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Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White.

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Wi-Fi issues, logic board problem?

I have actually two iPhones 4 that have Wi-Fi issues. I don't understand why. I replaced the antenna in the 2 iPhone, the Wi-Fi option is not grey out, but none of them could detect a single connection.

I tested the antenna's in other iPhones and seems to work perfectly. I'm not having any issues and they connect to my connection fast.

So I'm asking if the trouble is coming from the board ?I can't say cause the Phones don't seem to have any damage on the area, and have never been liquid damage.

I restored the iPhones due to that situation to see what it could change.

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I have seen an iPhone with no obvious board damage just have a break in continuity in the wifi circuit on the board. I replaced the component and wifi came back.

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Could you be more specific about this component ? I bet it could be that but I have no idea of which component you're talking about ? (sorry I'm really visual) = )

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i would have to study the schematic for this one, it's been awhile---I remember sourcing the wifi chip from a dock connector of an iPad 1 if that helps--maybe someone has this info handy?

It almost doesn't matter--there probably isn't visible damage to the component, and it is too small to replace without professional microsoldering. I think if you plug this board into a known good housing and the problem persists, then it is a board problem. Send it out for board-level repair and you will be good to go.

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There is no antenna as such on the iPhone 4 - the antenna is the chassis and it works through the long screw at the top of the EM shield covering the LCD/Digitizer connection. On this EM shield there should be a piece of metal that the screw goes through - if this is not there then there is no way the logic board can use the chassis to get a wifi signal.

Ensure that the EM shields on both phones have this metal piece and that the long screw is securely attached.

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That dosen't seems to change anything. Actually, THERE IS a Wi-Fi antenna in the iPhone 4. It is located on the ring speaker. But the shield is in place but dosen't change anything at all. Still having the same issue with my iPhone.

I tried with different shield to be sure, if you were right. But it don't seems too. I'm just thinking the Wi-Fi connector on the logic board is dead perhaps there is nothing irregular with the connector.

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There is a very small metal clip that generally falls off when removing the shield at the top of the board that covers all the connectors. The metal clip makes contact with the long screw at the top and a circle copper pad on the board. If this piece is missing, there will be no wifi. The shield itself serves as the wifi antenna.

I tried solving this problem with putting tinfoil on it when I lost the piece, and it didn't work. It seems very picky and will not function without that small metal piece.

I never did effectively solve the problem and sold the phone as- is.

Good luck

Update

Also... Check if the signal is just weak or if there is none at all. Take it close to your router and see if it picks up a signal. If it does, it's very likely a problem with the metal clip and shield I mentioned.

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I insist to tell that the metal shield acting as an antenna is a myth. The real antenna is located on the speaker ring, scotched with tape.

Just to tell you that in other iPhones I taken off the shield and the Wi-Fi was still working...

So that does not solve my issue...

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That has not been my experience. On another 4 I had done some work on, the WiFi would not function without that clip. I tested with and without the clip, and it clearly serves a function in the WiFi antenna circuit. Whether the shield itself is the antenna, is hard to say. I think you may be right about thinking it isn't because after further examining it, the clip seems to bridge the connection to the screw itself and not the shield. Likely that screw is making contact with the frame of the phone somehow.

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