Hello,
A few weeks ago, I replaced my screen because my smartphone had fallen. When disconnecting the antenna cable, the coax connection on the PCB was broken. So I ordered a new PCB. However, with the new PCB, I no longer have any coverage. Is it possible that the PCB is not suitable for the European / Belgian network (GSM/Edge/3g/lte). I also noticed that the PCB I received differs a lot from the design that was in my smartphone. The PCB under the smartphone is the defective PCB, the mounted PCB is the PCB is the new PCB. You can find a picture here: https://imgur.com/Wzmq0p0 When my broken screen was still on the smartphone, I had full range and there was nothing wrong with the network. The connections of the cable is also not damaged: https://imgur.com/H4WkFmA Screenshot of no coverage, but SIM card data that is read: https://imgur.com/tkOhXI9 I tested 2 sim cards that I in the Pocophone. Both are from another provider. Neither got a signal. In my other smartphone, both SIM cards were connected to the network and worked as expected. Does somebody know if I ordered the wrong PCB foe Belgium?
Are you certain that the antenna cable is good?
If it's damaged the sim should show up but with no network at all. (Exactly the behavior that you're having)
---------- Post added at 11:30 PM ---------- Previous post was at 11:26 PM ----------
The chips' small differences are normal between an aftermarket and an original imo
ablivian said:
Hello,
A few weeks ago, I replaced my screen because my smartphone had fallen. When disconnecting the antenna cable, the coax connection on the PCB was broken. So I ordered a new PCB. However, with the new PCB, I no longer have any coverage. Is it possible that the PCB is not suitable for the European / Belgian network (GSM/Edge/3g/lte). I also noticed that the PCB I received differs a lot from the design that was in my smartphone. The PCB under the smartphone is the defective PCB, the mounted PCB is the PCB is the new PCB. You can find a picture here: https://imgur.com/Wzmq0p0 When my broken screen was still on the smartphone, I had full range and there was nothing wrong with the network. The connections of the cable is also not damaged: https://imgur.com/H4WkFmA Screenshot of no coverage, but SIM card data that is read: https://imgur.com/tkOhXI9 I tested 2 sim cards that I in the Pocophone. Both are from another provider. Neither got a signal. In my other smartphone, both SIM cards were connected to the network and worked as expected. Does somebody know if I ordered the wrong PCB foe Belgium?
Click to expand...
Click to collapse
some blue resistor is missing in new one, i think!
The antenna was damaged a bit, but i also ordereda new one with the damaged one worked.
Because the antenna cable of the pocophone was out of stock, i ordered another one from xiaomi. It was a little bit longer but, still the same issue
ablivian said:
The antenna was damaged a bit, but i also ordereda new one with the damaged one worked.
Because the antenna cable of the pocophone was out of stock, i ordered another one from xiaomi. It was a little bit longer but, still the same issue
Click to expand...
Click to collapse
In the pic it seems like the antenna cable is a bit smashed by the bezel when it was screwed together. You could try with another cable and test for signal before reassembling the phone.
I made 2 movies to show that there should be a difference and that the issue is not the antenna cable.
In this movie, I installed the new PCB and there is no networkconnectivity:
HTML:
https://youtu.be/0xNUxfh3CXM
In this movie, I installed the PCB without COAX-connection for the antenna, but just tape. I'm using is now with tape for about 5 days:
HTML:
https://youtu.be/NIRFgzkucUk
Does anyone have an idea, where to fine the correct PCB to use in Belgium (Europe)?
I contacted the company, but they only say they buy it from "Iparts Buy".
Any help would be appreciated.
Did you ever get this issue resolved. I'm having the same problem
Hey
Here is a link to a trusted shop in Germany (mobiltec24). I can't post a link. I'm a new member.
I have the same problem as you. I am also looking for a solution. I buy a pocophone without mobilenetwork. I can't unlock the bootloader without SIM Card.
