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Iphone 6s+ no Cameras

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  • Iphone 6s+ no Cameras

    Had an iphone 6s+ with a broken lcd that I did a screen repair on. After the repair, the phone was disabled so I was unable to test the device. Later that evening after they did the restore, they reported the cameras were not working. I found it odd that both were not working. Got the phone back from them and sure enough they are not working. No error, just black. Looking at ZXW and schematic, I found the PP2V85_FCAM_AVDD_CONN line and its getting vcc main power to the ldo, but only about .5 amp on the 2v85. I replaced the LDO with no change. Looking for some more direction.

  • #2
    Did you follow rule #1?

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    • #3
      You don't have a board problem till you know you don't have a parts problem?

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      • #4
        Originally posted by Allan View Post
        You don't have a board problem till you know you don't have a parts problem?
        yes--so you ruled out bad camera, or bad camera connection?

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        • #5
          yes, I didn't have a back camera, so i unplugged it and tried a new front camera, same response. The phone thinks the camera is ready and shows all the features, its just a black image.

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          • #6
            It would be nice to test with known good fcam and rcam. There is a variable in how the CPU figures out if there is a camera ready, and it could disable the software, and hence its own output on the enable line to the LDO if its not getting a ping back from both cameras. But, if that's not possible, then go ahead and look at the schematic. Stare at the connectors and try to guess (anyone's guess) how the CPU might determine if a camera is present. What lines are potentially important for that. Then think about how a line can fail---short, open circuit, or upstream dude not working and not producing power/data on that line (i.e. the camera itself not working). Then answer this question---how can I use my multimeter to rule out short/open on the lines I think might be important for CPU/camera communication?

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            • #7
              So i found some good parts and tested. The front camera works if the back camera is not plugged in. The neither camera works if the back camera is plugged in. The back camera does not work by itself. Every pin on the connector reads correct diode mode, so this seems to be more related to the cpu telling the camera to turn on. However why would it affect the front camera if that was the case.

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              • #8
                One thing that can cause confusion when troubleshooting cameras is that sometimes if you have either front or rear camera open last in the app, then boot with that camera disconnected, neither will work until you select the correct camera and reboot again.

                Sounds like you have a problem with rear camera and you're only getting .5v on the 2.85v line. That seems very odd. Does diode mode on that line match a known good? Is there a way to test with your multimeter if that chip is being told to do its job?

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                • #9
                  When you go onto the back camera, does it say anything on the screen, such as warnings etc ?. The only reason I ask is last week I had a iphone 6 in where the rear camera wouldnt work. and spraying the top of the board with freeze spray would bring back the camera working for about 30 seconds before it died again. It had a little icon in the corner of the camera saying that I couldnt use the camera until the flash cooled down. The dumbell that had been dropped onto the phone had broken the line to the thermister near the camera so kept on turning the camera off as it thought the flash was getting too hot. Its probably not the case with yours, but just wondered if there was any yellow warning signs in the corner of the camera screen.

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                  • #10
                    t would be nice to test with known good fcam and rcam. There is a variable in how the CPU figures out if there is a camera ready, and it could disable the software, and hence its own output on the enable line to the LDO if its not getting a ping back from both cameras. But, if that's not possible, then go ahead and look at the schematic. Stare at the connectors and try to guess (anyone's guess) how the CPU might determine if a camera is present. What lines are potentially important for that. Then think about how a line can fail---short, open circuit, or upstream dude not working and not producing power/data on that line (i.e. the camera itself not working). Then answer this question---how can I use my multimeter to rule out short/open on the lines I think might be important for CPU/camera communication?


                    Rear Camera



                    AP_TO_RCAM_CLK_CONN From pin 20 of J3200 VIA filter FL3230 converts to AP_TO_RCAM_CLK to resistor R0808 converts to AP_TO_RCAM_CLK_R To CPU (U0600) pin D33 (SENSOR0_CLK)

                    AP_TO_RCAM_SHUTDOWN_CONN_L From J3200 pin 30 of J3200 VIA Filter FL3231 converts to AP_TO_RCAM_SHUTDOWN_L to CPU (U0600) pin D32 (SENSOR0_RST)







                    FRONT CAMERA

                    AP_TO_FCAM_CLK_CONN From pin 5 of J1200 VIA Filter FL3110 converts to AP_TO_FCAM_CLK To resistor RO809 Converts to AP_TO_FCAM_CLK_R TO CPU (U0600) pin F33 (SENSOR1_CLK)

                    AP_TO_FCAM_SHUTDOWN_CONN_L (Pin 15 of J100) through Filter FL3111 converts to AP_TO_FCAM_SHUTDOWN_L To CPU (U0600) pin E34 (SENSOR1_RST)




                    Could not upload image for AP_TO_FCAM_SHUTDOWN_L To CPU (U0600) pin E34 (SENSOR1_RST) --- 5 images allowed


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                    • #11

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