A400 Call Ended - Nothing helps... - GSM-Forum

FractalizeR · 02-14-2004, 12:31

Hello!
I have strange A400 with full network, but always Call Ended even to 112 call. We tried all possible: call without antenna - still the same, change PA, write EEPROM from another phone on ****, unlocking, resetting E2P, changing back cover to another one from working..... Everything.....
Any ideas?

alex-andro · 02-14-2004, 12:38

hm...strange... PA - working?

FractalizeR · 02-14-2004, 12:41

Yes, it is.

alex-andro · 02-14-2004, 12:54

change,....reflow dsp !

debeliamark · 02-15-2004, 08:57

You can try to decrease TX signal to PA to prevent from overloading

FractalizeR · 02-17-2004, 10:26

Quote:

Originally Posted by debeliamark

You can try to decrease TX signal to PA to prevent from overloading

We already changed DSP - no effect. How to descrease TX signal? WinIMEI? Or ToolBox?

debeliamark · 02-18-2004, 06:41

Catch me on ICQ

TOZE · 02-24-2004, 14:02

i have this problem on a A 400 too

can we solve this problem

Thanks

Elco · 02-24-2004, 17:42

yes.Remove antenna conector from board.Phone will make call.

On this phones its antena impedance problem.Some phone work only without antenna,ather only without antenna & antenna screw from back cover.In both cases antenna or even antenna screw have too big compsumtion from rf power.So phone enter in rf autooscilation & local osc its blocking.

In this situation u must isolate antenna connector from board from antenna screw from back cover.Rf connection still makes(capacitor principes)antenna conector will be close to antenna screw so work like a low value capacitor.Phone will still have signal & PHONW WILL MAKE CALL.

TOZE · 02-25-2004, 00:08

thank you for your very interresting answer
i will try
thanks you

proxy_gsm · 02-25-2004, 08:55

replace the an****a switch,out door an****a & resoilder this area then clean the hole pcb,this is tested by me 100% result,if it is not done for you then it would be pcb fault.post the result.

Thank you.

TOZE · 02-25-2004, 17:26

i have test without antenna buit the connection while a conversation is very bad so i will test the second solution

i think this is a ******* fone

thanks for the reply

Burim · 02-25-2004, 18:52

I have this probleme with A400 but all metod i see ,nothing has not suksesfull
have you got eni metod
thanks

Elco · 02-25-2004, 19:31

Quote:

Originally Posted by Burim

I have this probleme with A400 but all metod i see ,nothing has not suksesfull
have you got eni metod
thanks

yes change the PA

abdoulaye · 02-25-2004, 19:57

contact me for the solution

02-14-2004, 12:31	#1 (permalink)
FractalizeR No Life Poster Join Date: Nov 2002 Location: Russia Age: 42 Posts: 1,317 Member: 17711 Status: Offline Thanks Meter: 1,858	A400 Call Ended - Nothing helps... Hello! I have strange A400 with full network, but always Call Ended even to 112 call. We tried all possible: call without antenna - still the same, change PA, write EEPROM from another phone on ****, unlocking, resetting E2P, changing back cover to another one from working..... Everything..... Any ideas?

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02-14-2004, 12:38	#2 (permalink)
alex-andro Freak Poster Join Date: Sep 2003 Location: Russia Posts: 259 Member: 40390 Status: Offline Thanks Meter: 0	hm...strange... PA - working?

02-14-2004, 12:41	#3 (permalink)
FractalizeR No Life Poster Join Date: Nov 2002 Location: Russia Age: 42 Posts: 1,317 Member: 17711 Status: Offline Thanks Meter: 1,858	Yes, it is.

02-14-2004, 12:54	#4 (permalink)
alex-andro Freak Poster Join Date: Sep 2003 Location: Russia Posts: 259 Member: 40390 Status: Offline Thanks Meter: 0	change,....reflow dsp !

02-15-2004, 08:57	#5 (permalink)
debeliamark No Life Poster Join Date: May 2001 Location: Bulgaria Age: 56 Posts: 4,796 Member: 4627 Status: Offline Sonork: 57528:debeliamark Thanks Meter: 1,034	You can try to decrease TX signal to PA to prevent from overloading

02-18-2004, 06:41	#7 (permalink)
debeliamark No Life Poster Join Date: May 2001 Location: Bulgaria Age: 56 Posts: 4,796 Member: 4627 Status: Offline Sonork: 57528:debeliamark Thanks Meter: 1,034	Catch me on ICQ

02-24-2004, 14:02	#8 (permalink)
TOZE No Life Poster Join Date: Feb 2004 Location: GSM-CLINIQUE.COM, SOUTH COAST Age: 43 Posts: 708 Member: 54945 Status: Offline Thanks Meter: 22	i have this problem on a A 400 too can we solve this problem Thanks

02-24-2004, 17:42	#9 (permalink)
Elco No Life Poster Join Date: Dec 2002 Location: Romania Posts: 10,018 Member: 19254 Status: Offline Sonork: 100.72990 Thanks Meter: 25,395	yes.Remove antenna conector from board.Phone will make call. On this phones its antena impedance problem.Some phone work only without antenna,ather only without antenna & antenna screw from back cover.In both cases antenna or even antenna screw have too big compsumtion from rf power.So phone enter in rf autooscilation & local osc its blocking. In this situation u must isolate antenna connector from board from antenna screw from back cover.Rf connection still makes(capacitor principes)antenna conector will be close to antenna screw so work like a low value capacitor.Phone will still have signal & PHONW WILL MAKE CALL.

02-25-2004, 00:08	#10 (permalink)
TOZE No Life Poster Join Date: Feb 2004 Location: GSM-CLINIQUE.COM, SOUTH COAST Age: 43 Posts: 708 Member: 54945 Status: Offline Thanks Meter: 22	thank you for your very interresting answer i will try thanks you

02-25-2004, 08:55	#11 (permalink)
proxy_gsm No Life Poster Join Date: Aug 2003 Location: Bangladesh Posts: 1,409 Member: 37349 Status: Offline Sonork: 100.1613413 Thanks Meter: 362	replace the an**a switch,out door an**a & resoilder this area then clean the hole pcb,this is tested by me 100% result,if it is not done for you then it would be pcb fault.post the result. Thank you.

02-25-2004, 17:26	#12 (permalink)
TOZE No Life Poster Join Date: Feb 2004 Location: GSM-CLINIQUE.COM, SOUTH COAST Age: 43 Posts: 708 Member: 54945 Status: Offline Thanks Meter: 22	i have test without antenna buit the connection while a conversation is very bad so i will test the second solution i think this is a ******* fone thanks for the reply

02-25-2004, 18:52	#13 (permalink)
Burim Insane Poster Join Date: Mar 2003 Location: kosovo Posts: 76 Member: 24657 Status: Offline Thanks Meter: 2	I have this probleme with A400 but all metod i see ,nothing has not suksesfull have you got eni metod thanks

02-25-2004, 19:57	#15 (permalink)
abdoulaye No Life Poster Join Date: Oct 2003 Location: senegal (dakar)mali/guinee/mauritanie[KANDJI ET FRERES] Age: 42 Posts: 1,057 Member: 41375 Status: Offline Thanks Meter: 7	contact me for the solution