Having the same issue, any update ?
Related
Does anyone know what the connector for external antennas on the back of the wizard is called? I want to build a custom antenna that I can embed into my clothing to improve reception at school. I can't use a regular antenna since phones aren't allowed to be used at school.
HDR said:
Does anyone know what the connector for external antennas on the back of the wizard is called? I want to build a custom antenna that I can embed into my clothing to improve reception at school. I can't use a regular antenna since phones aren't allowed to be used at school.
Click to expand...
Click to collapse
The antenna part is:
P/N:36H00341-00M "Antenna Pre-Assy, AMPHENOL, GAN40023, PRODIGY"
I am attaching 2 pictures, the first you can see the Antenna Assembly (silver chunky thing above the case) and a second picture of the main board. You can see the brass connector just above the bar code.
This connector type is an AMPHENOL (brand) FME...at least it should be. One of these days I'll get and antenna.
--M
PS when you get the antenna, get a connector that at least has a 90degree bend in it. You might want to try http://www.wilsonelectronics.com
I have one
I grabbed one of those adapters, unfortunately, I cannot remember where. One end (FME) fits into the back of the phone with the 90 degree plug, the other end on mine is a TNC connector. I got that as I had a couple of spare antennas that use TNC.
It does improve the reception. I use the antenna's in the vehicle when on the highway to maintain reception. (I have no problems in the city)
Depending on your device, you may want to update the Radio ROM, if you haven't already. This doesn't flash/reset your phone, but does update the radio. This might resolve your problem without spending any money.
I am using the 2.47.11 Radio ROM and it did make a difference. My device is the T-Mobile MDA (Wizard). In a particular location, where I would get zero reception, I now get one bar...and that's all the difference I need.
P.S. If you do get this adapter, be careful when plugging it in and during use. Remember that FME connector is attached to the circuit board.
Hi,
I recently replaced my usb flex cable, and my signal has been very weak ever since. I have tried loosening the screws and removing the small wire (aerial) and putting it back on, but my signal is still very very poor. Has anyone else had this problem after disassembly?
It may not be relevant but i'll mention it anyway. The screwdriver I used had a slight magnetic charge, just enough to pick up the screws. Could this have damaged something?
I'm on O2 UK and have tried other O2 aims, but to no avail. I have also tried my sim in other phones and signal improves greatly. I noticed it instantly after reassembling the phone so whatever has changed, happened during the course of replacing the usb flex cable.
Any help would be greatly appreciated, thanks
Does anyone have any ideas on what could be causing the signal to be so consistently weak? Would it be worth replacing the wire antenna?
I have taken this apart and put it back together countless times, trying to see if there was a loose connection etc, but have had no luck so far. I even put a bit of folded tinfoil between the usb flex cable and the contact under the battery to try and help the connection. I've completely run out of ideas.
Rotoq said:
Does anyone have any ideas on what could be causing the signal to be so consistently weak? Would it be worth replacing the wire antenna?
Click to expand...
Click to collapse
I think you just disrupt the antenna. Sending it to a customer service repairs should be a good choice
Sent from my LT18i using xda premium
As I bought it from Ebay IE, I have no warranty, so will have to pay to have it repaired. i was hoping to have a go myself, however there doesn't seem to be an awful lot of information out there regarding this problem. I have found a replacement antenna for £3 so I might try that, however I'm not sure that is the problem as the antenna looks in good condition and was only disconnected briefly.
Edit: Oh and thanks for the reply
send it to service center...
rocky23 said:
send it to service center...
Click to expand...
Click to collapse
I'll probably have to take it to my local electronic repair shop as it is not under warranty. i was really hoping to avoid this as I'm not sure what they will charge :-/
Rotoq said:
I'll probably have to take it to my local electronic repair shop as it is not under warranty. i was really hoping to avoid this as I'm not sure what they will charge :-/
Click to expand...
