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No Signal - No Service - No Capacitor - Motherboard picture

Hi to all,

this is my first post here. I heard about this forum on another website...that hear are professionals and they could help me maybe.

So my problem...i have bought an used iPhone 4 which is factory unlocked and jailbreaked. When i put my sim card inside i can use

WIFI without problems, but i don't get phone signal...always searching and no signal - no service.

So i decided to open the phone, and look...

- i see a broken signal antenna which was not connected anymore (I will buy a new one and replace it)

- the battery bracket connector was not there - somebody removed it and lost (I will buy a new one and replace it)

- i don't see the small blue capacitor-coil...and there shold be another small capacitor (smd)...look at the picture (?????)

[B]

Picture: http://oi46.tinypic.com/n532i8.jpg [/B]

Can somebody tell me if this is normal that there is no capacitor near the antenna connection? I looked on other pictures of iphone logic boards and

saw, that they have a small blue capacitor there and also another one capacitor, which is same size but not blue.

Should i buy new smd capacitors and solder on the board or? What are the suggestions...and what type of capacitor is this...what mode, how many V and what capacity in uF?

Thank you guys for your help in advance!

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Hi, I think those are coupling capacitors, try any value from 1nf. I could be wrong but I think it is one of those. Write back what you did. Good luck.

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Hello John! Did it work? Did you resolve the signal problem (no service)?

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Hi,

Please check the image:

Block Image

Red :This is the antenna.You have to change it.

Blue : The antenna connector.Try to repear it somehow or just change it.

Yellow: Just make a bridge between this two points.

It should work :)

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Hi Mustafa,

thank you very much for your help. I ordered a new antenna.

When it will arrive, i will replace it an try to connect this two points.

You have any idea what to use for cennecting this two points?

Soldering wire or a small cable?

:)

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You have to solder thin cable like in the pic:

Block Image

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Depending on your soldering skills you could also use liquid silver. It is really easy to apply and is made for situations like this. I often do iPhone repairs and find this very usefull. But keep in mind that this stuff is more expensive then soldering, i paid €30,- for it.

Good luck

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this is a very simply repair if one knows how to. simply run a small wire from the left side of the antenna to the far left antenna bridging it across the blue coil and hey presto! signal works again!

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Hi to all :)

Many thanks to everybody for all your answers and help.

1. I ordered a new antenna and replaced it

2. I just straightened antenna connector a little bit

3. I did solder a bridge - where the blue coil should be located

And the signal is there. Great...but i see now the wifi signal get worse, then before...hmmm.

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Hola soy de Argentina y tengo el mismo problema! adquiri un Iphone 4 16gb Black, sin garantia que supuestamente estaba BLOQUEADO. cosa que asi no fue, el telefono esta liberado por imei, de todos modos no levanta señal. Aparece buscando y luego SIN SERVICIO. Lo desarme y veo que no hay continuidad en la antena entre los positivos. Alguien puede ayudarme? mi email es ALANCMG@GMAIL.COM

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Ace さん、ありがとうございました！
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