3310 signals drops and comes back

[bre786]

I have some 3310 phones, which works ok but sometimes the signals drops and comes back emmediately. I replaced Duplexer, Cobba, Hagar, CCONT, PA, filters and full flashed too but still same problem.

Thanks in advance
bre786

[willy]

Bre786

try to check 26M TXCO pin of AFC
or replace it !


Willy

Originally posted by bre786
I have some 3310 phones, which works ok but sometimes the signals drops and comes back emmediately. I replaced Duplexer, Cobba, Hagar, CCONT, PA, filters and full flashed too but still same problem.

Thanks in advance
bre786

[gsmbun]

repair imei

[gsmbun]

you have eeprom tool (b pherks) reset imei and eeprom

[hooi76]

Hi willy,
Is that a crystal?

[willy]

Hooi76

It is G502, near L511 !

Willy

Originally posted by hooi76
Hi willy,
Is that a crystal?

[bre786]

@ Willy,

Thank for the help. I don,t have the phone with me now. When i receive agaiin will definately try.

br
bre786

[Mikimiao]

Believe me,, doing all of the trying is no use.... this is all happen with some of the 3310 board some of them, the board is the problem of else the ccont and hagar is the one how have bad solder underneath..... don do other thing,,,,, will not help...only thing u must do.... take out ccont and hagar if u like cobba as well...redo solder ball , make sure all of the ball make good and replace good(if u say don know how to make good later weill talk about it) make sure ( use good flux) check every of the cap and resistor around there is no lost and re**** with rework station...........Put back everything and try and see. if still not ok..... check every of the vtx vrx vsyn1,2 vref and etc..... if u realy want all of this long long time of work(: otherwise, there left one think all of the pple I know they will do is put a layer of thick tape upper ccont and put back all the thing screw and will press the ccont down to the pin and normally this tricks work all the time ....because this should be the board problem ,,,, this type of board will not stand longger heat time compare othere and will cause dammage underneath the bga pin thats why ...... hope this will help ....good luck!!

[willy]

HI Mikimiao,
Thanks for your experience ...

but,,, here,, i have some thing to state too !

i agree with you, if Hager does not have correct PLL loop, and CCONT does not supply working voltage , also PCB line cut or lost connect .

how about, COBBA, MCU, TCXO .VCO ??
COBBA handle TXC ( tx power level control) , and RX IP/QP , AFC
MCU ,, DSP , TXP, Hager control .......
TCXO for basic MCU running clock .max +- 200hz
VCO, RF/4 oscillogram for TX /RX

how about no TX by dead PA, also antenna switch ?????

do repair phone,, first,, we have to fine out "WHY" phone does not work,, where got wrong !

Thanks

Willy

Originally posted by Mikimiao
Believe me,,

doing all of the trying is no use ( not help)....
this is all happen with some of the 3310 board some of them,
the board is the problem

of else the ccont and hagar is the one how( it has) have bad solder underneath.....

don(do not) do other thing,,,,,(it ) will not help...
only thing u must do:
take out ccont and hagar ,
if u like cobba as well...re-do solder ball (reball cobba) , make sure all of the ball make good and replace good(returen in correct area on PCB) ,,

(if u say dont know how to make good (install chip) ,later we will talk about it)

make sure ( use good flux) check every of the cap. and resistor around there is , (do) no lost and re**** with rework station...........Put back everything and try and see. if still not ok..... (then)check every of the vtx vrx vsyn1,2 vref and etc.....


if u realy want,, all of this (it will take you ) long long time to work(:

otherwise, there left one thing , all of the people I know, they will do is put a layer of thick tape upper ccont and put back( with )all the thing screw , and (it) will press the ccont (go) down to the (PCB)pin ., and normally this tricks work all the time ....because this should be the board problem ,,,,

this type of board will not stand longger heat time compare othere and will cause dammage underneath the bga pin

thats why ...... hope this will help ....good luck!!

[Mikimiao]

Helo! willy..

I m fully agree with u. but no offence,,, this is not solving anything infact this add a lot of ?????? to this friend of us "bre786",,,, u r already talking engineer and design here ...........hope lucks go to every one!!

[willy]

HI Mikimiao,

like Phone has no TX , then, of casue, we need to know "WHY"

its not engineering only, it is proper way to solve problem...
you cannot treat cancer by just removing cancer.. you need to kill cancer : )

to test using equipment and find out where and reason why phone got not worked

not only try "LUCKY "

PS, special thanks for mate Lampin !

Willy

Originally posted by Mikimiao
Helo! willy..

I m fully agree with u. but no offence,,, this is not solving anything infact this add a lot of ?????? to this friend of us "bre786",,,, u r already talking engineer and design here ...........hope lucks go to every one!!

[Raheeeeb]

willly is right i solve many 6210 and 3310 by the way he explain ......he is make secrets availble to all ....