Click to collapse
well thts ok too jus watch out as wat hes doing?good luck m8 an do pm or post as how ur phone bhaves an costed?for repair
I'm hopefully going to leave it to be repaired this weekend but if anyone has any ideas please feel free to post them here.
well there are apps jus c in market"signal boost"u get a whole lot of apps jus giv it a try....
rocky23 said:
well there are apps jus c in market"signal boost"u get a whole lot of apps jus giv it a try....
Click to expand...
Click to collapse
Thanks, but it wasn't an app that caused the change, so I am reluctant to use an app to try and work around a proper fix.
Having read awful reviews for my local repair shop, I have just purchased a replacement antenna to try and repair it myself. It cost £3.00 so I'll fit it as soon as it arrives. If that doesn't work I will HAVE to take it to be repaired :-(
Rotoq said:
Thanks, but it wasn't an app that caused the change, so I am reluctant to use an app to try and work around a proper fix.
Having read awful reviews for my local repair shop, I have just purchased a replacement antenna to try and repair it myself. It cost £3.00 so I'll fit it as soon as it arrives. If that doesn't work I will HAVE to take it to be repaired :-(
Click to expand...
Click to collapse
Same problem here... I've just replaced my usb flex and after that i wasn't able to connect to my provider h3g 3 ita in wcdma mode...but just have roaming with other gsm provider...
I've also a sound problem from loudspeaker otr better i don'have anymore sound from my s2.
I'm reading that antenna is in the same part of luodspeaker so i hope to have break my anttenna part...
I've just oredered a new loudspeaker part and mybe i've to ordere also wire antenna...
After that i really don't know what can i think.....
Regards
cescof said:
Same problem here... I've just replaced my usb flex and after that i wasn't able to connect to my provider h3g 3 ita in wcdma mode...but just have roaming with other gsm provider...
I've also a sound problem from loudspeaker otr better i don'have anymore sound from my s2.
I'm reading that antenna is in the same part of luodspeaker so i hope to have break my anttenna part...
I've just oredered a new loudspeaker part and mybe i've to ordere also wire antenna...
After that i really don't know what can i think.....
Regards
Click to expand...
Click to collapse
I had same problem as you.
After changing USB flex PCB my network signal just vanished.
Fortunately I found solution for my problem.
Problem was in slightly different PCBs and after unsoldering one SMD element my phone is back with strong signal.
Anyway here are the pictures:
imageshack.us/photo/my-images/33/pcbn.jpg
Original PCB is upper one
imageshack.us/photo/my-images/204/pcb2m.jpg
There is difference
imageshack.us/photo/my-images/831/pcb3h.jpg
Thank you!
This worked like a charm!!! Thank you so much for your post! Save me so much money.....
LittleCannon said:
I had same problem as you.
After changing USB flex PCB my network signal just vanished.
Fortunately I found solution for my problem.
Problem was in slightly different PCBs and after unsoldering one SMD element my phone is back with strong signal.
Anyway here are the pictures:
imageshack.us/photo/my-images/33/pcbn.jpg
Original PCB is upper one
imageshack.us/photo/my-images/204/pcb2m.jpg
There is difference
imageshack.us/photo/my-images/831/pcb3h.jpg
Click to expand...
Click to collapse
I have the same problem...
How did you remove the SMD?
Magnetic screwdriver
Just FYI, magnetic screwdrivers do not cause any damage to electronic circuits and are generally safe to use.
tixxix said:
I have the same problem...
How did you remove the SMD?
Click to expand...
Click to collapse
Soldering iron with really pointy tip
Top man.......
Usb port broke so replaced it and had a very weak signal. after hours of checking everything, flashing roms, taking phone apart, 3 different usb boards and a massive headache. I followed your guide and now have strong signal again. Was nearlly at a point where phone was going to be scrapped. Thankyou
LittleCannon said:
I had same problem as you.
After changing USB flex PCB my network signal just vanished.
Fortunately I found solution for my problem.
