ReAL ExPeRtS help needed ... c55 powering off itself - GSM-Forum

**Brka** · 02-17-2004, 04:36

here's the thing ...

i received one c55 with this sympthom :
phone working ok ...
you play with it ... all ok
u put it on charger ... all ok
disconnect it from charger ..
put it alone ... no touching ..

phone lights goes off in fade ...
and ... from the speaker i hear short BZZZZ
and phone goes off ...

so ...

what i did :
- flashed new SW, full flash etc.
- flashed eeprom and SWUP after, repaired imei
still the same ...

hardware part ...
- changed 26Mhz oscillator
- changed Dialog IC
- canged RAM memory
- changed CPU

what else should I change ?
only one thing left ... Flash RAM ...

there is also one strange thing ...
when making a call ...
i can hear PA working bz-bz-bz ...
like when u put phone close to some radio ...
but call establishing and recieving work normally ..

when left without touching keypad ...
lights go off ... and phone after few secs.

so ...

anybody with some idea ?

maybe RF cpu in the middle part of phone is bad ...
or ...
better idea is that the power management system in phone is bad
but ... what controls it ?
everything is changed already and still the same ..

waiting for ideas

b.r.
Alexandar.

Abe · 02-17-2004, 05:39

Flash is still not changed. And some small capacitors.And mainboard........and lcd...... and mobile phone.......;-))

**sebagsm** · 02-17-2004, 12:38

I got one too with same problem... I repaired it with full flashing it to v21 ... there are some differences about hw and sw versions ... after that everything is ok ... and yes i rehoted the flash...

**Brka** · 02-21-2004, 15:21

i changed all possible ...
still the same

b.r.
Alexandar.

b0ba · 02-21-2004, 17:39

As for me, it's 32k crystal related...

WBR
b0ba

**Brka** · 02-24-2004, 14:24

HOLY COW !!!

this is real working solution ...
tnx a lot B0BA !!!

so ... i did a little analysis ...

phone starts up ...
you play with it ... and it dont check RTC state ...
and when you left it alone ....
power management do its job ... power off the display
and after that RTC state is checked ...
and reported as bad ... so the CPU itself swithc it off
because of hardware failure ..

heh ... little OS .... with interrupts ...

cool ...

this is really usefull thread

tnx again b0bA

b.r.
Alexandar.

**Brka** · 02-24-2004, 14:37

HOLY COW !!!

this is real working solution ...
tnx a lot B0BA !!!

so ... i did a little analysis ...

phone starts up ...
you play with it ... and it dont check RTC state ...
and when you left it alone ....
power management do its job ... power off the display
and after that RTC state is checked ...
and reported as bad ... so the CPU itself swithc it off
because of hardware failure ..

heh ... little OS .... with interrupts ...

cool ...

this is really usefull thread

tnx again b0bA

b.r.
Alexandar.

regmwesiga · 02-25-2004, 10:55

@b0ba

Where is 32K Crystal on PCB

Regards

Mwesiga

Quote:

Originally Posted by b0ba

As for me, it's 32k crystal related...

WBR
b0ba

**Brka** · 02-25-2004, 14:01

Lol :-)

u have the same problem ?

b.r.
Alexandar.

The Racer · 02-25-2004, 14:08

It's history man.Look here:
http://forum.gsmhosting.com/vbb/show...ght=c55+switch
"This is the story, exactly!
1.I flash/eeprom/log/map/load map it to V18(same flash ic hardware=software) and same problem!
2.I change RTC & without testing i reball Dialog IC. Now everything OK at 101%."

rustum · 07-05-2004, 15:12

Iam having a different problem with C55, by presing key 3 and 4 phone goes off,
i have replaced 32MHz crystal still not found ok same problem persists..

any solutions

Thanx

DeltaGSM · 07-05-2004, 17:18

Quote:

Originally Posted by rustum

Iam having a different problem with C55, by presing key 3 and 4 phone goes off,
i have replaced 32MHz crystal still not found ok same problem persists..

any solutions

Thanx

Change CPU, must work.

WBR

b0ba · 07-06-2004, 21:16

@rustum:
There is no 32Mhz (Mega Hertz) crystals in siemens phones.

PS: It is just BGA. Resolder ICs and be happy.

dghersin · 07-07-2004, 11:22

My EXPERIENCE: 90% Dialog IC, never CPU ,5% falsh. 5% no way to repair.

02-17-2004, 04:36	#1 (permalink)
Brka Moderator Join Date: Jun 1999 Location: Serbia Age: 48 Posts: 8,202 Member: 163 Status: Offline Thanks Meter: 7,778	ReAL ExPeRtS help needed ... c55 powering off itself here's the thing ... i received one c55 with this sympthom : phone working ok ... you play with it ... all ok u put it on charger ... all ok disconnect it from charger .. put it alone ... no touching .. phone lights goes off in fade ... and ... from the speaker i hear short BZZZZ and phone goes off ... so ... what i did : - flashed new SW, full flash etc. - flashed eeprom and SWUP after, repaired imei still the same ... hardware part ... - changed 26Mhz oscillator - changed Dialog IC - canged RAM memory - changed CPU what else should I change ? only one thing left ... Flash RAM ... there is also one strange thing ... when making a call ... i can hear PA working bz-bz-bz ... like when u put phone close to some radio ... but call establishing and recieving work normally .. when left without touching keypad ... lights go off ... and phone after few secs. so ... anybody with some idea ? maybe RF cpu in the middle part of phone is bad ... or ... better idea is that the power management system in phone is bad but ... what controls it ? everything is changed already and still the same .. waiting for ideas b.r. Alexandar.

