3310 witch cobba ID 00000. how to repair?? - GSM-Forum

Gsmtronix · 03-21-2002, 07:17

It came with the 4 locks closed, I opened them like you all already know...
I didn't realise before fixing it, but now it has cobba id 00000 in nk_calc and eeprom tools. The phone never finds network.

Is it software or hardware problem? How to fix it?

Regards,
Mike

Allen · 03-21-2002, 14:59

I have come up with this kind of problem,

COBBA say on nk_calc 000000, i tried dBugs solution and worked fine but still i have to watch for it 3 to 5 days from now.

Simply take off cobba chip clean connections and take back... hope this help yours.

REGards!

koax · 03-21-2002, 18:17

Is it possible to take off the cobba chip without damageing it ?
Or hot air gun needed?

BufferMess · 03-21-2002, 22:36

Hi

A usual COBBA problem! It is possible to rehot COBBA without damaging it. Needed hotair gun and good hands.

Good Luck
BufferMess

neb · 03-22-2002, 00:16

Cobba ID: 00000

Apply some flux and rehot cobba chip.......fails?

Desolder cobba chip, reball, clean pcb, and resolder back the chip........still fails?

Install new chip and run nk_calc. That's it.

Br,

tra0416 · 03-22-2002, 08:38

Tried once and it was succesful.
thanks

ömer · 03-23-2002, 05:50

......if cobba circuit covered silicon
how can i remove it ?

Gsmtronix · 03-24-2002, 00:37

Thanks people for replying

Where's located cobba exactly?

Airwaves · 03-26-2002, 00:52

What is dBugs solution? A link someone please?

Gsmtronix · 03-26-2002, 08:22

Nobody knows where's cobba located? impressive...
Atleast, what's the component's code, I search in service manual...

BufferMess · 03-27-2002, 16:19

Of course nobody will know that! Some people here have never seen
open PCB with his own eyes. 3310 COBBA is located above the flash chip that you should definitely see at the bottom of scheme.
On newer versions it is underfilled so no cure!!!

BufferMess

fofodaman · 03-28-2002, 17:55

with cobba ID 00000, you can soimetimes get it to work, the problem you will face is, this ID is generated cause the cobba is misreporting itself, & that is usually cause one of the connectors under it is cracked or is a bad connection, so when pressing the keys on the phone, sometimes you will cause the cobba to act normally & report it's true ID, so you will lose the network & have to recalculate, reheating should make it work,

i have not yet seen an underfilled cobba, & if they do exist, then i would say this is a cure from nokia themselves to solve the contact service problem, i verymuch doubt seeing an underfilled cobba with cobba ID 00000.

BufferMess · 03-29-2002, 16:37

Hi

Yes I agree with you that COBBA can be either damaged or connectors under it cracked. But underfilled COBBA are in use long time ago. It is not visible as in MAD2. When looking at COBBA you don`t see it but after removing COBBA most of the times it is mostly impossible to replace it back. Even in official Nokia manuals it is abbreviated with the words like "unchangable" or "irrepairable". Unfortunately, I don`t know from which hardware versions Nokia started to apply these.

Before a machine called "BGA Soldering Machine" can resolder and replace all the chips (except MAD2) on the Nokia PCB. But now, this machine is almost powerless. There is an underfilling material which tightly subpresses chip and plate to each other, creating a vacuum within them. Because of this vacuum, solderings under the chip form special shape by which they perfectly stick to the conduction points (called as balls, but originally there is no such a ball, they are created when you remove the chip) on the PCB. Taking the chip will cause the vacuum to disappear and you can never create it again. Unfortunately, this is a fact!

In this case, only slight reflowing of COBBA can help us! If it is not underfilled, you can replace it as well

BufferMess

hanoon · 04-02-2002, 10:21

100% hardware problem.......rehot COBBA with good liquid flux and in most cases it will be okay and if this not help u must install new ic then calculate and update EEprom area....

good luck!

hanoon©

03-21-2002, 07:17	#1 (permalink)
Gsmtronix Insane Poster Join Date: Mar 2002 Posts: 76 Member: 10171 Status: Offline Thanks Meter: 1	3310 witch cobba ID 00000. how to repair?? It came with the 4 locks closed, I opened them like you all already know... I didn't realise before fixing it, but now it has cobba id 00000 in nk_calc and eeprom tools. The phone never finds network. Is it software or hardware problem? How to fix it? Regards, Mike

03-21-2002, 18:17	#3 (permalink)
koax Freak Poster Join Date: Jun 2001 Location: Hungary-Russia Age: 46 Posts: 189 Member: 4894 Status: Offline Thanks Meter: 0	Is it possible to take off the cobba chip without demageing it ? Is it possible to take off the cobba chip without damageing it ? Or hot air gun needed?

03-22-2002, 00:16	#5 (permalink)
neb Freak Poster Join Date: Dec 1999 Location: Earth Posts: 461 Member: 751 Status: Offline Thanks Meter: 19	Cobba ID: 00000 Apply some flux and rehot cobba chip.......fails? Desolder cobba chip, reball, clean pcb, and resolder back the chip........still fails? Install new chip and run nk_calc. That's it. Br, Last edited by neb; 03-22-2002 at 00:18.

