t28 don't turn on!! - GSM-Forum

sergioems · 09-19-2002, 01:03

i've got where a t28 s that won't turn on. i put the charger in electric power suply and the led of charger turn on but when i conect charger to phone the charger led turn off. it's my first t28. what should i start to do? reply me . thanks

EGYGSM-TEAM · 09-19-2002, 01:23

Hi sergioems
of course after changing the battry follow that
1)by the avometer check the battry connector one on the right and the other on the left ? if you get short 00.00 then open the phone same as siemens clips and go to step 2 - if not then go to step A
2) the pa is the uper ic on the board on the left of it you will find a small black ressister remove it then power on the phone 100% will be power on
3)chang the pa and resold the resister again or jumper it and enjoy.
A) try to flash the phon with a bin eeprom then chang imei then flash the phone ***If not help then go to step B
B) open the phone and rehot or chang the power ic on the upper left on the board
please send to me what you do
goodluck
Wesam

Hanukkah · 09-19-2002, 15:24

usual problem of dead t28 is shorted pa. Remove it.. and power to see.

misel · 09-19-2002, 20:25

my good expirience can not give me answer for next question ,,,t28 dead ,,,when trie to power up ..phone consume more then 1.5 A current ,,, PA = OK ,, 101102 is OK ,,change new ,,also change new flash IC ,,also change RF processor ,,and nothing ,,when trie to flashing ,,,after 10-15 sec after erasing phone returned ERROR 03

and phone is still dead ,,zenner diode is also OK ,,down near connector,,

so ,,what can be ?

Jackmaxo · 09-19-2002, 21:50

Hi,
Follow T28 service manual.
You can test charg/power points and outputs.
if not hel contact me

sergioems · 09-19-2002, 23:04

H A N N U K A H
usual problem of dead t28 is shorted pa. Remove it.. and power to see.

tell me this ! after remove pa try to power and it will be on without puting still the pa?

Hanukkah · 09-20-2002, 15:57

@sergioems

Any phone will power on without PA! In the case of t28s, shorted PA is most widely known reason for not power on... because of faulty RM009 15p Power Amp. Replace it with 19p or better yet 21p series.

misel · 09-20-2002, 20:37

no peoples ,,,PA is not my problem this is first what i check ,,this is so simple to solve ,,also I change new power management IC C3R but nothing ,,then I change new RF IC with legs ,,and nothing ,,always phone consume 1.5 A when press power button ,,,and also I check pover on diode ,,everything looks OK ,,,but I think some is shorted in PCB ,,and can not be solved

09-19-2002, 01:03	#1 (permalink)
sergioems No Life Poster Join Date: Feb 2002 Location: Portugal- Center of Europe Age: 42 Posts: 1,244 Member: 9502 Status: Offline Thanks Meter: 9	t28 don't turn on!! i've got where a t28 s that won't turn on. i put the charger in electric power suply and the led of charger turn on but when i conect charger to phone the charger led turn off. it's my first t28. what should i start to do? reply me . thanks

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09-19-2002, 01:23	#2 (permalink)
EGYGSM-TEAM Insane Poster Join Date: Jul 2002 Location: Egypt Age: 45 Posts: 98 Member: 14194 Status: Offline Thanks Meter: 4	Hi sergioems of course after changing the battry follow that 1)by the avometer check the battry connector one on the right and the other on the left ? if you get short 00.00 then open the phone same as siemens clips and go to step 2 - if not then go to step A 2) the pa is the uper ic on the board on the left of it you will find a small black ressister remove it then power on the phone 100% will be power on 3)chang the pa and resold the resister again or jumper it and enjoy. A) try to flash the phon with a bin eeprom then chang imei then flash the phone ***If not help then go to step B B) open the phone and rehot or chang the power ic on the upper left on the board please send to me what you do goodluck Wesam

09-19-2002, 15:24	#3 (permalink)
Hanukkah No Life Poster Join Date: Jul 2001 Location: RP Age: 48 Posts: 890 Member: 5246 Status: Offline Thanks Meter: 9	usual problem of dead t28 is shorted pa. Remove it.. and power to see.

09-19-2002, 20:25	#4 (permalink)
misel No Life Poster Join Date: Apr 2000 Location: near you Age: 60 Posts: 560 Member: 1196 Status: Offline Thanks Meter: 6	my good expirience can not give me answer for next question ,,,t28 dead ,,,when trie to power up ..phone consume more then 1.5 A current ,,, PA = OK ,, 101102 is OK ,,change new ,,also change new flash IC ,,also change RF processor ,,and nothing ,,when trie to flashing ,,,after 10-15 sec after erasing phone returned ERROR 03 and phone is still dead ,,zenner diode is also OK ,,down near connector,, so ,,what can be ?

09-19-2002, 21:50	#5 (permalink)
Jackmaxo Freak Poster Join Date: Dec 2001 Location: Earth Posts: 238 Member: 7934 Status: Offline Thanks Meter: 0	Hi, Follow T28 service manual. You can test charg/power points and outputs. if not hel contact me

09-19-2002, 23:04	#6 (permalink)
sergioems No Life Poster Join Date: Feb 2002 Location: Portugal- Center of Europe Age: 42 Posts: 1,244 Member: 9502 Status: Offline Thanks Meter: 9	H A N N U K A H usual problem of dead t28 is shorted pa. Remove it.. and power to see. tell me this ! after remove pa try to power and it will be on without puting still the pa?

09-20-2002, 15:57	#7 (permalink)
Hanukkah No Life Poster Join Date: Jul 2001 Location: RP Age: 48 Posts: 890 Member: 5246 Status: Offline Thanks Meter: 9	@sergioems Any phone will power on without PA! In the case of t28s, shorted PA is most widely known reason for not power on... because of faulty RM009 15p Power Amp. Replace it with 19p or better yet 21p series.

09-20-2002, 20:37	#8 (permalink)
misel No Life Poster Join Date: Apr 2000 Location: near you Age: 60 Posts: 560 Member: 1196 Status: Offline Thanks Meter: 6	no peoples ,,,PA is not my problem this is first what i check ,,this is so simple to solve ,,also I change new power management IC C3R but nothing ,,then I change new RF IC with legs ,,and nothing ,,always phone consume 1.5 A when press power button ,,,and also I check pover on diode ,,everything looks OK ,,,but I think some is shorted in PCB ,,and can not be solved