yashsingh1/xdaforums huggingface dataset:
[Galaxy S II Q&A, Help & Troubleshooting] underhuggare:
We cut both boards, the new and the old one! Since the antenna part from the old board is the one that's working as it should, you want that one. And since it's the USB part from the new board that's working, you want that one. So what you said; put back "the old left side" and "the new right side" in the phone.
[Galaxy S II Q&A, Help & Troubleshooting] TheGizmoJo:
Ah, okay thanks! Well it turns out my phone has the REV 2.3 board in it and I ordered REV 2.2. Will I be able to use the USB portion of the 2.2 board? I'm just scared of cutting the original board and then it not be able to work at all.
[Galaxy S II Q&A, Help & Troubleshooting] Hollyanna52210:
just for future people looking for help

the boards you are getting are not bad, the rf on them are different. If you look under where it says sgh1717 etc..you will see another smaller number and it ends with an side oval thing with rf in the middle. these have to be the same to. that is the frequency that your antenna runs off of. learned this the hard way. so always check this number on the part before ordering. Good luck
[Galaxy S II Q&A, Help & Troubleshooting] JoeBlackH:
thank you so much!

I'd like to give another report of success of the cutting method, thanks Serathian! and thanks to underhuggare!!!! whitout your reply i would not been hable to do the cut! but, thanks to you i decided to du the cutting methor and now y have full and strenght signal!!!! man thanks so much!
[Galaxy S II Q&A, Help & Troubleshooting] pigowar:
reporting success

I'd like to give another report of success of the cutting method, thanks Serathian!:victory:

Original was rev 2.2 R.B81 39

replacement is rev 2.2 R.B81
[Galaxy S II Q&A, Help & Troubleshooting] balse:
I had the same problem when incorrectly installed rubber gasket. You need to put microphone into split in it and check that microphone sits in place (put gasket before you insert board into phone). Also check that the hole in the bottom side of rear cover and in the rubber gasket are free from dirt.

I had the same problem of weak signal after replacing usb board (corrosion and as result overvoltage errors and etc).

I bought straightway 2 from same seller "GT-i9100 rev2.4 R.C44 17"

both had the same weak signal problem. I also tried to replace RF cable without success.

After reading this thread, I tried to resolder 4 small parts between connector and antenna pins (probably matching capacitors and inductors) from old board to new one.

when I removed them from new one, I found that RF connector short-circuits. When I disordered it there was too much solder beneath it that short-circuited central pin to connector's chassis (on both new boards that I get).

After re-soldering this connector into place with a little quantities of solder and putting components from old board, the signal returned to good condition :) (+1 more dis-assembly to fix incorrectly sitting microphone's rubber gasket:)

probably fixing short circuit beneath rf connector may solve the problem without need to replace another components.

So It is one more solution without need to break both boards into 2 parts.

thanks
[Galaxy S II Q&A, Help & Troubleshooting] marttin123:
I gave half of the original, half with USB bought from ebay. And while everything works. :fingers-crossed:

I made a cutting with a sharp knife. :good:
[Galaxy S II Q&A, Help & Troubleshooting] Emrets61:
You guys are just f* awesome! I cut 'em and IT'S WORKED! :laugh:
[Galaxy S II Q&A, Help & Troubleshooting] Franceschiello:
I cut also and work.

Now I write with my i9100 with "new" high speed connection. Thanks guys.
[Galaxy S II Q&A, Help & Troubleshooting] underhuggare:
Haha great to hear guys!
[Galaxy S II Q&A, Help & Troubleshooting] irish3477:
Thanks for bringing closure to my frustration.

