Hardware Repair Series : 7650 Flex Fix with pictures and explanation in details - GSM-Forum

GSM Coolhawk · 07-23-2004, 02:02

@All

One more for today.

havent you all been pissed off when a 7650 flex cable have been ripped, either by the client, or even worse, by yourself, done that a few times myself

duhh

Those flexies are still quite exspensive, and it take some time to fit a new new, but what if you dont have a new one ? Then your busted, and clients start screaming hehe (C) Crew

Well I did that some time ago with a clients phone upss, and did not have any flex cables in stock at the time, and wouldn't have for a few weeks to come. soooo lets get started.

Tools needed for this fix :

1 : A good stereo microscope or lupe, min 20x, I prefer to do this fix in 40x magnification !
2 : 30-50 W SMD soldering iron
3 : Cobber wire 0.2 mm
4 : Good flux, I recommend ERSA - FMKANC32-005 non-clean cream.
5 : Soldering tin 1.5 - 2 mm with core flux
6 : Doctors scalpel
7 : Some very steady hands

Note that this fix can ONLY be done if the flex cable have been ripped just above the pads on the PCB, if it's ripped other places, this fix does not apply.

First you'll have to cut the flex just where the rip has occured and make a nice strait cut all the way. Find your scalpel. In order to have the flex steady, I always put it back on the PCB and line it up with the pads.

What you do now is to start scraping of the plastic of the flex very very carefull, the lines are VERY fragile, one mistake and you can throw that flex away for good. As soon as you reach the thin cobber line under the plastic, take it even more slowly, you have to clear at least 2-3 mm of the line. When you after some nervous time have done this to the hole flex, it's time to prep it.

Apply flux on all the lines which are now in the free, and after prep them with some good solder. After this you can start to mount the wires. You need something like 3 mm on the flex and 3 mm on the pad. What I do normally in this kind of operation is to have a long cobber wire at hand, start to solder it to the flex first, then the pads, then you cut it, it's nearly impossible to control a 6 mm long patchwire trust me.

Under here you'll see the finished result of a ripped flex, which I've fixed by the above method, you should have an idea now what this takes.

Under here is a close up in 60x magnification.

Hope this helps out some folks. Good luck, and dont blame me for busted boards, do this at you own risk !

And please, do not start any "send me too" posts of any kind, they will be deleted. I do not have it whatever it might be. For your information I use a Novex AP-8 stereo microscope, and pictures posted here is taken with a QX3 Intel (tm) digital toy microscope, you can find those nice little ones on Ebay for around 60 Euro.

Regards

teerak2uk · 07-23-2004, 10:37

just look on eBay much easier and less hassle

GSM Coolhawk · 07-23-2004, 13:43

@teerak2uk

Yeah Nice China copies, where around 10% is faulty

. And furthermore this fix was in emergency, in case you did not have any flexies in stock. Not everybody with this problem lives in UK with free postage, not to mention eventual WU transfer + postage outside UK + waiting time.

Regards

dydycom · 07-31-2004, 23:58

HE IS A british guy WHAT DO U KNOW??

I MUST SAY THAT I TRIED SEVERAL TIMES THAT PROBLEM BUT..... LOST MY PATIENCE.
TO POST HERE, MEANS ALLOT, THATS TO BE APRECIATE!!

GOOD JOB MATE!!!

uniden · 08-12-2004, 16:07

WOW man.. I have to say you have the nervous..

BR
uniden
slovenia

gsmwarior · 08-26-2004, 19:35

*** job man i dont have patience to do

dexter2 · 09-12-2004, 16:49

hi, this is new guy try 2 come out well just the ways u all are coming. i love u all for making d world sweet place for all thanks for all your doing gbenga

Luis Carvalho · 09-22-2004, 12:49

good jog man.
can i go to greece and work with you?
very good, u the tecnition.

GSMBlade · 11-16-2004, 03:40

This is art!! Man you have the nerves!!

