How to Change Cobba, Flashing IC, UEM - GSM-Forum

Abdul971 · 10-24-2004, 07:45

Good day

I have problem on changing Cobba, Cause I had "Contact Service" on almost three 3310. I first tried to flash the phone but still "Contact Service" then I have rehot Cobba from the top and replaced it. The same "Contact Service" on the display. I tried it with the other two 3310 and all the same again.

Maybe, I am making a mistake, and I haven't seen anyone changing such IC's. Could anyone explain step by step on "How to Change Cobba, Flashing IC, UEM".

Does it make any damage on heating the board at the bottom when changing the Cobba or any other.

Hope to get more explanation on this.

pazeth™ · 10-24-2004, 08:47

to change IC BGA need skillfull and not just theory, try to find video repaire

mtmc · 10-24-2004, 08:48

hi
u have to apply some good flux on the ic u need to rehot then cirule heat the ic until you feel u can remove it ( but not remove just totch it from left to right so u see the ic move and return it self )

if this happen it mean u do a good reflow process

p.n good flux = good reflow

::Yasir:: · 10-24-2004, 16:22

Quote:

Originally Posted by mtmc

hi
u have to apply some good flux on the ic u need to rehot then cirule heat the ic until you feel u can remove it ( but not remove just totch it from left to right so u see the ic move and return it self )

if this happen it mean u do a good reflow process

p.n good flux = good reflow

"to rehot". u mean i need to have a hot air station around 250 degrees?

sumeda · 10-24-2004, 17:39

Abdul971,
my friend abdul you ask about how to replacing bga ic's but i'm not going to tell u how to replace them(read old posts). anyway in your contact service cases u din't mention what is the flasher you use to flash your phones. in nokia dct-3 phones like your 3310 contact service apear in six(6) types(according to old posts).one of them is when u switch on phone, phone on normal and insert sim card appear then contact servise show in display.this one can fix griffine,prodigy,etc....the other is directly contact service show in disply.most of times you cannot repair this trouble by using above mentioned flashers.to repair second one you have to use deajan or that kind of flasher.directly contact servise mean most of times corrupt data in eeprom area.damage imei,etc...so you have to write eeprom and rewrite imei ,update faid,to solve your problem.

i tell you above deatails according to my knolege b'cos i repairing 10-20 contact servise phones per month but i occationally replce cobba or flash ic to remove contact servise problem.
so abdul tell what kind of flasher u use to flash fist...

good luck.

Abdul971 · 10-25-2004, 04:52

When I power on the phone "Contact Service " appears. Actually I used Nokiaworkshop, and then tested with Eepromtool (there was a fail on Cobba Serial) Then used Nokiatool although IMEI was displayed.
Then I realised there was a problem with Cobba and changed it.

I know I making a mistake on replacing, that's why I need more explanation on replacing.

If anyone has a pic please share it with us.

daanish · 11-03-2004, 04:06

Abdul,
sumeda is right but one mistake you are making is acording to my knolege is that you are not replaceing the ic properly when you change coba the fone must say insert sim and it should be locked (4locks) then unlock the fone with nokia tool 18 update FAID reset software and full fectory set and see if the fone works ok if no then flash your fone and do all the steps i mentioned above good luck
wbr Daanish

10-24-2004, 07:45	#1 (permalink)
Abdul971 Junior Member Join Date: Sep 2004 Age: 52 Posts: 15 Member: 84095 Status: Offline Thanks Meter: 0	How to Change Cobba, Flashing IC, UEM Good day I have problem on changing Cobba, Cause I had "Contact Service" on almost three 3310. I first tried to flash the phone but still "Contact Service" then I have rehot Cobba from the top and replaced it. The same "Contact Service" on the display. I tried it with the other two 3310 and all the same again. Maybe, I am making a mistake, and I haven't seen anyone changing such IC's. Could anyone explain step by step on "How to Change Cobba, Flashing IC, UEM". Does it make any damage on heating the board at the bottom when changing the Cobba or any other. Hope to get more explanation on this.

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10-24-2004, 08:47	#2 (permalink)
pazeth™ No Life Poster Join Date: Jul 2004 Location: BANDA ACEH INDONESIA Posts: 1,268 Member: 74519 Status: Offline Thanks Meter: 79	to change IC BGA need skillfull and not just theory, try to find video repaire

10-24-2004, 08:48	#3 (permalink)
mtmc Freak Poster Join Date: Aug 2004 Location: www.Tools4Gsm.com Age: 46 Posts: 289 Member: 79725 Status: Offline Thanks Meter: 5	hi u have to apply some good flux on the ic u need to rehot then cirule heat the ic until you feel u can remove it ( but not remove just totch it from left to right so u see the ic move and return it self ) if this happen it mean u do a good reflow process p.n good flux = good reflow

10-24-2004, 17:39	#5 (permalink)
sumeda Freak Poster Join Date: Jul 2004 Age: 42 Posts: 154 Member: 71960 Status: Offline Thanks Meter: 5	Abdul971, my friend abdul you ask about how to replacing bga ic's but i'm not going to tell u how to replace them(read old posts). anyway in your contact service cases u din't mention what is the flasher you use to flash your phones. in nokia dct-3 phones like your 3310 contact service apear in six(6) types(according to old posts).one of them is when u switch on phone, phone on normal and insert sim card appear then contact servise show in display.this one can fix griffine,prodigy,etc....the other is directly contact service show in disply.most of times you cannot repair this trouble by using above mentioned flashers.to repair second one you have to use deajan or that kind of flasher.directly contact servise mean most of times corrupt data in eeprom area.damage imei,etc...so you have to write eeprom and rewrite imei ,update faid,to solve your problem. i tell you above deatails according to my knolege b'cos i repairing 10-20 contact servise phones per month but i occationally replce cobba or flash ic to remove contact servise problem. so abdul tell what kind of flasher u use to flash fist... good luck.

10-25-2004, 04:52	#6 (permalink)
Abdul971 Junior Member Join Date: Sep 2004 Age: 52 Posts: 15 Member: 84095 Status: Offline Thanks Meter: 0	When I power on the phone "Contact Service " appears. Actually I used Nokiaworkshop, and then tested with Eepromtool (there was a fail on Cobba Serial) Then used Nokiatool although IMEI was displayed. Then I realised there was a problem with Cobba and changed it. I know I making a mistake on replacing, that's why I need more explanation on replacing. If anyone has a pic please share it with us.

11-03-2004, 04:06	#7 (permalink)
daanish Freak Poster Join Date: Aug 2004 Location: The great pakistan Posts: 384 Member: 79823 Status: Offline Thanks Meter: 26	Abdul, sumeda is right but one mistake you are making is acording to my knolege is that you are not replaceing the ic properly when you change coba the fone must say insert sim and it should be locked (4locks) then unlock the fone with nokia tool 18 update FAID reset software and full fectory set and see if the fone works ok if no then flash your fone and do all the steps i mentioned above good luck wbr Daanish