I just wanted to tell you guys I just registered to tell you how awesome you are. I have struggled with the cause of the signal loss for months. To make matters worse I have two phones with identical problems, because I replace the USB ports in both with the i9100 boards. Did not make the connection for a while though, because locally signal was still strong, intermittently it was very erratic though. When my wife travelled to South Carolina for a week, the phone would not work at all. I thought it was a freak occurence till we took another trip a couple months ago and mine would not work in SC either. Worst part is they were both bought in SC. I spent 5 hours going from AT&T store to store and blaming them. I have researched all over, run various roms, various modems, used various apps, went to ics, back to gingerbread, to jellybean....terrible. I was so mad, and now I feel stupid. I still have not fixed ours, but I'm certain this is it. I have to find the old ones in whatever corner they are in to try the cut method. I hope neither got thrown out, I compulsively keep everything so I think I just have to find them. Just wanted to say thanks again, and I will let you know if it fixes AT&T i777 ASAP.
[Galaxy S II Q&A, Help & Troubleshooting] shiboby:
What are the different things people are cutting with?Can someone post a bottom side of their cuts so I can see where I need to cut? Thanks guys for this thread, I've been suffering for 2 months trying different parts!
[Galaxy S II Q&A, Help & Troubleshooting] JediDwight:
Above somebody said to use a sharp knife, so I used a snap off type box cutter to saw mine. It's like an Exacto knife, just with a long blade.
[Galaxy S II Q&A, Help & Troubleshooting] microMXL:
I may have to do this too, new usb is not getting good reception
[Galaxy S II Q&A, Help & Troubleshooting] shiboby:
The cutting Methode works great. Just make sure you don't interfere with the microphone when you put the tape across.
[Galaxy S II Q&A, Help & Troubleshooting] jcmarx:
Much thx guys. I fixed both of my daughters S2's with the curing method gong to try it next on my wife's n7000. They all work the USB loose from trying to talk/text while it's plugged in. Will repost if similar works on n7000 also but for the s2 was eas
[Galaxy S II Q&A, Help & Troubleshooting] jcmarx:
Well at least it worked on the s2... No such luck for the n7000 it has different lay out
[Galaxy S II Q&A, Help & Troubleshooting] rekamyenom:
I have a T-Mobile SGH-T879 Note 1 that I ordered the replacement Charging port assembly off eBay for. The one they sent says SGH-i717 (AT&T Version), they are supposedly interchangeable. The funny thing is with mine, after replacing the Old Part with the new, the charging port is now fixed but I do not get Signal "in my house ONLY". If I take the phone anywhere else, it works fine, 3 other cell phones on T-Mobile work just fine in my house as well (any other cell phone in my house works fine). Here's the Kicker, it worked fine for 5 days after replacing the part, then one day, no signal "in the house only".

I will try the cutting method tomorrow and report back. Hope this works! :fingers-crossed:

BRILLIANT THREAD BTW !!! GOOD **** !!! :good:
[Galaxy S II Q&A, Help & Troubleshooting] jaccuse:
Thank the stars for this thread!

I tried to replace my board, but ignorantly bought the wrong revision the first time round. The usb port was fixed, but signal was rotten.

I then replaced it with the correct 2.3 board, but found the same problem. I thought I had damaged my phone and was very annoyed.

Then I found this thread. "Ideal", I thought, but then I couldn't find my original board and thought I had binned it as useless. Rage!

Then my friend offered me an old I9100 of his, as he'd had it replaced through insurance due to a firmware issue. Finally, I thought I could fix my phone, but his was a rev 2.2, and turned out to be useless.

Two months later and I find the old board underneath a cushion on the couch. I've utilised the half and half method here, and now I have a working phone :)

With regards to the cutting... I didn't bother with a knife/scissors/tape. I just folded the board over broke it off just at the screw hole. I put both parts into the phone without taping. Works fine. You could make sure the antennae side underlaps the other slightly, that way it can be screwed down.
[Galaxy S II Q&A, Help & Troubleshooting] simonafloat:
Awesome thread

Hi all

I got my replacement part from an ebay dealer last week and had the same reception issues so I dug the old flex cable out of the bin, re-used the original half of the board and it now works like a charm.

Very happy with the outcome, this is what the internet's all about! Give yourselves a big pat on the back :)

Simon
[Galaxy S II Q&A, Help & Troubleshooting] wrench588:
Another successful cut

Just wanted to send another "Thank You" to you all on the board. I replaced my USB flex cable vers. 2.2 from ebay seller in HK. Original was 2.3, and of course signal was crap. I found this posting, and after the slice, it works perfectly! Don't be afraid if you're reading this, cut away!
[Galaxy S II Q&A, Help & Troubleshooting] catzilla:
Reporting another great success using the cutting method for marrying two unrelated parts, original with bad usb and new with bad antenna.
[Galaxy S II Q&A, Help & Troubleshooting] ronlut:
Wow! Awesome info in this thread. Thanks so much everyone.

A quick question: is there a reason why not to buy a replacement part for about 4$ (instead of spending ~10$) if anyway I'll cut it?