03-29-2002, 16:37	#13 (permalink)
BufferMess No Life Poster Join Date: Mar 2002 Location: Karabakh - Azeris motherland Age: 45 Posts: 816 Member: 9856 Status: Offline Thanks Meter: 2	Hi Yes I agree with you that COBBA can be either damaged or connectors under it cracked. But underfilled COBBA are in use long time ago. It is not visible as in MAD2. When looking at COBBA you don`t see it but after removing COBBA most of the times it is mostly impossible to replace it back. Even in official Nokia manuals it is abbreviated with the words like "unchangable" or "irrepairable". Unfortunately, I don`t know from which hardware versions Nokia started to apply these. Before a machine called "BGA Soldering Machine" can resolder and replace all the chips (except MAD2) on the Nokia PCB. But now, this machine is almost powerless. There is an underfilling material which tightly subpresses chip and plate to each other, creating a vacuum within them. Because of this vacuum, solderings under the chip form special shape by which they perfectly stick to the conduction points (called as balls, but originally there is no such a ball, they are created when you remove the chip) on the PCB. Taking the chip will cause the vacuum to disappear and you can never create it again. Unfortunately, this is a fact! In this case, only slight reflowing of COBBA can help us! If it is not underfilled, you can replace it as well BufferMess Last edited by BufferMess; 03-29-2002 at 19:59.

04-02-2002, 10:21	#14 (permalink)
hanoon No Life Poster Join Date: Dec 2001 Location: USA Age: 45 Posts: 596 Member: 8051 Status: Offline Thanks Meter: 6	hanoon© 100% hardware problem.......rehot COBBA with good liquid flux and in most cases it will be okay and if this not help u must install new ic then calculate and update EEprom area.... good luck! hanoon©

03-21-2002, 14:59	#2 (permalink)
Allen No Life Poster Join Date: Sep 2000 Location: Philippines Posts: 521 Member: 2034 Status: Offline Thanks Meter: 24	I have come up with this kind of problem, COBBA say on nk_calc 000000, i tried dBugs solution and worked fine but still i have to watch for it 3 to 5 days from now. Simply take off cobba chip clean connections and take back... hope this help yours. REGards!

03-21-2002, 22:36	#4 (permalink)
BufferMess No Life Poster Join Date: Mar 2002 Location: Karabakh - Azeris motherland Age: 45 Posts: 816 Member: 9856 Status: Offline Thanks Meter: 2	Hi A usual COBBA problem! It is possible to rehot COBBA without damaging it. Needed hotair gun and good hands. Good Luck BufferMess

03-22-2002, 08:38	#6 (permalink)
tra0416 Insane Poster Join Date: Sep 2001 Location: Philippines Posts: 79 Member: 6460 Status: Offline Thanks Meter: 1	Tried once and it was succesful. thanks

03-23-2002, 05:50	#7 (permalink)
ömer Insane Poster Join Date: Apr 2001 Location: TURKEY Age: 55 Posts: 85 Member: 4331 Status: Offline Thanks Meter: 0	......if cobba circuit covered silicon how can i remove it ?

03-24-2002, 00:37	#8 (permalink)
Gsmtronix Insane Poster Join Date: Mar 2002 Posts: 76 Member: 10171 Status: Offline Thanks Meter: 1	Thanks people for replying Where's located cobba exactly?

03-26-2002, 00:52	#9 (permalink)
Airwaves Junior Member Join Date: Mar 2002 Posts: 12 Member: 10439 Status: Offline Thanks Meter: 0	What is dBugs solution? A link someone please?

03-26-2002, 08:22	#10 (permalink)
Gsmtronix Insane Poster Join Date: Mar 2002 Posts: 76 Member: 10171 Status: Offline Thanks Meter: 1	Nobody knows where's cobba located? impressive... Atleast, what's the component's code, I search in service manual...

03-27-2002, 16:19	#11 (permalink)
BufferMess No Life Poster Join Date: Mar 2002 Location: Karabakh - Azeris motherland Age: 45 Posts: 816 Member: 9856 Status: Offline Thanks Meter: 2	Of course nobody will know that! Some people here have never seen open PCB with his own eyes. 3310 COBBA is located above the flash chip that you should definitely see at the bottom of scheme. On newer versions it is underfilled so no cure!!! BufferMess

03-28-2002, 17:55	#12 (permalink)
fofodaman Freak Poster Join Date: Jan 2002 Location: Leon Posts: 461 Member: 8804 Status: Offline Thanks Meter: 4	with cobba ID 00000, you can soimetimes get it to work, the problem you will face is, this ID is generated cause the cobba is misreporting itself, & that is usually cause one of the connectors under it is cracked or is a bad connection, so when pressing the keys on the phone, sometimes you will cause the cobba to act normally & report it's true ID, so you will lose the network & have to recalculate, reheating should make it work, i have not yet seen an underfilled cobba, & if they do exist, then i would say this is a cure from nokia themselves to solve the contact service problem, i verymuch doubt seeing an underfilled cobba with cobba ID 00000.

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