Motorola V3 call drop - GSM-Forum

thaonguyen · 03-13-2006, 05:08

With V3 phone, I am very difficult to repair " call drop " problem. A Call can drop after 10s, 20s... 90s. Sometimes, I try to flash by Sc ( file smf ) ok, sometimes to replace PA ok, sometimes to replace SAW or U150 ok . . .
But I don't underttand this problem exactly.
I have some experience, pls help me

Alkapone · 04-04-2006, 12:58

Problem is not in PA or somwhere else, if you look carefully it does like you close cover. So in fact problem is:

I phone working in perfect conditions, like it selected 19, 15 and etc chanels, and TX level not reaching 25-33 db all works ok, but if it selects in ex. 5 chanel, and powers it's PA to max level, your cover probe will think that cover is closed because PA's generating to strong signal, so it will drop call, and when PA activity ends, no distortion signal will receive probe, and it will think that cover is opened. So problem is in that circuit with cover probe, like in Samsung E530, Nokia 6170, because theese phones have same problems. Motorola claims that solution is latest firmware, but - sh.t, tryed, not working. In nokia helped some hardware modifications, in Samsung helped probe shielding. Will try some V3 to repair and will post solution if need'ed.

B.R.
Alkapone

webmoly · 04-14-2006, 16:42

did u fine any solution?

verse1965 · 04-14-2006, 18:01

Quote:

Originally Posted by thaonguyen

With V3 phone, I am very difficult to repair " call drop " problem. A Call can drop after 10s, 20s... 90s. Sometimes, I try to flash by Sc ( file smf ) ok, sometimes to replace PA ok, sometimes to replace SAW or U150 ok . . .
But I don't underttand this problem exactly.
I have some experience, pls help me

See here.....
http://forum.gsmhosting.com/vbb/show...20&postcount=3

Regards, JOHNNY.

Alkapone · 04-15-2006, 00:27

O, sorry, forgot ... Yes, solution found, and it is hall sensor faulty. You have to look at it, and if there is AA1 markings on it - faulty part (factory fault), you need to change it with 515808 (dont remember exact numbers, but just need to be not AA1), and that's all.

B.R.
Alkapone

03-13-2006, 05:08	#1 (permalink)
thaonguyen Junior Member Join Date: Mar 2004 Location: Viet Nam Age: 53 Posts: 18 Member: 59355 Status: Offline Thanks Meter: 0	Motorola V3 call drop With V3 phone, I am very difficult to repair " call drop " problem. A Call can drop after 10s, 20s... 90s. Sometimes, I try to flash by Sc ( file smf ) ok, sometimes to replace PA ok, sometimes to replace SAW or U150 ok . . . But I don't underttand this problem exactly. I have some experience, pls help me

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04-04-2006, 12:58	#2 (permalink)
Alkapone No Life Poster Join Date: Dec 2002 Location: Lithuania Age: 40 Posts: 1,189 Member: 19265 Status: Offline Thanks Meter: 92	Problem is not in PA or somwhere else, if you look carefully it does like you close cover. So in fact problem is: I phone working in perfect conditions, like it selected 19, 15 and etc chanels, and TX level not reaching 25-33 db all works ok, but if it selects in ex. 5 chanel, and powers it's PA to max level, your cover probe will think that cover is closed because PA's generating to strong signal, so it will drop call, and when PA activity ends, no distortion signal will receive probe, and it will think that cover is opened. So problem is in that circuit with cover probe, like in Samsung E530, Nokia 6170, because theese phones have same problems. Motorola claims that solution is latest firmware, but - sh.t, tryed, not working. In nokia helped some hardware modifications, in Samsung helped probe shielding. Will try some V3 to repair and will post solution if need'ed. B.R. Alkapone

04-14-2006, 16:42	#3 (permalink)
webmoly Freak Poster Join Date: May 2004 Location: Iran - Qum Age: 43 Posts: 449 Member: 66171 Status: Offline Thanks Meter: 6	did u fine any solution?

04-15-2006, 00:27	#5 (permalink)
Alkapone No Life Poster Join Date: Dec 2002 Location: Lithuania Age: 40 Posts: 1,189 Member: 19265 Status: Offline Thanks Meter: 92	O, sorry, forgot ... Yes, solution found, and it is hall sensor faulty. You have to look at it, and if there is AA1 markings on it - faulty part (factory fault), you need to change it with 515808 (dont remember exact numbers, but just need to be not AA1), and that's all. B.R. Alkapone