Thanks.:good:
[Galaxy S II Q&A, Help & Troubleshooting] keristop:
compatibility between rev 2.2 and rev 2.3

I am trying to get a firm status about the compatibility between two different revisions of the USB flex cable...

Some people say they are incompatible based on the fact that they tried one or two rev 2.3 without result and that it finally worked with a rev 2.2... But apparently there are a lot of defectuous boards (a lot more than one out of two), so it does not mean that the 2.3 were incompatible...

Has anyone successfully changed a rev2.2 to a rev2.3 ?

thx
[Galaxy S II Q&A, Help & Troubleshooting] MistahBungle:
Read KeithHarris39's guide in the General section/ask him in his thread; he's the resident usb board/port expert.
[Galaxy S II Q&A, Help & Troubleshooting] keristop:
thanks

I've had some difficulties to find him... do you mean keithross39 ?

--> http://xdaforums.com/showpost.php?p=43610545&postcount=39

apparently everybody mixes up with "Harris" :)

nevertheless, I couldn't find a guide using the search page... :o
[Galaxy S II Q&A, Help & Troubleshooting] keithross39:
Lol @ mistahbungle .....

That'd be keithross39........

I've been trying to get Samsung to give me details about the compatibility issues between the various revisions of the boards, but they've been about as forthcoming with the info as they have been with the exynos source code.......

But everything I've read to date indicates that these boards are NOT cross compatible. So my advice is.....

Replace with the same rev number......

The only other piece of advice I'd offer.......wherever you get the board, do your best to research the sellers' validity first.......if the sellers registered address is in China, there's a high likelihood that the board is *probably* fake..... (Sorry if that offends, but that's the way it is....there is a fully fledged industry in China dedicated to producing OEM copies of erm *questionable* quality....)
[Galaxy S II Q&A, Help & Troubleshooting] keristop:
too bad... I was wondering If I could ask my rev 2.3 seller to replace it, hoping another one would work...

the difficulty is that everybody, including I suppose the store where I bought my rev2.3, sells boards from over there... I wonder if there are boards which are made somewhere else! It's the same for the batteries...

Thx anyway!
[Galaxy S II Q&A, Help & Troubleshooting] keithross39:
If you go to Samsung's website, there should be a link that takes you to a page that displays the nearest authorised service outlet along with their contact details.......

In theory they *should* stock genuine parts. It might be possible to contact your nearest outlet to see if they would supply you with the part......

They might charge a bit more, but at least you can be sure of the part......

...or on the other hand, they might insist that they repair it themselves.......

Can't hurt to contact them though.......
[Galaxy S II Q&A, Help & Troubleshooting] mrocca:
I've replaced an original v2.2 with a Chinese v2.3 and my signal is as strong as with the original. Bought in Argentina, probably from an eBay reseller
[Galaxy S II Q&A, Help & Troubleshooting] keithross39:
Lol....that Chinese 2.3 *might* have been a copy of a 2.2 but stamped with 2.3......

My point is.....you just don't know exactly what you are getting when you purchase from China.
[Galaxy S II Q&A, Help & Troubleshooting] mrocca:
Your point could be certainly right. There is much uncertainty about these products, when I phoned them they told me V2.3 is backwards compatible with V2.2, not the other way, therefore I'll get a V2.3, but once at the shop the technician gave me 2 cards to try, one V2.2 and the other V2.3.

I installed V2.3 just in case I broke it in the procedure and keep the V2.2 for a second try. Luckily the replacement procedure went well and I didn't have to replace it for the V2.2.

In case I got low signal with V2.3 I would have tried the cut procedure mentioned in this thread and mixed USB port from the new card with the antenna part of the original.

Best Regards
[Galaxy S II Q&A, Help & Troubleshooting] keithross39:
I guess it *would* make sense that there was/is possibly backwards compatibility, and I can see why the reverse isn't possible......

For those with rev 2.2, the advice is still the same.....when replacing, match the rev number.....,..
[Galaxy S II Q&A, Help & Troubleshooting] Logic Zero:
Is there a way to know which revision board to get for your mainboard without the original? I got a replacement phone from carphone warehouse and it was a few months after they gave it to me that I realized my signal was absolutely terrible (don't use this phone too much). I'm thinking they've replaced the flex connector because of a broken usb port, but have got the wrong revision. Now I need to backtrack and find a revision that works since I have no idea what revision flex connector was in there previously :(

Any info on matching the flex connector revision to something like a mainboard identifier? Any help much appreciated.
[Galaxy S II Q&A, Help & Troubleshooting] keithross39:
I have often wondered that myself.....but as the number of people replacing main boards is very small (mainly due to the horrendous cost), the data on whether there are different main board revisions would be very hard to acquire.......

