Why am I loosing cellular signal?

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iPhone 6

这款4.7英寸iPhone于2014年9月19日发布，是iPhone 6 Plus的缩小版。

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Chr @ckirkhoff

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发帖于: 2016年12月26日

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Why am I loosing cellular signal?

My iPhone 6 is really weird.

It will loose cellular network at night time and it will just say "No Network" or constantly say "Searching.."

No on/off, flight mode on/off, hard reset, network setting reset, setting reset or content and setting reset will work. Even setting up as a new iPhone will not prevent it.

Now the weird part is, that if I disconnect the battery and connect it again, then it works!!! All day only to loose cellular network next day towards night time.

Then I reconnect the battery again and I can go another day. I am on my 4th day now.

So everything works, just not as it supposed to. Really annoying to have to open the phone everyday.

Does anyone have an idea of what is going on? :-(

Thank you. :)

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Have you checked that the IMEI number of the phone has not been barred / blocked?

Also the last time I had this issue I could not solve it. It's probably one of those apple defect issues in terms of baseband chip or the cellular radio switching thing I forgot what it was called but I think it's some capacitor used to get power to it.

由 Ben 完成的 2016年12月26日

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iMedic @theimedic

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发帖于: 2016年12月26日

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Gosh, this is weird. I'm gonna go hardware. Replace the antennae cable

iPhone 6 Logic Board Antenna Flex Cable

https://m.youtube.com/watch?v=jNfGHP6Ucg...

But it is weird, that it works for a day, after power cycling. Anybody else?

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iPhone 6 Logic Board Antenna Flex Cable

$9.99

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Har bestilt et nyt Logic Board antenne flex cable, men kan ikke se hvordan sådan et cable pludselig kan stå af uden at have haft motherboardet ude før.

Men eliminere gerne muligheden.

由 Chr 完成的 2016年12月27日

Også sidste gang jeg havde dette problem, jeg kunne ikke løse det. Det er sandsynligvis en af disse æble defekt spørgsmål i form af baseband chip eller det cellulære radio skift ting jeg glemte, hvad det blev kaldt, men jeg synes det er nogle kondensator bruges til at få strøm til den. Det hovedkortet kan kræve micrsoldering. Jeg ved ikke, om der er et firma i nærheden af dig, kan det løse dette

由 iMedic 完成的 2016年12月27日

Jeg tror jeg vil forsøge at finde en brugt telefon og skifte dele indtil jeg finder synderen, hvis det er motherboardet der kræver reperation, så må jeg give den til et firma der laver dem. Dermed har jeg også en telefon mens jeg må undvære min egen. Så må jeg sælge reserve telefonen når min egen kommer tilbage.

Kan ikke finde ud af hvad jeg ellers kan gøre. :-)

由 Chr 完成的 2016年12月28日

enten har hovedkortet MICROSOLDER fast, eller købe en ny telefon

由 iMedic 完成的 2016年12月28日

Hey guys, no offense intended but it would certainly be more helpful for the community if this conversation took place in english (Hey gutter, nogen lovovertrædelse beregnet, men det ville sikkert være mere nyttigt for samfundet, hvis denne samtale fandt sted i engelsk.).

由 Minho 完成的 2016年12月28日

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Have you checked that the IMEI number of the phone has not been barred / blocked?

Also the last time I had this issue I could not solve it. It's probably one of those apple defect issues in terms of baseband chip or the cellular radio switching thing I forgot what it was called but I think it's some capacitor used to get power to it. — Ben
Har bestilt et nyt Logic Board antenne flex cable, men kan ikke se hvordan sådan et cable pludselig kan stå af uden at have haft motherboardet ude før.

Men eliminere gerne muligheden. — Chr
Også sidste gang jeg havde dette problem, jeg kunne ikke løse det. Det er sandsynligvis en af disse æble defekt spørgsmål i form af baseband chip eller det cellulære radio skift ting jeg glemte, hvad det blev kaldt, men jeg synes det er nogle kondensator bruges til at få strøm til den. Det hovedkortet kan kræve micrsoldering. Jeg ved ikke, om der er et firma i nærheden af dig, kan det løse dette — iMedic
Jeg tror jeg vil forsøge at finde en brugt telefon og skifte dele indtil jeg finder synderen, hvis det er motherboardet der kræver reperation, så må jeg give den til et firma der laver dem. Dermed har jeg også en telefon mens jeg må undvære min egen. Så må jeg sælge reserve telefonen når min egen kommer tilbage.

Kan ikke finde ud af hvad jeg ellers kan gøre. :-) — Chr
enten har hovedkortet MICROSOLDER fast, eller købe en ny telefon — iMedic
Hey guys, no offense intended but it would certainly be more helpful for the community if this conversation took place in english (Hey gutter, nogen lovovertrædelse beregnet, men det ville sikkert være mere nyttigt for samfundet, hvis denne samtale fandt sted i engelsk.). — Minho

Stephen Elliott @mdrecovery 声誉积分: 1.8千 4 8 2 · Answer 1 · 2017-01-07T23:24:53-07:00

Stephen Elliott @mdrecovery

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The antenna cable showed above is only for wifi. Your actual signal cable is attached to your dock connector/charging port assembly. You could try replacing that.

Also I would check for bends in your frame (metal back housing). This frame actually acts as an antenna and if its bent or damaged it could be causing problems receiving service.

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Hi Stephen.

I swapped the motherboard over with another working iPhone 6 and the working motherboard made the rest of my phone work fine. However the working phone that now have my motherboard in it got the No service problem. So I believe the fault is in the motherboard and not the casing or any of the connections.

由 Chr 完成的 2017年1月8日

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tonyhamre @tonyhamre50710 声誉积分: 973 Apple hardware repairs 5 4 · Answer 2 · 2017-01-08T07:43:27-07:00

tonyhamre @tonyhamre50710

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Apple hardware repairs

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High likelihood you have a power amplifier failure there are low band mid band and high and signal amplifiers 2g,3g,4g

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Hi Tonyhamre.

Would that mean they are all faulty and where are they located on the iPhone 6?

由 Chr 完成的 2017年1月8日

i have just gone over your post again and will try to explain my thoughts.

the iPhone has what is called a TriStar (U2) many call this a charging IC but in fact it is a high speed switch. the TriStar switches three things on the iPhone.

the Mains voltage/Battery voltage the CPU and the Baseband Modem.

your description of unplugging the battery suggests a switching fault on the Modem switch of the Tristar as when you disconnect and reconnect the battery you are resetting the switch. i would look at getting the Tristar replaced as a elimination

由 tonyhamre 完成的 2017年1月10日

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Chr @ckirkhoff 声誉积分: 1 1 · Answer 3 · 2017-01-17T00:11:54-07:00

Chr @ckirkhoff

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发帖于: 2017年1月17日

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Hi Tonyhamre.

Thank you so much for your advice and thoughts. Sounds like a very qualified guess. Unfortunately I won't find out as I ended up selling it as a defect phone.

I can replace everything except for things on the motherboard, so this repair was outside my skill set, so I felt I better leave it to someone who can do it themselves without having to pay $300 for it.

I hate giving up on things, but I felt this was too risky for me.

Thank you for all your help thou. ;-)

Christian

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iPhone 6

Why am I loosing cellular signal?

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iPhone 6 Logic Board Antenna Flex Cable

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