nokia 8250 no reception

[unixyk]

hi. i need some help with my 8250. it has no reception (0 bars). it's not a software problem as I have done a fade check etc etc and tried several different 8250 flash files. when i do a manual network search it usually picks up 2 providers (not all of them). if i do the network search again it will pick up different providers every time. it also takes a while to do this. about a minute.

now my question is which chip should i reheat and is a 60w soldering iron good enough to do this. what else will i need. thanks a lot :).

[sergo_zmeia]

First U need hot air station...
than...read my guide in the main forum...there is all what U need to know..
Good luck!
sergo_zmeia

[unixyk]

i am prepared to get a hot air station. i have read your guide and found the ccont chip and the hager chip but i don't know where the cobol is. could you show me a diagram with the location of the cobol chip. thanx

[marky752000]

Looking at the phone, the Cobba is to the right of the Ccont, its the same size and at about the hight. both are below the Hager.

BR

Mark

[unixyk]

thanks a lot :). btw i picked up 2 cheap 8250's from ebay. one has a microphone problem and the other has a freezing problem.

i am not sure where exactly the microphone is located but i'm guessing it's at the bottom where there is a little gap between the front and the housing. look at the atached picture

as for the freezing of the other phone i'm pretty sure that thats a software problem and can probably be solved by a new flash. can anyone confirm this.

thanks a lot guys you've been a lot of help :D.

[sergo_zmeia]

About mic...yes is where U have marked on the picture...about freezing problem..2 solutions...
1.flash...
2.change 26Mhz clock..
Regards!
sergo_zmeia

[unixyk]

About mic...yes is where U have marked on the picture...about freezing problem..2 solutions...
1.flash...
2.change 26Mhz clock..
Regards!
sergo_zmeia

can you describe to me where exactly the 26mhz clock is? thanks.

[sergo_zmeia]

Put phone with elements to U...irda in Ur down right...
Now take a look on HAGAR...right from it ..U will see a metal thing with signature KYOCERA..thats the clock...
Regards!
sergo_zmeia

[unixyk]

thanks and for my last question. this one is about the nokia with no reception.

when the fone has a sim card inside and i try to call someone it gets a no network error however when it has no sim card inside and i try to call an emergency number it works fine. i can talk and hear and it only takes a few secconds to establish the connection. which chip should i be reheating?

[marky752000]

Well, firstly, using an emergency number to test a phone is not a very responsible thing to do.

Secondly I would try a sim card from a diffrent network, and see what happens,

[mvillara]

Try to see if the oscilator is alright. Asure that you get a perfect sine wave of an accurace of 26Mhz exactly using an osciloscope. If this signal is not perfect, no channel can not be fixed.