Problem was in slightly different PCBs and after unsoldering one SMD element my phone is back with strong signal.
Anyway here are the pictures:
imageshack.us/photo/my-images/33/pcbn.jpg
Original PCB is upper one
imageshack.us/photo/my-images/204/pcb2m.jpg
There is difference
imageshack.us/photo/my-images/831/pcb3h.jpg
Click to expand...
Click to collapse
LittleCannon said:
I had same problem as you.
After changing USB flex PCB my network signal just vanished.
Fortunately I found solution for my problem.
Problem was in slightly different PCBs and after unsoldering one SMD element my phone is back with strong signal.
Anyway here are the pictures:
imageshack.us/photo/my-images/33/pcbn.jpg
Original PCB is upper one
imageshack.us/photo/my-images/204/pcb2m.jpg
There is difference
imageshack.us/photo/my-images/831/pcb3h.jpg
Click to expand...
Click to collapse
You are a life saver! I was about to trash my S2. I got it used with usb and sound problems for about 130 euro. Swapped parts but had crappy signal. The signal was bad before to which I also bought new antenna. Network signal never worked properly since acquiring the phone 2 weeks ago. Swapping modems never helped.
I still have the old USB board and it looks like exactly like the one I replaced. Thinking of the same thing you just did. Now my question to you, why didn't you remove the other SMD to make the boards match? I might try removing both on the old to compare signal levels.
Your info should be stickied!
Thanks again!
Tried that Trick but now I dont have any more signal at all...nowhere!
Hi,
I had a problem with the micro-usb port/charger in my galaxy s2. It was what others have already described (constantly charging/not charging, voltage too high messages, etc). So I decided to buy a spare part for the charger, and replace it .
The first time I turned it on, The charger problem was completely solved, but I noticed the signal was gone. I realized I forgot to connect the antenna. So I opened it again and connected it. The antenna is a HF cable which connects to one end to the main board, and to the other end to the spare part I bought.
After reconnecting the cable I saw an improvement, but the signal is still much worse that before replacing it for the first time.
I bought the part here (German language):
[] IShallNotPostLinksAsANewUset []
Could it be this replacement part?? Might be a capacity adjustment problem? I don't know how are usuallry phone antennas designed. I don't know either if this part plays an important role for the antenna (it is anyway connected to the cable).
What can it be? What would you do to recover antenna sensitivity? (I do not have the broken part, it is already gone )
Best regards
duguet said:
Hi,
I had a problem with the micro-usb port/charger in my galaxy s2. It was what others have already described (constantly charging/not charging, voltage too high messages, etc). So I decided to buy a spare part for the charger, and replace it .
The first time I turned it on, The charger problem was completely solved, but I noticed the signal was gone. I realized I forgot to connect the antenna. So I opened it again and connected it. The antenna is a HF cable which connects to one end to the main board, and to the other end to the spare part I bought.
After reconnecting the cable I saw an improvement, but the signal is still much worse that before replacing it for the first time.
I bought the part here (German language):
[] IShallNotPostLinksAsANewUset []
Could it be this replacement part?? Might be a capacity adjustment problem? I don't know how are usuallry phone antennas designed. I don't know either if this part plays an important role for the antenna (it is anyway connected to the cable).
What can it be? What would you do to recover antenna sensitivity? (I do not have the broken part, it is already gone )
Best regards
Click to expand...
Click to collapse
Hi, after having had the same problems with charging, I also changed the micro-USB flex circuit/cable. I bought it in the UK from e-cell (on ebay) ... and same as you, I am not able to get 3G anymore, only G! Charging is solved, 3G is gone!
I do have the old part still ... will put it back on and see what happens.
UPDATE:
OK, I put the original part back in ... and 3G/H was immediately back. I can also see that the network strength is the same as with the replacement part (so it doesn't seem to be a defective antenna cable or so), but now it picks up UMTS and HSPA+, while the replacement part only caught GPRS. So what this means is that the replacement part is not the same as the original ... probably the same problem you have.
