

[NeoxSys]

Looks like it might be some kind of EMI filter on the cameras differential signal lines. If you're willing to take a risk I think you might be able to replace it with two 0R resistors of the correct size - or solder bridges - placed horizontally.

Thanks, I will consider taking the risk if no one comes with a better solution. By the way, in the case you are right, what would be the consequence of not having that filter?

Edit -

three devices in total makes this possibility even more likely as 2-lane MIPI CSI would be a common choice for a lower resolution front camera; and would have 2 data pairs and a clock pair

It is a 5Mpx camera. I have an oscilloscope to make measurements, what do you suggest me to do?

[daveshah]

The consquences of not having the filter are slightly increased EMI emissions - unlikely to be a big issue; although I suppose it could reduce GPS/cellular performance. If you want to replace it properly have a look for common mode chokes of the correct size.

I don't think an oscilloscope will be that useful, the easiest check to do would be to measure which - if any - pins are shorted or low resistance to each other with a multimeter.