For new beginners. Nokia NO signal solutions

[Uvedovle]

HI:


I´d like to know a reliable way to know if network problems are from PA or antenna switch (without oscilator or any tool).


Thanks and regards

[GSM SNIPER]

Originally Posted by Uvedovle

HI:


I´d like to know a reliable way to know if network problems are from PA or antenna switch (without oscilator or any tool).


Thanks and regards

As I understand in First thread :

When the signal comes in the moment of power on and drops after minutes or seconds the problem is in 80% of cases PA (power Amplifier ).

and when It is absent at all In this mmement It can be duplexer (switch antenna) or Hagar in 80% of cases .

[keany]

all that i share here are for they that dont have a aparatures for test nokia like phoenix fps4 fps8 test frame for all nokia ,oschiloscope ,radiotester and others and without oscilator i cant say to you anythink.all that i share here are the experience when i test nokia and i see the really problems how they are .i dont know if you understand me .for me when come a nokia with a signal i test it with all aparatures and get a solution.

[keany]

you have understand well yes in most causes when the line drops after few sec is the pa.because this is a tx problem and the pa is only tx(trasmiter) but it must be cobba or dublexer because and they have tx too .all that i say here are in general (my experience)i hope that you understand me

[GSM SNIPER]

Originally Posted by keany

you have understand well yes in most causes when the line drops after few sec is the pa.because this is a tx problem and the pa is only tx(trasmiter) but it must be cobba or dublexer because and they have tx too .all that i say here are in general (my experience)i hope that you understand me

But the work that you have gave Is very important for both a begnners and Experiments men . Thank you very much ! and Viva ALBANIA !!

[spectrum]

Sometimes, you may have to manually select a network, if the service provider operates only single band, not dual band.
Because in dual band, the 900Mhz could be used for Transmit and a complimentary pair is used for Rx in 1800Mhz or the other way round.
Good thread though

[GSM SNIPER]

Originally Posted by spectrum

Sometimes, you may have to manually select a network, if the service provider operates only single band, not dual band.
Because in dual band, the 900Mhz could be used for Transmit and a complimentary pair is used for Rx in 1800Mhz or the other way round.
Good thread though

As the most and difficult prblem in nokia phones is signal pb .

I can vote 10000x for this thread because It helped me to bypass some some problems.thanks to Keany the ALBANIAN man !!!!

[spectrum]

For DCT3 phones, use the GO-NO GO software solution with Eeprom Tool, DCT3 Tester etc.
Pls note that the software will not solve your problems, but may point you in the right direction.
And in most cases, solutions to hardware problems can be found in:
https://forum.gsmhosting.com/vbb/f148/

[GSM SNIPER]

I used EEprom tools version 3 for only DCT3 and Eeprom tools 4 for both Dct3 and DCT4 .

do TEST selection !!! It is very good tool

[veeresh]

good job keep it up***********************

[Unggul]

You do not said the function of CPU, RAM ????
Is CPU Function Rx Or Tx ?????
I have try what you said man, but it's still not working.
I have N. 8250 No Signal, I'm checking the Voltage between CCONT and PA it's good, i change the new RF (Hagar IC's). it's still not good, I change all the part's what did you say before, it's still not good. i change the all component from the well phone.
But my experience last is, i changed the RAM Ic's the signal is good.
please answer my question above.
what is function CPU IC's in Signal ?
Why after i change the RAm the signal is good ?
thank's....
Anybody have the same experience with me, please quote!

[keany]

cpuuniversal central power)you must be too much expert to change it !!!!!!!! but if the signal is bad from cpu, i think that you phone is dead.
about ram i think that your signal was bad from ram and you have sucesfool done these.but you are fortunatly becouse your ram was not protected.and in 90% of 8210 and 8250 ram is protected and you have nothing to do.anyway i speak in generaly for ram and his parts in signal.because i see very well in my laborator when ram is bad in signal becouse the burst analysis tell the frequence too inormaly .
But these thread is for new begeners in nokia signal and i tell the parts of pa dublexer cobba hagar ,i can"t tell him to change cpu in the first 5 nokia experience .
i hope to begin a new thread for experts in nokia signal to discute a new problems in nokia signal,becouse is very important i think!
thanx for the question and good luck from

KEANY

[gabiz_ro]

@keany
cpu=universal central power
sorry if I made mistake but as I know cpu is something like central procesing unit thats the core of sistem and not universal central power for power in nokia is ccont as I know.

Another problem what I have is with 6310 that work ok on some area but in case if signal is low even if phone show 1,2 or 3 bars on signal loose conection on call.already changed PA and switch and don't have profesional rf tester.what can be the problem?

[leosedf]

This is something general and sometimes it works. however sometimes doesn't work at all. I prefer to use service manuals and equipment. That's what they are here for.
Don't go and change everything on the phone, find the fault first

[keany]

yes its sure that if you havent rf tester you must try to change everythink.you have change pa and switch and no resultat .you must try to change hagar now its the only easy solution now