At the same time there was no miracle and the original part is still no charging unfortunately ...
I had ordered 2 other replacement parts in HongKong which should arrive in a couple of weeks ... will try those when they arrive, and hopefully at least one of them will solve the charging AND the 3G issue!
UPDATE 2:
While driving around with the phone with the replacement part, sometimes I do get E/3G/H+ signals, so it appears that the part is able to handle these ... but maybe only when the signal is very strong? Or maybe there are different types of E/3G/H+ signals?
Hi,
Experiencing the exact same behaviour, the signal is really bad (never above 3 bars). I'm going to open the phone tomorrow to make sure I left the antenna cable properly connected, but judging from what I'm seeing here, I believe the issue is with the small circuit with the USB port. I bought my part from e-cell as well....
Thank you very much for your answers guys. Now I know that my problem is not unusual. however in my case the 2g signal receptiony is also to degradated. Please keep us posted when you get the spare parts from Hong Kong. If they work I will also order 1 myself.
Sent from my GT-I9100 using Tapatalk 2
duguet said:
Thank you very much for your answers guys. Now I know that my problem is not unusual. however in my case the 2g signal receptiony is also to degradated. Please keep us posted when you get the spare parts from Hong Kong. If they work I will also order 1 myself.
Sent from my GT-I9100 using Tapatalk 2
Click to expand...
Click to collapse
OK, good news ... today I got my second part, and this one seems to work just fine! 3G and H+ are back! And of course it charges.
As I ordered 2 different parts at the same time from HongKong, I am not 100% sure which one I got, but I am quite confident it is the one from mingxing200808. The item I bought is sold out now, but he relisted it (at higher price: 6.90 USD vs 3.90 USD that I paid, still worth it though). Note that the picture posted is not the same as the part shipped (which was newer, at least in my case). Also note that you need to reuse the rubber cover of the microphone (e-cell included that rubber piece). There is also no adhesive on the mingxing part, but as far as I can see you don't need that either.
Good luck!
Geronymous said:
OK, good news ... today I got my second part, and this one seems to work just fine! 3G and H+ are back! And of course it charges.
As I ordered 2 different parts at the same time from HongKong, I am not 100% sure which one I got, but I am quite confident it is the one from mingxing200808. The item I bought is sold out now, but he relisted it (at higher price: 6.90 USD vs 3.90 USD that I paid, still worth it though). Note that the picture posted is not the same as the part shipped (which was newer, at least in my case). Also note that you need to reuse the rubber cover of the microphone (e-cell included that rubber piece). There is also no adhesive on the mingxing part, but as far as I can see you don't need that either.
Good luck!
Click to expand...
Click to collapse
Hi Guys, I have had this problem also after replacing the usb board, it has been a nightmare thinking that other parts may have been water damaged I replaced the loudspeaker and inner chassis which both have antenna components. After reading your post I ordered a used part from gaproducts on ebay at £3.85 and my phone is now perfect. By the way the defective one was from china via ebay and supposed to be genuine. Wish I had seen this post a month ago it would have saved me so much hassle, but hopefully will help others.
This is strange, i have the same problem after changing the Flex Cable + Charging port. I bought it from ebay (user name yake-gandi3388) so be careful. I requested a refund or replacement but not sure what the answer will be. The phone never connects now to HSDPA (H), it always stays on EDGE (E). On top of that the signal is somehow weaker than before, not significantly, but I can notice it
I thought that the Flex Cable+Charging Port are not linked to Antenna performance in any way Can someone more experienced explain a bit?
Also, anyone tested an aftermarket flex cable+charging port that is working ok, including the antenna performance and full 3G connection?
Thanks!!!
Ive followed about 10 threads about changing usb boards.About 1 person was happy,and the other 9 got other problems.
