T28 No display - GSM-Forum

hs_ · 11-12-2002, 23:20

Ericsson T28
turn on phone after 2-3 seconds no display
I have changed all parts about display but problem is not solve
Any idea???

Best regarts

andie · 11-13-2002, 21:16

hi

have you try to flash new eeprom?

could be corrupted eeprom.

hope this can help

hs_ · 11-13-2002, 21:49

Thx,
I have flashed phone with latest version software...
and eeprom... But they didn't helpm me...
I thing phone has hardware problem...

wingsold · 11-14-2002, 01:33

hi
just heat up the audio ic or change it .

cemali34 · 11-15-2002, 08:42

you clean LCD Display pad.

cs55 · 11-15-2002, 20:30

change the e2p
then reflash it

Weller · 11-17-2002, 18:52

You must try to write eprom from the week of phone production, not with the latest version and than flash it. It worked in my case. You can see the year and week of production on the back of the phone.

kone · 11-18-2002, 20:25

If you have flashed the phone with diferent eeprom types
and display is still not working it must be hardware problem!!
The first idea is that there is broken lead of the first or last contact i cant remember try checking the lead if u have microscope or test it with resistance meter allways it happens near the pad where rubber from lcd is comeing

HEADMASTER · 11-19-2002, 00:14

T20 work fine but no speaker
heating up the audio ic in most case work 100%
But this one i have same case
turn on phone after 2-3 seconds no display

Skyfox · 11-19-2002, 08:31

This is 100% hardware problem. You did not have 6 V on LCD power pin. Try to resolder multimode and audio chips, if still no success, put you phone in to the trash can - you have damaged PCB or cpu.

hs_ · 11-19-2002, 22:30

Yes you right its %100 hardware problem I have rehot Audio IC and multimode IC but still doenst work
I have measured LCDV its some times ~2,4V some times max ~7.1V When is ~7.1V display is fully black...
May be PCB has be reason...
Its BIGGGGGG problem for me Because it's not my PHONE!!!!!

Thanks...
Best regarts...
notice **** ericsson!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!

samkis · 06-16-2003, 17:21

it's 100% multi-mode adaptor...

marple · 06-16-2003, 23:07

Change 1011120/4CR1A,same IC is for audio,mic and LCD,sometime when audio dont work and You press center of 5,6,8,9 key You hear the sound then try to heat him but not to much.

11-12-2002, 23:20	#1 (permalink)
hs_ Insane Poster Join Date: Oct 2002 Posts: 72 Member: 16859 Status: Offline Thanks Meter: 0	T28 No display Ericsson T28 turn on phone after 2-3 seconds no display I have changed all parts about display but problem is not solve Any idea??? Best regarts

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11-13-2002, 21:16	#2 (permalink)
andie Junior Member Join Date: Oct 2002 Posts: 31 Member: 16495 Status: Offline Thanks Meter: 0	hi have you try to flash new eeprom? could be corrupted eeprom. hope this can help

11-13-2002, 21:49	#3 (permalink)
hs_ Insane Poster Join Date: Oct 2002 Posts: 72 Member: 16859 Status: Offline Thanks Meter: 0	Thx, I have flashed phone with latest version software... and eeprom... But they didn't helpm me... I thing phone has hardware problem...

11-14-2002, 01:33	#4 (permalink)
wingsold Freak Poster Join Date: Apr 2002 Age: 50 Posts: 232 Member: 10736 Status: Offline Thanks Meter: 0	hi just heat up the audio ic or change it .

11-15-2002, 08:42	#5 (permalink)
cemali34 Insane Poster Join Date: Oct 2002 Location: Türkiye Age: 44 Posts: 76 Member: 17264 Status: Offline Thanks Meter: 0	you clean LCD Display pad.

11-15-2002, 20:30	#6 (permalink)
cs55 Freak Poster Join Date: Dec 2001 Location: clock wise Age: 48 Posts: 308 Member: 7845 Status: Offline Thanks Meter: 3	change the e2p then reflash it

11-17-2002, 18:52	#7 (permalink)
Weller Insane Poster Join Date: May 2001 Location: Zagreb Posts: 65 Member: 4526 Status: Offline Thanks Meter: 0	You must try to write eprom from the week of phone production, not with the latest version and than flash it. It worked in my case. You can see the year and week of production on the back of the phone.

11-18-2002, 20:25	#8 (permalink)
kone Freak Poster Join Date: Nov 2002 Location: Z3 Macedonia Skopje Age: 49 Posts: 144 Member: 17753 Status: Offline Thanks Meter: 0	If you have flashed the phone with diferent eeprom types and display is still not working it must be hardware problem!! The first idea is that there is broken lead of the first or last contact i cant remember try checking the lead if u have microscope or test it with resistance meter allways it happens near the pad where rubber from lcd is comeing

11-19-2002, 00:14	#9 (permalink)
HEADMASTER Freak Poster Join Date: Jun 2002 Location: TUNISIA Age: 62 Posts: 414 Member: 13122 Status: Offline Thanks Meter: 0	T20 work fine but no speaker heating up the audio ic in most case work 100% But this one i have same case turn on phone after 2-3 seconds no display

11-19-2002, 08:31	#10 (permalink)
Skyfox Insane Poster Join Date: Aug 2000 Location: Russia Age: 48 Posts: 96 Member: 1881 Status: Offline Thanks Meter: 1	This is 100% hardware problem. You did not have 6 V on LCD power pin. Try to resolder multimode and audio chips, if still no success, put you phone in to the trash can - you have damaged PCB or cpu.

11-19-2002, 22:30	#11 (permalink)
hs_ Insane Poster Join Date: Oct 2002 Posts: 72 Member: 16859 Status: Offline Thanks Meter: 0	Yes you right its %100 hardware problem I have rehot Audio IC and multimode IC but still doenst work I have measured LCDV its some times ~2,4V some times max ~7.1V When is ~7.1V display is fully black... May be PCB has be reason... Its BIGGGGGG problem for me Because it's not my PHONE!!!!! Thanks... Best regarts... notice **** ericsson!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!

06-16-2003, 17:21	#12 (permalink)
samkis Junior Member Join Date: Apr 2003 Posts: 6 Member: 26569 Status: Offline Thanks Meter: 0	it's 100% multi-mode adaptor...

06-16-2003, 23:07	#13 (permalink)
marple No Life Poster Join Date: Mar 2003 Location: Europe Age: 54 Posts: 788 Member: 24581 Status: Offline Thanks Meter: 87	Change 1011120/4CR1A,same IC is for audio,mic and LCD,sometime when audio dont work and You press center of 5,6,8,9 key You hear the sound then try to heat him but not to much.