changed COBBA IC, but no signal - GSM-Forum

hooi76 · 05-20-2002, 21:11

changed COBBA IC, but no signal
i try to change the COBBA ic and then I calculate the Faid using Eeprom Tools 3.01, but i don't get signal! And the msid is 000001101001 (something like that)
Why

DrMobile · 05-20-2002, 21:40

if your MSID is like this 000001101001 u need to flash MCU+PPM to phone.. after that check... otherwise post in hardware repair section for better response.

Best Regards,
WaHaB

M@RTY · 05-21-2002, 02:16

Hi

If you changed your cobba , you will not get any signal until you re-calibrate ALL RF values with specialised test equipment.

B.R

M@RTY

Hope This Helps

Abe · 05-21-2002, 07:03

Not true.
You dont need any calibration......
Write mcu+ppm to phone and then calculate FAID...
if not work write new EEPROM (virgin if u have),change imei,calculatze faid and all ok.......

M@RTY · 05-21-2002, 08:16

COBBA stores RF A/D values

Change COBBA = CHANGED RF A/D values = SIGNAL PROBLEMS

Nokia Mobile Phones Service Bulletin No. SB-061/19.11.01
Technical Support, Europe & Africa

NSM-3

NEW COBBA VERSION (4370793)

Due to material availability new COBBA version has been released for NSM-3.

New COBBA (4370793) is backward compatible with previous COBBA version (4370643).

Old material in stock can be used, but new spare part orders must be placed to code 4370793.

Note: When COBBA is changed IMEI rebuild and RF tunings must be carried out.

CODE ITEM PG DESCRIPTION
Old 4370643 N250 35 COBBA_GJP V4.1 V257BG64T/8 BGA64
New 4370793 N250 35 COBBA_GJP V4.1 V257JG64T/8 BGA64

Abe · 05-21-2002, 08:26

So why i never had to calibrate rf when i changed cobba?
I only changed cobba,write new eeprom,change imei,flash mcu+ppm ,calc FAID....and all ok.....?

BufferMess · 05-21-2002, 15:58

M@RTY YOU ARE NOT RIGHT!!!

It does not matter which COBBA you put unless the type is the

same! OK! Maybe phone will not work as good as before, but it

will work without significant problem. The guy who can not get

tx power should write good eeprom and calculate imei & faid

programming data!

That`s it. No need to argue. Already tested by me on tenth of units!

Best Regards
BufferMess

hooi76 · 05-22-2002, 00:55

how bout 3310 NSM-5

M@RTY · 05-22-2002, 05:55

Quote:

Originally posted by Abe
So why i never had to calibrate rf when i changed cobba?
I only changed cobba,write new eeprom,change imei,flash mcu+ppm ,calc FAID....and all ok.....?

The answer is you took cobba from old pcb which would still have RF A/D values stored for that phone , no two phones have the same RF A/D values due to tolerences in components , the phone will never be 100% until RF is calibrated.

New pre-balled cobba i.c's are blank , thats why ALL nokia service material about changing cobba states RX/TX values must be re-aligned.

@ BufferMess

"That`s it. No need to argue. Already tested by me on tenth of units!"...............Who is argueing ? , i am only giving my advice.

B.R

M@RTY

hooi76 · 05-22-2002, 22:02

All of u are confusing me!!!
I've tried changing the 3310 (NSM-5) COBBA (which i didn't notice the type),
and it is still de same
I've done this:-
write MCU=200000-330000
write PPM=330000-3D0000
Write Virgin Eeprom=3D00000
Then i correct the IMEI, calculate the Faid, and reset the SP lock.
BUT i still don't get the SIGNAL!!!

DrMobile · 05-22-2002, 22:14

Quote:

Originally posted by hooi76
All of u are confusing me!!!
I've tried changing the 3310 (NSM-5) COBBA (which i didn't notice the type),
and it is still de same
I've done this:-
write MCU=200000-330000
write PPM=330000-3D0000
Write Virgin Eeprom=3D00000
Then i correct the IMEI, calculate the Faid, and reset the SP lock.
BUT i still don't get the SIGNAL!!!