When they put their "faulty" one back in,the "new" problems vanished.
Most were replacing the board because of usb problem.
I thought they were buying faulty replacements.For all I know someone at Samsung could be "recycling" faulty parts..
Sent from my GT-I9100 using xda premium
I'm experiencing the exact same problems!! What's weird is that with other carriers (that work in different frequencies) my phone works just fine... I'll try buying another flex cable and will tell you the results.
da_17 said:
I'm experiencing the exact same problems!! What's weird is that with other carriers (that work in different frequencies) my phone works just fine... I'll try buying another flex cable and will tell you the results.
Click to expand...
Click to collapse
Strange... I will try to check with other providers as well. On my side, I have re-contacted the Ebay member and he offered me an additional Flex Cable with no extra charge. Nice commercial initiative, however I am afraid that the next one will have the same issues Will keep you updated once it arrives.
Got this as well. I changed my USB board after it developed charging problems. The first one gave me a flashing battery icon & one of the screw holes didn't line up also. The next one fitted fine but I'm sure my signal is weaker. Compared to my friends S1 on the same network. He gets a stronger signal than me, stood in the same place. Replaced my loud speaker/antenna as I've also replaced the back chassis and think prising the speaker out might of damaged it. Think I'll try another USB board to see if it improves :S the 2nd board had the same Rev. number on it but looked slightly different to the original. (Sadly dont have the original to put back in to test)
Sent from my GT-I9100
I am signed up for a solution to this problem.
I had charging issues with the old port and replaced the board. The new board only allowed for an intermittent 1 signal bar. I put the original faulty board back in and had full signal immediately.
I ordered a second board and have the same issue. No/1 signal bar. Cannot make calls, it tells me "mobile network not available." I can connect to wi-fi with no issues though.
Unless a fix is found I am considering taking one of the new boards and my old board into a service shop and having the usb ports swapped.
Galaxy S2 SGH-i777 (AT&T)
I received a 3rd charging port board today, this one works some, but not as good as original. I'll post the number's printed on the board with there results in the phone.
Original Board: GT-i9100 REV2.2
R.B83 35
Original board worked great until it started having issues with charging/high voltage.
Replacement Board 1: GT-i9100 REV2.3
R.C42 10
This board would charge the phone and connect it to the computer, but would not connect to a network and would give no signal or a temporary 1 bar signal.
Replacement Board 2: R.B54
GT-i9100 REV2.2
This board would charge the phone and connect it to the computer, but would not connect to a network and would give no signal or a temporary 1 bar signal.
Replacement Board 3: GT-i9100 REV2.2
R.B83 36
This board both charges and connects the phone to the computer and it allows for a network signal. The network signal is not quite as good as my stock, but I think it will do.
I do not know what the board numbers mean, but I would guess the REV2.3 is an updated version of the REV 2.2. I think the compatability issue may come in the R._ numbers as Replacement Board 3 is the only one that works and is the closest R._ match. Maybe someone with far more expertise can shed some light on it, but this is my experience.
Geronymous said:
OK, good news ... today I got my second part, and this one seems to work just fine! 3G and H+ are back! And of course it charges.
As I ordered 2 different parts at the same time from HongKong, I am not 100% sure which one I got, but I am quite confident it is the one from mingxing200808. The item I bought is sold out now, but he relisted it (at higher price: 6.90 USD vs 3.90 USD that I paid, still worth it though). Note that the picture posted is not the same as the part shipped (which was newer, at least in my case). Also note that you need to reuse the rubber cover of the microphone (e-cell included that rubber piece). There is also no adhesive on the mingxing part, but as far as I can see you don't need that either.
Good luck!
Click to expand...
Click to collapse
viva! the party from Hong Kong worked for me. For everyone which needs this part search for
the vendor on google. I am using my phone for the 2100Mhz 3 g band.
Cheers!
Sent from my GT-I9100 using Tapatalk 2
Good.
