Try using different a GSM band exclusively, either 3G or 4G or even using a SIM card from another carrier (if possible) that uses a different signalling [link|https://www.frequencycheck.com/countries/united-states|frequency] and check if that alters anything.
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Try using a different GSM band exclusively, either 3G or 4G or even using a SIM card from another carrier (if possible) that uses a different signalling [link|https://www.frequencycheck.com/countries/united-states|frequency] and check if that alters anything.
If it works OK on some frequencies or bands but not others, follow the relevant flowchart (see manual below) for the band or frequency that doesn't work properly.
Reason I suggest this is, looking at the troubleshooting flowcharts from the [document|40216|service manual] for the phone, (start at p.39/48), there seems to be only a few common factors that would affect all bands (and frequencies), i.e. the charge port board (which you have already replaced), the flex cable that connects to it and then as best as I can find there are two ICs that seem to be used for all bands and frequencies, U1514 and UCP5000.
U1514 is shown on p.3/48 and UCP5000 is shown on p.6/48 of the manual.
Try using different a GSM band exclusively, either 3G or 4G or even using a SIM card from another carrier that uses a different signalling [link|https://www.frequencycheck.com/countries/united-states|frequency] and check if that alters anything.
+
Try using different a GSM band exclusively, either 3G or 4G or even using a SIM card from another carrier (if possible) that uses a different signalling [link|https://www.frequencycheck.com/countries/united-states|frequency] and check if that alters anything.
If it works OK on some frequencies or bands but not others, follow the relevant flowchart (see manual below) for the band or frequency that doesn't work properly.
Reason I suggest this is, looking at the troubleshooting flowcharts from the [document|40216|service manual] for the phone, (start at p.39/48), there seems to be only a few common factors that would affect all bands (and frequencies), i.e. the charge port board (which you have already replaced), the flex cable that connects to it and then as best as I can find there are two ICs that seem to be used for all bands and frequencies, U1514 and UCP5000.
U1514 is shown on p.3/48 and UCP5000 is shown on p.6/48 of the manual.
Try using different a GSM band exclusively, either 3G or 4G or even using a SIM card from another carrier that uses a different signalling [link|https://www.frequencycheck.com/countries/united-states|frequency] and check if that alters anything.
+
If it works OK on some frequencies or bands but not others, follow the relevant flowchart (see manual below) for the band or frequency that doesn't work properly.
+
Reason I suggest this is, looking at the troubleshooting flowcharts from the [document|40216|service manual] for the phone, (start at p.39/48), there seems to be only a few common factors that would affect all bands (and frequencies), i.e. the charge port board (which you have already replaced), the flex cable that connects to it and then as best as I can find there are two ICs that seem to be used for all bands and frequencies, U1514 and UCP5000.
U1514 is shown on p.3/48 and UCP5000 is shown on p.6/48 of the manual.
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If it works OK on some frequencies or bands but not others, follow the relevant flowchart for the band or frequency that doesn't work properly.
Try using different a GSM band exclusively, either 3G or 4G or even using a SIM card from another carrier that uses a different signalling [link|https://www.frequencycheck.com/countries/united-states|frequency] and check if that alters anything.
Reason I suggest this is, looking at the troubleshooting flowcharts from the [document|40216|service manual] for the phone, (start at p.39/48), there seems to be only a few common factors that would affect all bands (and frequencies), i.e. the charge port board (which you have already replaced), the flex cable that connects to it and then as best as I can find there are two ICs that seem to be used for all bands and frequencies, U1514 and UCP5000.
U1514 is shown on p.3/48 and UCP5000 is shown on p.6/48 of the manual.
+
+
If it works OK on some frequencies or bands but not others, follow the relevant flowchart for the band or frequency that doesn't work properly.
Try using different a GSM band exclusively, either 3G or 4G or even using a SIM card from another carrier that uses a different signalling [https://www.frequencycheck.com/countries/united-states|frequency]?
+
Try using different a GSM band exclusively, either 3G or 4G or even using a SIM card from another carrier that uses a different signalling [link|https://www.frequencycheck.com/countries/united-states|frequency] and check if that alters anything.
-
Reason I suggest this is, looking at the troubleshooting flowcharts from the [document|40216|service manual] for the phone, there seems to be only a few common factors that would affect all bands (and frequencies), i.e. the charge port board (which you have already replaced), the flex cable that connects to it and then as best as I can find there are two ICs that seem to be used for all, U1514 and UCP5000.
+
Reason I suggest this is, looking at the troubleshooting flowcharts from the [document|40216|service manual] for the phone, (start at p.39/48), there seems to be only a few common factors that would affect all bands (and frequencies), i.e. the charge port board (which you have already replaced), the flex cable that connects to it and then as best as I can find there are two ICs that seem to be used for all bands and frequencies, U1514 and UCP5000.
U1514 is shown on p.3/48 and UCP5000 is shown on p.6/48 of the manual.
Hi @mikejoyce41293
Try using different a GSM band exclusively, either 3G or 4G or even using a SIM card from another carrier that uses a different signalling [https://www.frequencycheck.com/countries/united-states|frequency]?
Reason I suggest this is, looking at the troubleshooting flowcharts from the [document|40216|service manual] for the phone, there seems to be only a few common factors that would affect all bands (and frequencies), i.e. the charge port board (which you have already replaced), the flex cable that connects to it and then as best as I can find there are two ICs that seem to be used for all, U1514 and UCP5000.
U1514 is shown on p.3/48 and UCP5000 is shown on p.6/48 of the manual.