Why u chnage cobba. Before changing Cobba network is working.. and one more question After changing Cobba u got totally no signals or signals for 5 seconds than no signals.

Best Regards,
WaHaB

hooi76 · 05-22-2002, 22:36

Change COBBA is because there's no ear volume sound can't hear other people talking(SPEAKER),
so have to change because already tried reflow but no success

masterross · 05-23-2002, 01:10

hi M@RTY,

where ca I find test and repair nokia equipment???
thanks

Quote:

Originally posted by M@RTY
Hi

If you changed your cobba , you will not get any signal until you re-calibrate ALL RF values with specialised test equipment.

B.R

M@RTY

Hope This Helps

BufferMess · 05-23-2002, 15:06

Nowhere! Nokia original GSM Tester is a huge collection of equipment which costs high enough to make us ------>>>>>>

M@RTY: OK! You were giving advice. Sorry for that! But you were insisting on your claim. Theoretically, you are right! However, don`t forget that we are conversating in GSM Forum not in Nokia Service Centres Meeting. Nobody here have such an equiplement nor such money to invest. RF values in the virgin eeprom are quite enough to run the phone without problems in any network.
It was tested hundred times by many people in this forum. Works perfectly!

hooi76: After changing COBBA msid will be like as you saw. Just write virgin eeprom and calculate necessary data. Don`t forget that new models of COBBA are backward compatible but older ones are NOT forward compatible!

Best Regards
BufferMess

Jackmaxo · 05-25-2002, 05:54

Hi,
All are correct, beacuse phone can show signal with our calibration but it's more better to calibrate it to have a good working phone.
Good luck

05-20-2002, 21:11	#1 (permalink)
hooi76 No Life Poster Join Date: Dec 2001 Location: In front of my computer Posts: 1,594 Member: 7741 Status: Offline Thanks Meter: 111	changed COBBA IC, but no signal changed COBBA IC, but no signal i try to change the COBBA ic and then I calculate the Faid using Eeprom Tools 3.01, but i don't get signal! And the msid is 000001101001 (something like that) Why

05-20-2002, 21:40	#2 (permalink)
DrMobile No Life Poster Join Date: Aug 2001 Location: P A K I S T A N _____________ Age: 40 Posts: 3,579 Member: 5932 Status: Offline Thanks Meter: 1,694	if your MSID is like this 000001101001 u need to flash MCU+PPM to phone.. after that check... otherwise post in hardware repair section for better response. Best Regards, WaHaB Last edited by DrMobile; 05-20-2002 at 21:43.

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05-21-2002, 02:16	#3 (permalink)
M@RTY Freak Poster Join Date: Feb 2002 Posts: 193 Member: 9254 Status: Offline Thanks Meter: 4	Hi If you changed your cobba , you will not get any signal until you re-calibrate ALL RF values with specialised test equipment. B.R M@RTY Hope This Helps

05-21-2002, 07:03	#4 (permalink)
Abe No Life Poster Join Date: Apr 2001 Location: Croatia Age: 45 Posts: 1,114 Member: 4185 Status: Offline Thanks Meter: 3	Not true. You dont need any calibration...... Write mcu+ppm to phone and then calculate FAID... if not work write new EEPROM (virgin if u have),change imei,calculatze faid and all ok.......

