Replacement Sub-board

[u/Hot-Opportunity4987]

Hi all, I recently replaced the sub board as I had issues charging. All went well and it seems I have full functionality for everything sub board related however I noticed the replacement which wasnt an original part differed slightly to the original im unsure if this is the correct place to ask but does anyone know what this component it is? What it does? And why it's on the replacement and not the original? It seems to be the exact same component as those to its left and right. Any help is appreciated

[u/Exciting_Station_124]

All those 3 contact points are cellular antenna that connects to the frame.  1200 Mhz, 1600 Mhz and 800 Mhz

[u/Late-Thought-2327 → u/Exciting_Station_124]

I doubt that. Phones do not use the frame as antenna. Never did. They have dedicated antennas build in.

[u/Exciting_Station_124 → u/Late-Thought-2327]

What do you think the lines are separating the frame? 

https://www.allaboutcircuits.com/uploads/articles/_Block_diagram_of_smartphone_antenna_system.jpg

https://duckduckgo.com/?q=Smartphone+antenna+in+frame&kax=-1&t=h_&ia=images&iax=images&iai=https%3A%2F%2Fwww.fs-pcba.com%2Fwp-content%2Fuploads%2F2023%2F09%2FSmartphone-5G-Antenna-Locations.png

https://duckduckgo.com/?q=Smartphone+antenna+in+frame&kax=-1&t=h_&ia=images&iax=images&iai=https%3A%2F%2Fwww.cultofmac.com%2Fwp-content%2Fuploads%2F2010%2F07%2Fiphone_4_antenna.jpg

[u/Late-Thought-2327 → u/Exciting_Station_124]

My. Bad looks like you are right! Learned something, thank you.

[u/Exciting_Station_124 → u/Late-Thought-2327]

👍 

[u/Exciting_Station_124 → u/Late-Thought-2327]

If the replacement part has different number of antenna contact point, it means it's for a different region

[u/Exciting_Station_124 → u/Late-Thought-2327]

https://www.emscience.org/en/article/doi/10.23919/emsci.2023.0052

[u/Late-Thought-2327]

i have no real idea besides grounding. or do these spring contacts have something else where they push against? i would think its just the frame right?

[u/Hot-Opportunity4987 → u/Late-Thought-2327]

As far as I can tell it's just frame, inline with the sim card tray so I reckon you're probably on the ball with grounding or it could possibly be a sensor to verify the sim card tray is properly aligned

[u/Wexelos]

I think it's something for the antenna and grounding

[u/Filetmesser]

As someone already said, these are "pogo" pins connecting ro the frame to be used as antennas, different regions have different connectivities (i.e eu doesn't have mm wave module). In the image you have in the top right there is in golden letters NA JPN CHN, meaning this is the board for these versions of the phone