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 have a second hand Galaxy S2 which was unlocked to all networks and randomly the phone would connect to driving mode. I used GoLauncher EX to delete Voice control but then it started showing that it was charging constantly. After a lot of research I found the problem was in the charging port.
I ordered a new charging port online and I've put it in instead of the old one and now the charging problem is gone, but now my phone gets no service on a Three UK sim, I'm quite sure it wasn't on Three UK to begin with.
Is it possible that changing the charging port might have locked the phone to the original carrier again?
and is there anyway to unlock it(without root) or get it working again a different way?
(This is my first post. Forgive me if I've made any mistakes. )
Got quite a few views. Does this mean no one has any idea on what it could be?
Take a look at the antenna wire sometime you touched it and it's not connected properly
Yeah I have seen a lot of people lose signal who replace that port. I'm pretty sure it has something to do with the antenna. Make sure you have knocked it by mistake
Sent from my GT-I9100 using xda app-developers app
I experienced the same problem with my Samsung S2. I had destroyed the charging port by being careless when charging it which meant my phone would not charge at all; although if I was lucky I would get about 10% charge every day.
To resolve the problem, I bought a cheap charging port flex cable off ebay for about £4.00 which I thought was a bargin. After taking the phone apart (with help from a YouTube video) I replaced the port, turned the phone on and it charged perfectly. Then all of a sudden I lost all signal. I moved around the house, hoping to get the slightest bit of signal but no, nothing. I did a lot of research online as to why this has happened and everyone said it was to do with the antenna cable that runs along the left hand side of the phone so my immediate thought was to buy a new one. I did a factory reset to see if that helped but it did not. As I was desperate, the following day I went into town to see if I could find a shop that sold an antenna wire. I went in shop after shop but nowhere sold what I was looking for. I went into a shop and described my problem to the man behind the counter, and he knew exactly what was wrong. On the flex cable there is "REV" followed by a number, and he told me that if the replacement number is not the same as the original then the phone will have no service.
In the photos you will see my original cable that was "REV2.3" and my replacement cable that was "REV2.2".
Long story short... when replacing the charging port make sure the replacement flex cable has the same REV number as the original otherwise you will have no service. Your problem is not related to the antenna wire.
I hope this helps!
solution posted here
http://forum.xda-developers.com/galaxy-s2/help/weak-signal-reception-changing-micro-t1950114/page4