T28 Power On Problem - GSM-Forum

HEADMASTER · 09-23-2002, 23:33

Have T28 with this problem
phone dont power on
I removed PA
I changed power on diode
I changed power on IC
I changed 13Mhz crystal
When i push power on button screen have little contrast
only this contrast
any help please

09-23-2002, 23:37

Can you write new eeprom ?

HEADMASTER · 09-23-2002, 23:43

Yes
I flashed it with atr53 and writed new eprom
same problem

Williamcwy · 09-24-2002, 04:37

How about try to remove backup battery. If still same problem, rehot DSP.

GOOD LUCK

HEADMASTER · 09-26-2002, 09:56

@WILLIAMCWY

SAME PROBLEM
THX FOR HELP

EGYGSM-TEAM · 09-27-2002, 07:04

Hi HEADMASTER
try to chang your eeprom then write new eeprom then flash the phone
goodluck
Wesam

Raheeeeb · 09-28-2002, 18:12

Quote:

Originally posted by wesam
Hi HEADMASTER
try to chang your eeprom then write new eeprom then flash the phone
goodluck
Wesam

i think in ericsson if the eeprom faulty we have indications like balnk dsp or no dsp in working screen it s read full adress and re write too ... so no problem in the eeprom it s the main power i c near the pf at the pf under left side around this i .c five big capsitor

09-23-2002, 23:33	#1 (permalink)
HEADMASTER Freak Poster Join Date: Jun 2002 Location: TUNISIA Age: 62 Posts: 414 Member: 13122 Status: Offline Thanks Meter: 0	T28 Power On Problem Have T28 with this problem phone dont power on I removed PA I changed power on diode I changed power on IC I changed 13Mhz crystal When i push power on button screen have little contrast only this contrast any help please

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09-23-2002, 23:37	#2 (permalink)
legija Guest Posts: n/a Member:	Can you write new eeprom ?

09-23-2002, 23:43	#3 (permalink)
HEADMASTER Freak Poster Join Date: Jun 2002 Location: TUNISIA Age: 62 Posts: 414 Member: 13122 Status: Offline Thanks Meter: 0	Yes I flashed it with atr53 and writed new eprom same problem

09-24-2002, 04:37	#4 (permalink)
Williamcwy Freak Poster Join Date: Jan 2002 Location: Malaysia Age: 47 Posts: 239 Member: 8898 Status: Offline Thanks Meter: 1	How about try to remove backup battery. If still same problem, rehot DSP. GOOD LUCK

09-26-2002, 09:56	#5 (permalink)
HEADMASTER Freak Poster Join Date: Jun 2002 Location: TUNISIA Age: 62 Posts: 414 Member: 13122 Status: Offline Thanks Meter: 0	@WILLIAMCWY SAME PROBLEM THX FOR HELP

09-27-2002, 07:04	#6 (permalink)
EGYGSM-TEAM Insane Poster Join Date: Jul 2002 Location: Egypt Age: 45 Posts: 98 Member: 14194 Status: Offline Thanks Meter: 4	Hi HEADMASTER try to chang your eeprom then write new eeprom then flash the phone goodluck Wesam