But to make all this I can lost all day, and for 5-6 € I get new flat with connector and fix that for 5 minutes, and the customer pays it!!

BR

samkay · 01-20-2005, 12:24

Thanks men it works 100%

iwi · 04-30-2005, 12:10

what a flex! u nid more patience tu do this

debscom · 05-04-2005, 01:37

Thanks guys good work well done.

GamalyGsM · 06-27-2005, 18:30

Thanks man its great work and work 100%

gsm4sp · 10-14-2005, 00:53

Thaaaanx Nice Workkkk

gsm st · 11-12-2005, 10:35

hi@all
sir i have a 6230i 2.5.8.0.key not working plz help me thanks
have a nise day

07-23-2004, 02:02	#1 (permalink)
GSM Coolhawk No Life Poster Join Date: Dec 2001 Location: United Arab Emirates, Dubai Age: 52 Posts: 1,269 Member: 7751 Status: Offline Thanks Meter: 74	Hardware Repair Series : 7650 Flex Fix with pictures and explanation in details @All One more for today. havent you all been pissed off when a 7650 flex cable have been ripped, either by the client, or even worse, by yourself, done that a few times myself duhh Those flexies are still quite exspensive, and it take some time to fit a new new, but what if you dont have a new one ? Then your busted, and clients start screaming hehe (C) Crew Well I did that some time ago with a clients phone upss, and did not have any flex cables in stock at the time, and wouldn't have for a few weeks to come. soooo lets get started. Tools needed for this fix : 1 : A good stereo microscope or lupe, min 20x, I prefer to do this fix in 40x magnification ! 2 : 30-50 W SMD soldering iron 3 : Cobber wire 0.2 mm 4 : Good flux, I recommend ERSA - FMKANC32-005 non-clean cream. 5 : Soldering tin 1.5 - 2 mm with core flux 6 : Doctors scalpel 7 : Some very steady hands Note that this fix can ONLY be done if the flex cable have been ripped just above the pads on the PCB, if it's ripped other places, this fix does not apply. First you'll have to cut the flex just where the rip has occured and make a nice strait cut all the way. Find your scalpel. In order to have the flex steady, I always put it back on the PCB and line it up with the pads. What you do now is to start scraping of the plastic of the flex very very carefull, the lines are VERY fragile, one mistake and you can throw that flex away for good. As soon as you reach the thin cobber line under the plastic, take it even more slowly, you have to clear at least 2-3 mm of the line. When you after some nervous time have done this to the hole flex, it's time to prep it. Apply flux on all the lines which are now in the free, and after prep them with some good solder. After this you can start to mount the wires. You need something like 3 mm on the flex and 3 mm on the pad. What I do normally in this kind of operation is to have a long cobber wire at hand, start to solder it to the flex first, then the pads, then you cut it, it's nearly impossible to control a 6 mm long patchwire trust me. Under here you'll see the finished result of a ripped flex, which I've fixed by the above method, you should have an idea now what this takes. Under here is a close up in 60x magnification. Hope this helps out some folks. Good luck, and dont blame me for busted boards, do this at you own risk ! And please, do not start any "send me too" posts of any kind, they will be deleted. I do not have it whatever it might be. For your information I use a Novex AP-8 stereo microscope, and pictures posted here is taken with a QX3 Intel (tm) digital toy microscope, you can find those nice little ones on Ebay for around 60 Euro. Regards

07-31-2004, 23:58	#4 (permalink)
dydycom Freak Poster Join Date: Jan 2003 Location: hell (gsm bussines) Age: 49 Posts: 142 Member: 19875 Status: Offline Thanks Meter: 3	oy oy oy HE IS A british guy WHAT DO U KNOW?? I MUST SAY THAT I TRIED SEVERAL TIMES THAT PROBLEM BUT..... LOST MY PATIENCE. TO POST HERE, MEANS ALLOT, THATS TO BE APRECIATE!! GOOD JOB MATE!!!

