key pad not working sgh n191 samsung - GSM-Forum

singapore · 07-07-2005, 07:52

I have the samsung sch n191 cdma mobile the phone is okay the problem is that key pad is not working even after cleaning the contacts and the pcb
what could be the problem

Zaihtam · 07-07-2005, 16:42

the keypad is interfaced to Quallcomm chip, but there should be some de bounce buffer or filter (before interfaced) to MSMXXXXX chip. check the wire from pad to the msm. if the line and de bounce circuit are good you should change the MSMXXXX, i think..

good luck...

arshil_teli · 08-05-2005, 12:50

check out the side switches bro it will work 100 %

prmzin · 08-05-2005, 21:59

u need to change a small six legpart on leftside bottom of pcb front side . i will upload a photograph tommorow.

prmzin · 08-07-2005, 20:58

just change this part from a working hanset 100% confirm fault.

prince_raj_gsm · 08-12-2005, 10:34

Check out above mentioned side keys of volume ,and remove two capacitor between these two keys. its always work .

Spacewalker · 08-12-2005, 12:04

I have some problem with X450 . remove all capacitor, and other element - not weork. REMOVE Microfon - and WORK. change to good - and phone work

07-07-2005, 07:52	#1 (permalink)
singapore Insane Poster Join Date: Oct 2004 Location: bhopal Age: 51 Posts: 80 Member: 85008 Status: Offline Thanks Meter: 4	key pad not working sgh n191 samsung I have the samsung sch n191 cdma mobile the phone is okay the problem is that key pad is not working even after cleaning the contacts and the pcb what could be the problem

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07-07-2005, 16:42	#2 (permalink)
Zaihtam No Life Poster Join Date: Dec 2004 Location: 0x001FD00 Posts: 1,285 Member: 98572 Status: Offline Thanks Meter: 36	the keypad is interfaced to Quallcomm chip, but there should be some de bounce buffer or filter (before interfaced) to MSMXXXXX chip. check the wire from pad to the msm. if the line and de bounce circuit are good you should change the MSMXXXX, i think.. good luck...

08-05-2005, 12:50	#3 (permalink)
arshil_teli Insane Poster Join Date: Jan 2003 Posts: 96 Member: 19726 Status: Offline Thanks Meter: 18	check out the side switches bro it will work 100 %

08-05-2005, 21:59	#4 (permalink)
prmzin Freak Poster Join Date: Feb 2004 Age: 45 Posts: 165 Member: 54900 Status: Offline Thanks Meter: 11	u need to change a small six legpart on leftside bottom of pcb front side . i will upload a photograph tommorow.

08-12-2005, 10:34	#6 (permalink)
prince_raj_gsm Freak Poster Join Date: Nov 2002 Location: India Age: 47 Posts: 127 Member: 17623 Status: Offline Thanks Meter: 79	Check out above mentioned side keys of volume ,and remove two capacitor between these two keys. its always work .

08-12-2005, 12:04	#7 (permalink)
Spacewalker Freak Poster Join Date: Feb 2004 Age: 43 Posts: 222 Member: 52245 Status: Offline Thanks Meter: 4	I have some problem with X450 . remove all capacitor, and other element - not weork. REMOVE Microfon - and WORK. change to good - and phone work