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02-17-2004, 05:39	#2 (permalink)
Abe No Life Poster Join Date: Apr 2001 Location: Croatia Age: 45 Posts: 1,114 Member: 4185 Status: Offline Thanks Meter: 3	Flash is still not changed. And some small capacitors.And mainboard........and lcd...... and mobile phone.......;-))

02-17-2004, 12:38	#3 (permalink)
sebagsm Moderator Join Date: Sep 2002 Location: Serbia/Hungary Age: 42 Posts: 1,043 Member: 15994 Status: Offline Thanks Meter: 263	I got one too with same problem... I repaired it with full flashing it to v21 ... there are some differences about hw and sw versions ... after that everything is ok ... and yes i rehoted the flash...

02-21-2004, 15:21	#4 (permalink)
Brka Moderator Join Date: Jun 1999 Location: Serbia Age: 48 Posts: 8,202 Member: 163 Status: Offline Thanks Meter: 7,778	i changed all possible ... still the same b.r. Alexandar.

02-21-2004, 17:39	#5 (permalink)
b0ba No Life Poster Join Date: Oct 2001 Location: No route to host. Age: 43 Posts: 895 Member: 6772 Status: Offline Thanks Meter: 17	As for me, it's 32k crystal related... WBR b0ba

02-24-2004, 14:24	#6 (permalink)
Brka Moderator Join Date: Jun 1999 Location: Serbia Age: 48 Posts: 8,202 Member: 163 Status: Offline Thanks Meter: 7,778	HOLY COW !!! this is real working solution ... tnx a lot B0BA !!! so ... i did a little analysis ... phone starts up ... you play with it ... and it dont check RTC state ... and when you left it alone .... power management do its job ... power off the display and after that RTC state is checked ... and reported as bad ... so the CPU itself swithc it off because of hardware failure .. heh ... little OS .... with interrupts ... cool ... this is really usefull thread tnx again b0bA b.r. Alexandar.

02-24-2004, 14:37	#7 (permalink)
Brka Moderator Join Date: Jun 1999 Location: Serbia Age: 48 Posts: 8,202 Member: 163 Status: Offline Thanks Meter: 7,778	HOLY COW !!! this is real working solution ... tnx a lot B0BA !!! so ... i did a little analysis ... phone starts up ... you play with it ... and it dont check RTC state ... and when you left it alone .... power management do its job ... power off the display and after that RTC state is checked ... and reported as bad ... so the CPU itself swithc it off because of hardware failure .. heh ... little OS .... with interrupts ... cool ... this is really usefull thread tnx again b0bA b.r. Alexandar.

02-25-2004, 14:01	#9 (permalink)
Brka Moderator Join Date: Jun 1999 Location: Serbia Age: 48 Posts: 8,202 Member: 163 Status: Offline Thanks Meter: 7,778	Lol :-) u have the same problem ? b.r. Alexandar.

02-25-2004, 14:08	#10 (permalink)
The Racer Freak Poster Join Date: Jan 2003 Location: SL 550 Age: 48 Posts: 467 Member: 20490 Status: Offline Thanks Meter: 3	It's history man.Look here: http://forum.gsmhosting.com/vbb/show...ght=c55+switch "This is the story, exactly! 1.I flash/eeprom/log/map/load map it to V18(same flash ic hardware=software) and same problem! 2.I change RTC & without testing i reball Dialog IC. Now everything OK at 101%."

07-05-2004, 15:12	#11 (permalink)
rustum Junior Member Join Date: Jun 2004 Age: 45 Posts: 30 Member: 70391 Status: Offline Thanks Meter: 0	Iam having a different problem with C55, by presing key 3 and 4 phone goes off, i have replaced 32MHz crystal still not found ok same problem persists.. any solutions Thanx

07-06-2004, 21:16	#13 (permalink)
b0ba No Life Poster Join Date: Oct 2001 Location: No route to host. Age: 43 Posts: 895 Member: 6772 Status: Offline Thanks Meter: 17	@rustum: There is no 32Mhz (Mega Hertz) crystals in siemens phones. PS: It is just BGA. Resolder ICs and be happy.

07-07-2004, 11:22	#14 (permalink)
dghersin Freak Poster Join Date: Dec 2000 Location: Croatia Posts: 225 Member: 2765 Status: Offline Thanks Meter: 12	My EXPERIENCE: 90% Dialog IC, never CPU ,5% falsh. 5% no way to repair.