Another poster has mentioned being told that the USB boards are reverse compatible..... So if you currently have a rev 2.4 board, you could try replacing it with a rev 2.3 or 2.2......

Just a suggestion.....
[Galaxy S II Q&A, Help & Troubleshooting] alb989:
cut methods work

hi all, i registered in this forum to report my experience. I have the reception problem with the replace that the ebay seller sent to me and i tried to fix it cutting the antenna module from the old piece and... it works!! The original part is rev 2.2 and the new have rev 2.3. Thanks to all :laugh: this is a photo of my work ;)
[Galaxy S II Q&A, Help & Troubleshooting] shiboby:
Not true, I've had higher revisions that don't get good reception. The other in (ex c92) that come after also indicate differences in the board. Regardless, atleast higher revision do work. in my experience lower revisions than the original don't work at all.
[Galaxy S II Q&A, Help & Troubleshooting] Logic Zero:
Makes sense...backwards compatible would imply newer revisions are compatible with older mainboards. Going down in revision is probably going to give you problems!
[Galaxy S II Q&A, Help & Troubleshooting] norskedroid:
I've been reading this and other threads prior to ordering a replacement part. My original board is Rev. 2.2 R.B61. Tried cleaning blowing brushing the port with no results.

As an alternative to the cutting technique, can one replace just the USB Port? Parts are readily available, at less cost than the board (although not by much, true), and compatible with all Rev. numbers. Is this not a preferred alternative to cutting the boards? Or does a USB Port replacement require soldering? I didn't remove the board, just took off the back phone cover to check the Rev. number.

Thanks in advance for all who have contributed to this thread.
[Galaxy S II Q&A, Help & Troubleshooting] keithross39:
Yes you can replace just the port.....but it WILL need soldering......
[Galaxy S II Q&A, Help & Troubleshooting] norskedroid:
Have many tried this? I only came across the one instance where the person had applied too much solder.

Wonder if anyone has replaced just the port yet still been unable to connect to computer.
[Galaxy S II Q&A, Help & Troubleshooting] keithross39:
The most frequent part to fail is the port itself.....

I'm sure other parts DO fail, which may in turn lead to symptoms similar to those of a damaged port, but in the main, it's wear and tear on the port that causes the issues...put simply.....they wear out. I've always thought that a connector like this is totally unsuitable for the use to which it is being put.....it's simply too fragile......

In terms of de soldering/re soldering the port....the usual advice applies...

1) remove as much of the molten solder as possible from each solder point.

2) find a low power fine tipped soldering iron to do the job

3) try to minimise the length of contact that the soldering iron has with the circuit board.....to reduce the risk of other damage due to overheating

4) examine the board...post soldering...with a magnifying glass if necessary...to make sure there are no unintentional short circuits.......
[Galaxy S II Q&A, Help & Troubleshooting] jonny_blagwind:
top work again xda! :D

Just had this issue myself I've cut the boards so they fit nicely though amazing work keep it up :D
[Galaxy S II Q&A, Help & Troubleshooting] tiner:
I replaced that part and I lost even Wifi signal too.

I've cut it and know I'm getting strong WiFi signal again but strong phone signal hasn't turn back yet.

Why could it be? The white cable, what's its function? Could it be damaged? But i'm getting strong WiFi signal...

Thanks.
[Galaxy S II Q&A, Help & Troubleshooting] tiner:
Solved, it seems that the loud speaker has an antenna. It wasn't plugged correctly.

Thanks!

Enviado desde mi GT-I9100 mediante Tapatalk
[Galaxy S II Q&A, Help & Troubleshooting] keithross39:
That white cable has nothing to do with the speaker......it's what takes the (2g/3g) signal from the built in antenna to the phone......

Sent from my Markox powered, KitKatted S2.....
[Galaxy S II Q&A, Help & Troubleshooting] kr33per:
Hi Guys,

I have a big problem here. When i received a REV2.2 board I only test the USB. It was working so I throw away my old board.

