I900 touch IC - GSM-Forum

kwaku85 · 01-20-2012, 10:03

I have problem with one I900. Touch is not working, but panel is ok. Touch filter is removed, but still nothing. Glue under ICs is ok too. Where is touch IC? Or is it managed directly from CPU?

efrcom · 01-21-2012, 14:24

Quote:

Originally Posted by kwaku85

I have problem with one I900. Touch is not working, but panel is ok. Touch filter is removed, but still nothing. Glue under ICs is ok too. Where is touch IC? Or is it managed directly from CPU?

1.touch connect
2.touch filter
3.touch capasitans
4.touch resist
5.touch ic
6.touch CPU

kwaku85 · 01-21-2012, 15:45

Good. I know that. I need to know where is I900 touch IC.

efrcom · 01-21-2012, 16:19

Quote:

Originally Posted by kwaku85

Good. I know that. I need to know where is I900 touch IC.

touch filter-UCLAMP0505A
touch ic-ESDALC6V1-5M6

kwaku85 · 01-21-2012, 16:42

Do You have schematic of this phone? I was try to found anything, but only service manual is possible to download.

I found Touch IC in lower-left side of PCB, near system connector. Signals from touch go to resistors, but is filtered with capacitors near this resistors, and (i think) by 2 ESD ICs. One near Touch connector, 2nd near Touch IC.

kwaku85 · 01-21-2012, 16:52

Quote:

Originally Posted by efrcom

touch filter-UCLAMP0505A
touch ic-ESDALC6V1-5M6

Thos two elements you type are only ESD protectors.

efrcom · 01-21-2012, 16:55

Quote:

Originally Posted by kwaku85

Do You have schematic of this phone? I was try to found anything, but only service manual is possible to download.

I found Touch IC in lower-left side of PCB, near system connector. Signals from touch go to resistors, but is filtered with capacitors near this resistors, and (i think) by 2 ESD ICs. One near Touch connector, 2nd near Touch IC.

yes
1.Service Schematics rev0.1
2.Service Manual

1.touch filter-0406-001208 parts code
2.touch ic -0406-001237 parts code

kwaku85 · 01-21-2012, 18:22

So, I still can't find godd schematic, but it looks like I can just remove this 2 ESD filters, and next try to change Touch IC.

Thanks for help

01-20-2012, 10:03	#1 (permalink)
kwaku85 No Life Poster Join Date: Jan 2006 Location: Poland Age: 39 Posts: 630 Member: 219917 Status: Offline Thanks Meter: 60	I900 touch IC I have problem with one I900. Touch is not working, but panel is ok. Touch filter is removed, but still nothing. Glue under ICs is ok too. Where is touch IC? Or is it managed directly from CPU?

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01-21-2012, 15:45	#3 (permalink)
kwaku85 No Life Poster Join Date: Jan 2006 Location: Poland Age: 39 Posts: 630 Member: 219917 Status: Offline Thanks Meter: 60	Good. I know that. I need to know where is I900 touch IC.

01-21-2012, 16:42	#5 (permalink)
kwaku85 No Life Poster Join Date: Jan 2006 Location: Poland Age: 39 Posts: 630 Member: 219917 Status: Offline Thanks Meter: 60	Do You have schematic of this phone? I was try to found anything, but only service manual is possible to download. I found Touch IC in lower-left side of PCB, near system connector. Signals from touch go to resistors, but is filtered with capacitors near this resistors, and (i think) by 2 ESD ICs. One near Touch connector, 2nd near Touch IC.

01-21-2012, 18:22	#8 (permalink)
kwaku85 No Life Poster Join Date: Jan 2006 Location: Poland Age: 39 Posts: 630 Member: 219917 Status: Offline Thanks Meter: 60	So, I still can't find godd schematic, but it looks like I can just remove this 2 ESD filters, and next try to change Touch IC. Thanks for help