So whats the vendors name....or is it classified.
Sent from my GT-N7000 using xda premium
I changed my usb port as well due to not charging/over voltage, ordered it from hongkong via ebay.
Been using the new one for over 6 months now and i would be lying if i said i had any 3G problems. And someone already asked this in this thread but no one has answered it. How are usb charging port and 3G signal linked??
Sent from my CyanogenMod 10 powered GT-I9100 using xda premium
krayndr said:
I changed my usb port as well due to not charging/over voltage, ordered it from hongkong via ebay.
Been using the new one for over 6 months now and i would be lying if i said i had any 3G problems. And someone already asked this in this thread but no one has answered it. How are usb charging port and 3G signal linked??
Sent from my CyanogenMod 10 powered GT-I9100 using xda premium
Click to expand...
Click to collapse
The USB board has the contacts to connect to the antenna in the back of the chassis. So replacing it with a sub standard part is affecting signals
Sent from my GT-I9100
duguet said:
viva! the party from Hong Kong worked for me. For everyone which needs this part search for
the vendor on google. I am using my phone for the 2100Mhz 3 g band.
Cheers!
Sent from my GT-I9100 using Tapatalk 2
Click to expand...
Click to collapse
Please let us know the vendor name on Ebay. As mentioned in my previous post, the vendor (user name yake-gandi3388) agreed to change my replacement with no extra charges. I installed the new piece...the signal is a bit better than previous one...but still lower than the original.
Can anyone advise a vendor that sells replacement part Flex Cable with a strong signal?
Blue Angel o.O said:
Please let us know the vendor name on Ebay. As mentioned in my previous post, the vendor (user name yake-gandi3388) agreed to change my replacement with no extra charges. I installed the new piece...the signal is a bit better than previous one...but still lower than the original.
Can anyone advise a vendor that sells replacement part Flex Cable with a strong signal?
Click to expand...
Click to collapse
I an sorry for for the delay. I live in Germany and I use O2 ( umts frequency in the 2100 Mhz band) . I ordered the part from Hong Kong which Geronymous cited, didn't want to make specific advertising. The user is mingxing200808.
Regarding the question why does this affect the antenna, it is because antennas need to have a certain capacitive load in order to be adjusted and to transmit in a certain frequency range. If the antenna is not adjusted the signal will be reflected back . This capacitance is defined by the geometry of the antenna and might be changed/adjusted by elements connected to the end of the antenna. So the flex part acts as an adjusted capacity load for the antenna.
This is a very rough description, but I hopeit helps.
Greetings,
Sent from my GT-I9100 using Tapatalk 2
Finally got my 3rd USB board and my signal has improved a lot! Hurrah! Got from tjuk1980 on eBay. This board is a darker blue, looks a lot better than my second board which was a lighter greener colour, the logo and writing didn't seem as clear as it does on the new one. Getting 3 of 4 bars on H+ at home where as before it would stay on G and if it did pick up 3G/H by chance it wouldn't show any bars.
Sent from my GT-I9100
Edit: picture of the dodgy board - this gave me crap service so avoid that one!
I've been working on this problem off and on since the summer and have read through pretty much everything I can find (some similar posts with no resolution). After about 6 months of using a Galaxy S6, I want my Xperia back.
Long story short, I replaced the screen on my Xperia Z3V a while back. I'd already paid Sony for one screen on this phone and didn't want to do it again (wish I did). After I replaced the screen, the phone worked fine except I no longer had "proper" cell/4G signal. When I say "proper," the signal randomly appears (4 bars/-87dBm) and randomly disappears (-120dBm). I can't find any pattern to this. In some places with very good signal such as the Verizon store, the phone will try to activate but will fail to make calls or receive texts after.
List of what I've tried so far:
- factory reset
- new SIM from Verizon
- new antenna cable (blue coax cable, clips into side of phone)
- new antenna
The part that really confuses me is that disconnecting the blue coax cable has no effect. I.e., if I disconnect the cable while the phone claims to have signal, nothing changes. My assumption is that signal would instantly drop.
