Strange no network problem - GSM-Forum

Christopher · 04-14-2002, 10:55

I have a few set of Nokia phone with strange no network problem which i had just recently encounter as i had never meet it in the past. The problems are as follow:

1. Sometimes when power on the phone, network can be search automatically and very fast but sometime no network or very weak network with only 1-2 bars appear

2. So when there is no network on the phone, u can go to manuel search for network and all the networks will appear on the screen and just logged in it as though there is no fault in it.

3. But after a while of logged in to the network, there will be drop of network in a few minutes time which result in no network again.

Problem is that changing of cobba, hagger, rf, PA, ccont, CPU, upgrading n downgrading of software had been done. Majority of hardwares or I.C had been changed but the fault still occur. Sometimes it can work very well with network but sometime it do not have network. Pls help me as i had a few phones waiting for help. Thanks

neb · 04-14-2002, 11:40

If you mean nhm-5 and nhm-6, try to change C514 or C508 capacitors near HAGAR...

Christopher · 04-14-2002, 19:00

No, they are not nhm-5 or nhm-6. They are Nsm-3, Nsm-2 and Nsm-3D.

Hanukkah · 04-14-2002, 19:55

Try changing VCO, Crystal, and ant switch. Reflow caps and resistors below COBBA IC.

Jackmaxo · 04-15-2002, 02:06

Hi,
Our friend has tried all things, but not result.
He has all changer, COBBA, VCO, capacitors, upgrade.....
Here ther'is two things:
1- Mecanical problem with antena
2- Desoldred or cuted components
So
Make a full flash with a good one, test RF ke components, then rehot IC's and RF erea. Use Neelix to view RF statment.
Good luck.....i'am waiting for your...

04-14-2002, 10:55	#1 (permalink)
Christopher Junior Member Join Date: Apr 2002 Location: Singapore Age: 41 Posts: 4 Member: 10989 Status: Offline Thanks Meter: 0	Strange no network problem I have a few set of Nokia phone with strange no network problem which i had just recently encounter as i had never meet it in the past. The problems are as follow: 1. Sometimes when power on the phone, network can be search automatically and very fast but sometime no network or very weak network with only 1-2 bars appear 2. So when there is no network on the phone, u can go to manuel search for network and all the networks will appear on the screen and just logged in it as though there is no fault in it. 3. But after a while of logged in to the network, there will be drop of network in a few minutes time which result in no network again. Problem is that changing of cobba, hagger, rf, PA, ccont, CPU, upgrading n downgrading of software had been done. Majority of hardwares or I.C had been changed but the fault still occur. Sometimes it can work very well with network but sometime it do not have network. Pls help me as i had a few phones waiting for help. Thanks

04-14-2002, 11:40	#2 (permalink)
neb Freak Poster Join Date: Dec 1999 Location: Earth Posts: 461 Member: 751 Status: Offline Thanks Meter: 19	If you mean nhm-5 and nhm-6, try to change C514 or C508 capacitors near HAGAR... Last edited by neb; 04-14-2002 at 11:43.

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04-14-2002, 19:00	#3 (permalink)
Christopher Junior Member Join Date: Apr 2002 Location: Singapore Age: 41 Posts: 4 Member: 10989 Status: Offline Thanks Meter: 0	No, they are not nhm-5 or nhm-6. They are Nsm-3, Nsm-2 and Nsm-3D.

04-14-2002, 19:55	#4 (permalink)
Hanukkah No Life Poster Join Date: Jul 2001 Location: RP Age: 48 Posts: 890 Member: 5246 Status: Offline Thanks Meter: 9	Try changing VCO, Crystal, and ant switch. Reflow caps and resistors below COBBA IC.

04-15-2002, 02:06	#5 (permalink)
Jackmaxo Freak Poster Join Date: Dec 2001 Location: Earth Posts: 238 Member: 7934 Status: Offline Thanks Meter: 0	Hi, Our friend has tried all things, but not result. He has all changer, COBBA, VCO, capacitors, upgrade..... Here ther'is two things: 1- Mecanical problem with antena 2- Desoldred or cuted components So Make a full flash with a good one, test RF ke components, then rehot IC's and RF erea. Use Neelix to view RF statment. Good luck.....i'am waiting for your...