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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Sony Ericsson > Sony Ericsson Hardware Repair

Sony Ericsson Hardware Repair Post here your Hardware Repairing Hints or Problems with SonyEricsson and Sony Phones.

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Old 03-20-2017, 16:20   #1 (permalink)
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Question Sony Xperia Z3+ GSM Antenna question (E6553)


I have a Sony Xperia Z3+ which has trouble maintaining a stable GSM connection.

The model number is E6553, and the GSM antenna is unlike the 'normal' Z3 model which I have plenty of access to. Unfortunately I don't have an extra Z3+, so I would like to ask a question to clarify if there's a problem with the frame as I suspect.

The device performed perfectly from new, and as time went on it became harder and harder for it to connect and maintain a GSM datastream.
It would lose signal, and disconnect during calls - and get worse over time.

I opened it up, and it looks fine - though the springs at the bottom had set a bit. I measured the resistence between the antenna center connection and ground and found it to be 0 ohm.
I then lift the antenna pcb - and it rises to infinity on my meter.
The springs were bent out a little, to ensure a good connection to the frame as the glass above it was moving in and out.

Can anyone confirm that the GSM antenna resistence should be 0 ohms on a Z3+
- the 0 ohm are also present on the main board when the cable is connected, etc.

The device is capable of receiving GSM, it's not perfect, and I do realize there's a large loop for the RF signals to do their thing. It's just the first time I have ever seen a truly shorted (0-ohm) circuit.

Some pictures, 0 posts = no linking allowed, can be provided upon request - sorry..

Thanks in advance - I hope you can help to clarify if I need a new frame or the Z3+ is supposed to be this way
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Old 03-21-2017, 11:50   #2 (permalink)
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Picture tryout 1 - post training ;)

Here's a try to do pictures - they are pretty descriptive:
- count post 2
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Old 03-21-2017, 13:06   #3 (permalink)
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Okay, the site where I posted the pictures starts with
https://
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Old 03-21-2017, 14:27   #4 (permalink)
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The next part is a two part one:

Picture 1: s23-postimg
Picture 2: s29-postimg

It ends in org, replace the dash with a dot
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Old 03-21-2017, 15:36   #5 (permalink)
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Here's the next part of the address,

Picture 1: 95r1rw0ln
Picture 2: 40ojz6vav
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Old 03-21-2017, 16:06   #6 (permalink)
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Then, at last, the file names:

File 1: Z3_1
File 2: Z3_2

And it's a jpg
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Old 03-23-2017, 11:40   #7 (permalink)
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This is the 7'th post - sorry for bumping it to the top all the time.
Thanks for a great forum!
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Old 03-23-2017, 13:38   #8 (permalink)
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8 - nearly there, but it seems it takes forever. Omega-rotate_8_90_deg
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Old 03-23-2017, 16:13   #9 (permalink)
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I hope I can edit a post I already did
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Old 03-24-2017, 11:48   #10 (permalink)
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10'th post.
Pictures are coming soon. Thanks for your patience, and thanks in advance for your advice/test
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Old 03-24-2017, 14:29   #11 (permalink)
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No edit possible, after a while

Here's a few pictures, I hope anyone has experience or can help determine if the frame is defective:




Thanks in advance
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Old 03-24-2017, 16:29   #12 (permalink)
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The 0 rezistance is not abnormal in that area...because if you connect antena is like a closed circuit....and also in PA and Antena switch are some coils and filters on the output...maybe this is the reason that you find always 0 Ohms....just look for contacts between antenna and connector...or maybe just take out the connector for external antenna and jump it...but look better to not put on ground the "hot pin " ...

regards
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Old 03-27-2017, 10:58   #13 (permalink)
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Quote:
Originally Posted by jan_gabriel2000 View Post
The 0 rezistance is not abnormal in that area..
regards
Thanks for your reply jan_gabriel2000
I have worked on RF systems before, and I know they can trick you easily.

What I find strange on this Z3+ is that the RF output is essentially looking into a short (this short being at DC). Perhaps the impedence at the right GSM frequencies are 50 ohm, and the short filters out unwanted harmonics. (I'm missing some test equipment here to verify this on my own)

Can anyone confirm my thoughts?
Thanks!
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Old 04-20-2017, 10:53   #14 (permalink)
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gfxhgv cjkbjl vcgkhjblj
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