05-21-2002, 08:16	#5 (permalink)
M@RTY Freak Poster Join Date: Feb 2002 Posts: 193 Member: 9254 Status: Offline Thanks Meter: 4	COBBA stores RF A/D values Change COBBA = CHANGED RF A/D values = SIGNAL PROBLEMS Nokia Mobile Phones Service Bulletin No. SB-061/19.11.01 Technical Support, Europe & Africa NSM-3 NEW COBBA VERSION (4370793) Due to material availability new COBBA version has been released for NSM-3. New COBBA (4370793) is backward compatible with previous COBBA version (4370643). Old material in stock can be used, but new spare part orders must be placed to code 4370793. Note: When COBBA is changed IMEI rebuild and RF tunings must be carried out. CODE ITEM PG DESCRIPTION Old 4370643 N250 35 COBBA_GJP V4.1 V257BG64T/8 BGA64 New 4370793 N250 35 COBBA_GJP V4.1 V257JG64T/8 BGA64

05-21-2002, 08:26	#6 (permalink)
Abe No Life Poster Join Date: Apr 2001 Location: Croatia Age: 45 Posts: 1,114 Member: 4185 Status: Offline Thanks Meter: 3	So why i never had to calibrate rf when i changed cobba? I only changed cobba,write new eeprom,change imei,flash mcu+ppm ,calc FAID....and all ok.....?

05-21-2002, 15:58	#7 (permalink)
BufferMess No Life Poster Join Date: Mar 2002 Location: Karabakh - Azeris motherland Age: 45 Posts: 816 Member: 9856 Status: Offline Thanks Meter: 2	M@RTY YOU ARE NOT RIGHT!!! It does not matter which COBBA you put unless the type is the same! OK! Maybe phone will not work as good as before, but it will work without significant problem. The guy who can not get tx power should write good eeprom and calculate imei & faid programming data! That`s it. No need to argue. Already tested by me on tenth of units! Best Regards BufferMess

05-22-2002, 00:55	#8 (permalink)
hooi76 No Life Poster Join Date: Dec 2001 Location: In front of my computer Posts: 1,594 Member: 7741 Status: Offline Thanks Meter: 111	how bout 3310 NSM-5

05-22-2002, 22:02	#10 (permalink)
hooi76 No Life Poster Join Date: Dec 2001 Location: In front of my computer Posts: 1,594 Member: 7741 Status: Offline Thanks Meter: 111	All of u are confusing me!!! I've tried changing the 3310 (NSM-5) COBBA (which i didn't notice the type), and it is still de same I've done this:- write MCU=200000-330000 write PPM=330000-3D0000 Write Virgin Eeprom=3D00000 Then i correct the IMEI, calculate the Faid, and reset the SP lock. BUT i still don't get the SIGNAL!!!

05-22-2002, 22:36	#12 (permalink)
hooi76 No Life Poster Join Date: Dec 2001 Location: In front of my computer Posts: 1,594 Member: 7741 Status: Offline Thanks Meter: 111	Change COBBA is because there's no ear volume sound can't hear other people talking(SPEAKER), so have to change because already tried reflow but no success

05-23-2002, 15:06	#14 (permalink)
BufferMess No Life Poster Join Date: Mar 2002 Location: Karabakh - Azeris motherland Age: 45 Posts: 816 Member: 9856 Status: Offline Thanks Meter: 2	Nowhere! Nokia original GSM Tester is a huge collection of equipment which costs high enough to make us ------>>>>>> M@RTY: OK! You were giving advice. Sorry for that! But you were insisting on your claim. Theoretically, you are right! However, don`t forget that we are conversating in GSM Forum not in Nokia Service Centres Meeting. Nobody here have such an equiplement nor such money to invest. RF values in the virgin eeprom are quite enough to run the phone without problems in any network. It was tested hundred times by many people in this forum. Works perfectly! hooi76: After changing COBBA msid will be like as you saw. Just write virgin eeprom and calculate necessary data. Don`t forget that new models of COBBA are backward compatible but older ones are NOT forward compatible! Best Regards BufferMess

05-25-2002, 05:54	#15 (permalink)
Jackmaxo Freak Poster Join Date: Dec 2001 Location: Earth Posts: 238 Member: 7934 Status: Offline Thanks Meter: 0	Hi, All are correct, beacuse phone can show signal with our calibration but it's more better to calibrate it to have a good working phone. Good luck