I've no network with the REV2.2. I tested a REV2.3 founded on an old friends phone and it is juste a little better but not enough.

Did you guys have any idea of how i can know the kind of my original board?

Or perhaps the most common.

Thanks.

PS: It's for french network
[Galaxy S II Q&A, Help & Troubleshooting] shiboby:
Has your trash been picked up? If not, it's time to go find your original board.
[Galaxy S II Q&A, Help & Troubleshooting] kr33per:
unfortunately yes

Maybe it's possible to find some Serial number on the mother board?
[Galaxy S II Q&A, Help & Troubleshooting] kr33per:
Anyone ? :(

I'm desperate. I found REV0.3 REV2.4 REV1.5 on ebay.

Maybe one of the 3 will work. But which?
[Galaxy S II Q&A, Help & Troubleshooting] shiboby:
For every Revision there were up to 100 variants made. Not only do you need to match the revision but the variant, which is hard to do. Because many of us couldnt find the variant someone figured the cutting method out. Without the board I don't know how you'd find the revision and variagion numbers
[Galaxy S II Q&A, Help & Troubleshooting] kr33per:
I just test another board from a friends phone and it's work.

Now i need to find a compatible one.

The board is "REV2.3 R.CA2"

Anyone know were I can't find the same board?
[Galaxy S II Q&A, Help & Troubleshooting] keithross39:
You could try the suppliers listed in this thread.......

http://xdaforums.com/showthread.php?t=2335961

Sent from my Markox powered KitKatted S2
[Galaxy S II Q&A, Help & Troubleshooting] dcavni:
I also tried with cutting because new board with the same revision number but different other numbers didn't work. It must be some diference within those few elements on a board (probably resistors). It works perfectly now. Why throwing away perfectly good phone if there is a way to fix it.
[Galaxy S II Q&A, Help & Troubleshooting] genilto:
Cutting Method!!!!

:good:

Cutting method really worked for me.

I have bought three USB flex port for my i9100.

No signal with any of them, just the original one get signal.

The other boards do not got signal, but I could charge the phone perfectly.

So, I cut 2 boards and it really worked for me.

I put the piece original for antenna and the piece from the new board I have bought for the charger port.

Perfect!!

Thank you very much guys!!
[Galaxy S II Q&A, Help & Troubleshooting] Galaxy pop Plus:
guys i've tried the cutting methode and it works perfectly but i have problem the file transfer with my computer didn't work it works as a charger when i put the cable (i've tried with another galaxy s2 and it works) is there any solution??
[Galaxy S II Q&A, Help & Troubleshooting] genilto:
Cutting Method Video!

Hi Guys!

I've made a video tutorial to show how to fix the problem of signal when changing the charging dock.

It's in portuguese, because I'm from brazil, but, maybe it can be useful for some reader of this blog.

This is the vídeo URL that is in my personal Blog, there's also an explanation about the precess there.

genilto.com/blog/?p=1500

thanks again
[Galaxy S II Q&A, Help & Troubleshooting] keithross39:
That has already been covered in the OP and here.....

http://xdaforums.com/showthread.php?t=2335961

My wife says I'm a phone geek....She's probably right :):D
[Galaxy S II Q&A, Help & Troubleshooting] kris_l:
Usb flex for i9100 is sold in many versions ex. 2.2, 2.3. you have to buy the same version as your orginal one in the phone. If you still have the old working one you can just cut off part responsible for signal because on that small board aerial circuit and usb are separated. Cut off as shown on photos.Combine usb part from board you've bought with aerial part form your working one.
[Galaxy S II Q&A, Help & Troubleshooting] shaglord:
Hi guys and gals...

I'm sitting in a similar boat as you. I can't quite wrap my head around the issue though.

Ordered two new ports and both ports show the same symptom. It's that the phone thinks it's charging when it's not. With the original board that problem disappears.

Before reading all the posts in this thread I was thinking that all ports out there have this problem but clearly you do not. Not a single post. Do I just have the worst luck or what? Any ideas?

The ports I've tried are R.BC4 v2.3 and R.C44 v2.4 and both seem to be junk. If only the signal was bad I could go ahead and do the cutting trick but not even the usb port works properly.

So is the solution to just pay more and more money until a good one shows? (I live in Germany)

Thanks for the help.

/Mike