iPhone 7 only recognize serial number - GSM-Forum

7Axis · 09-24-2018, 22:30

I have an iPhone 7 that has been restored and cannot get past the setup screen because of the missing IMEI, when I look up the phone information the only information there is includes the serial number, is there a way to check if it is the baseband? I checked the IMEI (printed on sim tray) and the full check shows the IMEI, there are no bad finances report on it, and the iCloud is off, I think this has to do with the phone reaching the server? SIM card isnt detected and remains on No Service, theres also a black exclamation mark icon next to that No Service indication.

7Axis · 09-24-2018, 22:33

I should specify the WiFi does actually work properly and connects to a wide range of SSID, this is definitely a greater issue since the IMEI simply isnt showing, either on phone or on iTunes.. how should I troubleshoot it?

7Axis · 09-25-2018, 01:06

I noticed a constant amperage jump from 0.1A to 0.4A when idle, and further investigation shows that PP_VSW_S1 has no voltage, just to be sure, BASEBAND PMU produces that voltage correct? Anyone had a similar issue before?

naushad09 · 09-25-2018, 08:12

Quote:

Originally Posted by 7Axis

I have an iPhone 7 that has been restored and cannot get past the setup screen because of the missing IMEI, when I look up the phone information the only information there is includes the serial number, is there a way to check if it is the baseband? I checked the IMEI (printed on sim tray) and the full check shows the IMEI, there are no bad finances report on it, and the iCloud is off, I think this has to do with the phone reaching the server? SIM card isnt detected and remains on No Service, theres also a black exclamation mark icon next to that No Service indication.

Its Is0 12 issue Downgraded 11.4.1

KE6SOLTI · 09-25-2018, 09:01

post problam picture bro. it will be easy to understand that its a ios b u g or hardware problam.

7Axis · 09-25-2018, 14:48

Thanks for the reply, however I think the issue is definitely hardware considering that PP_VSW_S1 has no voltage, PP_VSW_S2,S3,S4 and S5 all have proper voltages although, therefore BBPMU_TO_PMU_AMUX1 has no voltage either, if I remove the coil L5601_RF there still is no voltage being produced by PP_VSW_S1, therefore it tell me that the Baseband CPU isn't bringing the line down since PP_VSW_S1 (I think) originates from Baseband PMU, also PP_1V0_LDO9 has no voltage (very close to the PP_VSW_S1 pads) is that enough to conclude the Baseband PMU is defective?

I have a 250 ohms resistance on the PP_VSW_S1 line, can anyone take a working board and tell me the resistance they have??

7Axis · 09-25-2018, 22:30

I have reballed the Baseband PMIC and now it has worsened, the phone still boots the same, but now every PP_VSW lines are down, so are the LDO lines(Feeded by VSW) I'm guessing I will have to buy a new Baseband PMU IC, has anyone came across this issue that could just give me some assurance that this problem is indeed BB PMU related and not BB CPU? please?

Burebista · 01-11-2019, 01:40

I've just solved one with this issue today.
The problem was from the main PMU: https://www.instagram.com/p/Bsd8uXOA..._web_copy_link

09-24-2018, 22:30	#1 (permalink)
7Axis Freak Poster Join Date: Nov 2017 Location: Canada Posts: 131 Member: 2777379 Status: Offline Thanks Meter: 34	iPhone 7 only recognize serial number I have an iPhone 7 that has been restored and cannot get past the setup screen because of the missing IMEI, when I look up the phone information the only information there is includes the serial number, is there a way to check if it is the baseband? I checked the IMEI (printed on sim tray) and the full check shows the IMEI, there are no bad finances report on it, and the iCloud is off, I think this has to do with the phone reaching the server? SIM card isnt detected and remains on No Service, theres also a black exclamation mark icon next to that No Service indication.

09-25-2018, 14:48	#6 (permalink)
7Axis Freak Poster Join Date: Nov 2017 Location: Canada Posts: 131 Member: 2777379 Status: Offline Thanks Meter: 34	Thanks for the reply, however I think the issue is definitely hardware considering that PP_VSW_S1 has no voltage, PP_VSW_S2,S3,S4 and S5 all have proper voltages although, therefore BBPMU_TO_PMU_AMUX1 has no voltage either, if I remove the coil L5601_RF there still is no voltage being produced by PP_VSW_S1, therefore it tell me that the Baseband CPU isn't bringing the line down since PP_VSW_S1 (I think) originates from Baseband PMU, also PP_1V0_LDO9 has no voltage (very close to the PP_VSW_S1 pads) is that enough to conclude the Baseband PMU is defective? I have a 250 ohms resistance on the PP_VSW_S1 line, can anyone take a working board and tell me the resistance they have?? Last edited by 7Axis; 09-25-2018 at 14:55.

09-24-2018, 22:33	#2 (permalink)
7Axis Freak Poster Join Date: Nov 2017 Location: Canada Posts: 131 Member: 2777379 Status: Offline Thanks Meter: 34	I should specify the WiFi does actually work properly and connects to a wide range of SSID, this is definitely a greater issue since the IMEI simply isnt showing, either on phone or on iTunes.. how should I troubleshoot it?

09-25-2018, 01:06	#3 (permalink)
7Axis Freak Poster Join Date: Nov 2017 Location: Canada Posts: 131 Member: 2777379 Status: Offline Thanks Meter: 34	I noticed a constant amperage jump from 0.1A to 0.4A when idle, and further investigation shows that PP_VSW_S1 has no voltage, just to be sure, BASEBAND PMU produces that voltage correct? Anyone had a similar issue before?

09-25-2018, 09:01	#5 (permalink)
KE6SOLTI No Life Poster Join Date: Mar 2013 Location: Nepal Age: 41 Posts: 728 Member: 1906979 Status: Offline Sonork: 100.1681049 Thanks Meter: 162	post problam picture bro. it will be easy to understand that its a ios b u g or hardware problam.

09-25-2018, 22:30	#7 (permalink)
7Axis Freak Poster Join Date: Nov 2017 Location: Canada Posts: 131 Member: 2777379 Status: Offline Thanks Meter: 34	I have reballed the Baseband PMIC and now it has worsened, the phone still boots the same, but now every PP_VSW lines are down, so are the LDO lines(Feeded by VSW) I'm guessing I will have to buy a new Baseband PMU IC, has anyone came across this issue that could just give me some assurance that this problem is indeed BB PMU related and not BB CPU? please?

01-11-2019, 01:40	#8 (permalink)
Burebista No Life Poster Join Date: Feb 2006 Location: In a point from Universe! Age: 40 Posts: 1,633 Member: 235325 Status: Offline Sonork: 100.1593552 Thanks Meter: 523	I've just solved one with this issue today. The problem was from the main PMU: https://www.instagram.com/p/Bsd8uXOA..._web_copy_link