Is there anything worth trying before writing the phone off?
Possibly related... There is a white putty along the bottom of the battery that turns into a flat white cable which runs up the length of the battery to the WiFi antenna. Can anyone tell me what this might be? I can't find pictures describing this phone anywhere.
Thanks in advance.
I have a Z3 and the blue coax cable is the one for signal, in this case it seems either it is broken or something along those lines, as I have the same problem in my z3 but I know why because I had broken the coax connector so the signal issue. Try checking the antenna at the bottom or the connector on the motherboard itself
Neelkanth said:
I have a Z3 and the blue coax cable is the one for signal, in this case it seems either it is broken or something along those lines, as I have the same problem in my z3 but I know why because I had broken the coax connector so the signal issue. Try checking the antenna at the bottom or the connector on the motherboard itself
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That's true. You probably damaged the coax connector on either the motherboard or the loud speaker side. The proper procedure for removing the blue cable is holding down the socket with one tool and removing the cable with another. And best is to remove the speaker module without touching the cables...
Hmm... I did not realize the coax cable was quite that fragile. Lesson learned. It seems impossible to find brand new replacements for this particular phone, I wonder if Z2 or Z3 parts would fit.
The old iPhones I've successfully replaced screens on seem like toys next to the Sony...
Hi there.
I have a G5 as my backup phone. Recently, I've replaced the fingerprint scanner (it stopped working as a button, no cleaning would help, so I've bought new part online and replaced it), and after that I have no signal (-1dbm 99asu). Not even an alarm call is possible.
From my research, the antenna module is the bottom slice of the phone, you attach the battery to (one with mic, USB-C and bottom speaker)? I have both original bottom part and a Cam+, no signal on either of them. Where else should I look for any damage, that would lead to my problem - no signal at all?
I have a similar problem. The signal is very low everywhere, I tried to clean all the contacts between the bottom part and the phone, and nothing changed.
Me too i have a problem with the signal since display change. How can i get it fix. The phone has very low signal and it has network only on 3g on LTE it hasnt any network and 2g signal doesnt have.
Изпратено от моят LG-H850 с помощта на Tapatalk
Well, the pcb or mainboard has a small flex type antena on the back of it, it's black and has some lettering on it and it connects using coaxial type push connectors, also the phone connects to the aluminum case via some exposed pins on the mainboard, the case acts as an antenna also, if you need pictures I can take some tomorrow, I work in a cellphone shop and I fix an LG g5 almost every day, we have some main boards laying around, you most likely bent one of the pins that connects to the case
nah i got the same problem here after disassemble the phone. I already clean all things that contacted with the backdoor or with mainboard but the problem still there. Only got 0-1 bar of 4g even it near the tower until it change to 3g with the same condition. but the 2g signal is always full bar.
Jc_master said:
Well, the pcb or mainboard has a small flex type antena on the back of it, it's black and has some lettering on it and it connects using coaxial type push connectors, also the phone connects to the aluminum case via some exposed pins on the mainboard, the case acts as an antenna also, if you need pictures I can take some tomorrow, I work in a cellphone shop and I fix an LG g5 almost every day, we have some main boards laying around, you most likely bent one of the pins that connects to the case
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so is it located on the mainboard or part of screen? could you take some picture of it :crying:
Jc_master said:
Well, the pcb or mainboard has a small flex type antena on the back of it, it's black and has some lettering on it and it connects using coaxial type push connectors, also the phone connects to the aluminum case via some exposed pins on the mainboard, the case acts as an antenna also, if you need pictures I can take some tomorrow, I work in a cellphone shop and I fix an LG g5 almost every day, we have some main boards laying around, you most likely bent one of the pins that connects to the case
Click to expand...
Click to collapse
maybe post foto where is gsm ahtenna?