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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Sony Ericsson > Sony Ericsson Hardware Repair

Sony Ericsson Hardware Repair Post here your Hardware Repairing Hints or Problems with SonyEricsson and Sony Phones.

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Old 09-19-2002, 02:03   #1 (permalink)
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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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Old 09-19-2002, 02:23   #2 (permalink)
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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
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Old 09-19-2002, 16:24   #3 (permalink)
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usual problem of dead t28 is shorted pa. Remove it.. and power to see.
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Old 09-19-2002, 21:25   #4 (permalink)
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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 ?
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Old 09-19-2002, 22:50   #5 (permalink)
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Hi,
Follow T28 service manual.
You can test charg/power points and outputs.
if not hel contact me
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Old 09-20-2002, 00:04   #6 (permalink)
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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?
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Old 09-20-2002, 16:57   #7 (permalink)
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@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.
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Old 09-20-2002, 21:37   #8 (permalink)
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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
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