09-22-2004, 12:49	#8 (permalink)
Luis Carvalho Junior Member Join Date: Sep 2004 Age: 57 Posts: 11 Member: 82426 Status: Offline Thanks Meter: 0	good jog man. can i go to greece and work with you? very good, u the tecnition. Last edited by GSM Coolhawk; 01-09-2005 at 06:42.

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07-23-2004, 10:37	#2 (permalink)
teerak2uk No Life Poster Join Date: Mar 2003 Location: GB Age: 54 Posts: 657 Member: 24791 Status: Offline Thanks Meter: 35	just look on eBay much easier and less hassle

07-23-2004, 13:43	#3 (permalink)
GSM Coolhawk No Life Poster Join Date: Dec 2001 Location: United Arab Emirates, Dubai Age: 52 Posts: 1,269 Member: 7751 Status: Offline Thanks Meter: 74	@teerak2uk Yeah Nice China copies, where around 10% is faulty . And furthermore this fix was in emergency, in case you did not have any flexies in stock. Not everybody with this problem lives in UK with free postage, not to mention eventual WU transfer + postage outside UK + waiting time. Regards

08-12-2004, 16:07	#5 (permalink)
uniden Freak Poster Join Date: Aug 2000 Location: slovenia Age: 47 Posts: 157 Member: 1970 Status: Offline Thanks Meter: 1	WOW man.. I have to say you have the nervous.. BR uniden slovenia

08-26-2004, 19:35	#6 (permalink)
gsmwarior Junior Member Join Date: Oct 2002 Location: portugal Age: 51 Posts: 19 Member: 17108 Status: Offline Thanks Meter: 0	*** job man i dont have patience to do

09-12-2004, 16:49	#7 (permalink)
dexter2 Freak Poster Join Date: Sep 2003 Location: nigeria Age: 46 Posts: 187 Member: 38959 Status: Offline Thanks Meter: 0	hi, this is new guy try 2 come out well just the ways u all are coming. i love u all for making d world sweet place for all thanks for all your doing gbenga

11-16-2004, 03:40	#9 (permalink)
GSMBlade No Life Poster Join Date: Mar 2001 Location: Croatia Age: 45 Posts: 723 Member: 3508 Status: Offline Thanks Meter: 71	This is art!! Man you have the nerves!! But to make all this I can lost all day, and for 5-6 € I get new flat with connector and fix that for 5 minutes, and the customer pays it!! BR

01-20-2005, 12:24	#10 (permalink)
samkay Junior Member Join Date: Jan 2005 Location: I live in Kaduna Nigeria Age: 45 Posts: 4 Member: 106335 Status: Offline Thanks Meter: 0	Thanks men it works 100%

04-30-2005, 12:10	#11 (permalink)
iwi Major Poster Join Date: Apr 2005 Age: 45 Posts: 46 Member: 134084 Status: Offline Thanks Meter: 1	what a flex! u nid more patience tu do this

05-04-2005, 01:37	#12 (permalink)
debscom Insane Poster Join Date: Apr 2004 Location: Lagos,Nigeria Age: 44 Posts: 79 Member: 62953 Status: Offline Thanks Meter: 6	Thanks guys good work well done.

06-27-2005, 18:30	#13 (permalink)
GamalyGsM Freak Poster Join Date: Jun 2005 Location: E G Y P T Age: 35 Posts: 380 Member: 154404 Status: Offline Thanks Meter: 131	Thanks man its great work and work 100%

10-14-2005, 00:53	#14 (permalink)
gsm4sp Freak Poster Join Date: May 2005 Age: 45 Posts: 489 Member: 143156 Status: Offline Thanks Meter: 95	Thaaaanx Nice Workkkk

11-12-2005, 10:35	#15 (permalink)
gsm st No Life Poster Join Date: May 2005 Location: GULMI Age: 49 Posts: 2,181 Member: 143007 Status: Offline Thanks Meter: 141	hi@all sir i have a 6230i 2.5.8.0.key not working plz help me thanks have a nise day