3120 "5" number key not working. . . - GSM-Forum

harish35200 · 12-31-2006, 07:48

i had nokia 3120 in which 5 number key not working . . . i had clean the phone properly with ipa solution but it didn't work. . .can anybody tell me how to repair it. . .

rajeshbahri · 12-31-2006, 08:07

Quote:

Originally Posted by harish35200

i had nokia 3120 in which 5 number key not working . . . i had clean the phone properly with ipa solution but it didn't work. . .can anybody tell me how to repair it. . .

SIR PLZ HEAT CPU WITH FLEX OTHERWISE REBALL 100% SURE SOLUTION TESTED BY ME

GSM_BLUE · 12-31-2006, 09:05

if you trace the keypad track on schematic you will see that the number 5 key will go first to the emf filter (buzzer ic) before it goes directly to the CPU.. try to reheat or replace the filter first..... if no joy.. then you need to reflow UPP or replace otherwise..

wbr...

.:KHALIFA:. · 12-31-2006, 10:15

cpu..... 11000000000000%

abhishekh53 · 12-31-2006, 13:50

reflow upp 100% prob solve.

abhishekh

.::AkhavanGSM::. · 12-31-2006, 15:11

There is diffrence between key 5 and other keys of 3120.
All keys are controled by KEYB line.
but col5 ( key 5) by GENIO.

It is 100% UPP problem or PCB problem(track from UPP to key 5)

HUM · 01-01-2007, 00:38

yes 100% upp....!and sometime uem....!

capri · 01-01-2007, 10:07

100 % cpu problem or the line connected to 5 keyboard. not UEM.

meet_2007 · 01-01-2007, 10:41

reball cpu it is 100% solution tested by me many times.

arorasatishkuma · 01-01-2007, 16:28

Use outer of number "6" & inner of number "8" to have number "5"
------------------------------------------------------------------
Same problem was in my own set
---------------------------------------------
1 Make jumper between outers of Number "5" & Number "6"
2 Cover inner of number "5" with piece of paper
3 Now solder a piece of wire at inner of number "8" & leave other end of
the wire at inner of number"5" This end is not to be soldered,just leave
it on the paper which was used to cover inner of number"5"
Try IT
ENJOY

.::AkhavanGSM::. · 01-02-2007, 14:12

arorasatishkuma 's solution is IMPOSSIBLE for 3120.
becuse outers of number 5 is GROUND and if you connect a wire you will lose some other keys for shorting ground!
Just look at attachmnet picture.number 5 in 3120 phones work diffrent .directly from CPU.
It is TRUE for some other models like 2600.but 100% wrong for 3120

harish35200 · 01-02-2007, 14:44

so what to do then ?

arorasatishkuma · 01-02-2007, 16:26

Sir as told above I am using this method. Some how it is working.All keys are workig ok.
arorasatishkumar
Ludhiana (PB.)

I am attaching the thumbnail

.::AkhavanGSM::. · 01-02-2007, 16:59

If it is really working I must harvest schematic again.may be there is an unused port on KBLINE

.:KHALIFA:. · 01-02-2007, 21:19

Quote:

Originally Posted by arorasatishkuma

Sir as told above I am using this method. Some how it is working.All keys are workig ok.
arorasatishkumar
Ludhiana (PB.)

I am attaching the thumbnail

i dont think it should work... coz this solution to 5 will surely efect other keys... they might have some secondry shorting.... its really a bad solution..

why u simply reball cpu.... it works 1000000000000000000%

... n the phone doesnt look dirty as urs.... really bad solution....

12-31-2006, 07:48	#1 (permalink)
harish35200 No Life Poster Join Date: Jan 2006 Location: india Age: 45 Posts: 865 Member: 216088 Status: Offline Thanks Meter: 43	3120 "5" number key not working. . . i had nokia 3120 in which 5 number key not working . . . i had clean the phone properly with ipa solution but it didn't work. . .can anybody tell me how to repair it. . .

01-01-2007, 16:28	#10 (permalink)
arorasatishkuma No Life Poster Join Date: Jul 2006 Posts: 1,034 Member: 319612 Status: Offline Thanks Meter: 1,452	3120 "5" number Key Solution Use outer of number "6" & inner of number "8" to have number "5" ------------------------------------------------------------------ Same problem was in my own set --------------------------------------------- 1 Make jumper between outers of Number "5" & Number "6" 2 Cover inner of number "5" with piece of paper 3 Now solder a piece of wire at inner of number "8" & leave other end of the wire at inner of number"5" This end is not to be soldered,just leave it on the paper which was used to cover inner of number"5" Try IT ENJOY Last edited by arorasatishkuma; 01-02-2007 at 07:43.

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12-31-2006, 09:05	#3 (permalink)
GSM_BLUE No Life Poster Join Date: Sep 2006 Age: 41 Posts: 857 Member: 356202 Status: Offline Thanks Meter: 46	if you trace the keypad track on schematic you will see that the number 5 key will go first to the emf filter (buzzer ic) before it goes directly to the CPU.. try to reheat or replace the filter first..... if no joy.. then you need to reflow UPP or replace otherwise.. wbr...

12-31-2006, 10:15	#4 (permalink)
.:KHALIFA:. No Life Poster Join Date: May 2006 Location: U wont beleive Age: 43 Posts: 1,293 Member: 275631 Status: Offline Thanks Meter: 408	cpu..... 11000000000000%

12-31-2006, 13:50	#5 (permalink)
abhishekh53 Insane Poster Join Date: Apr 2006 Posts: 95 Member: 255625 Status: Offline Thanks Meter: 13	reflow upp 100% prob solve. abhishekh

12-31-2006, 15:11	#6 (permalink)
.::AkhavanGSM::. No Life Poster Join Date: Jun 2002 Location: Iran Age: 47 Posts: 1,082 Member: 12724 Status: Offline Thanks Meter: 30	There is diffrence between key 5 and other keys of 3120. All keys are controled by KEYB line. but col5 ( key 5) by GENIO. It is 100% UPP problem or PCB problem(track from UPP to key 5)

01-01-2007, 00:38	#7 (permalink)
HUM No Life Poster Join Date: Jul 2005 Location: karachi Posts: 8,673 Member: 161728 Status: Offline Sonork: 100.1582708 Thanks Meter: 2,237	yes 100% upp....!and sometime uem....!

01-01-2007, 10:07	#8 (permalink)
capri No Life Poster Join Date: Nov 2006 Location: Philippines - Saudi Arabia Posts: 539 Member: 396326 Status: Offline Thanks Meter: 229	100 % cpu problem or the line connected to 5 keyboard. not UEM.

01-01-2007, 10:41	#9 (permalink)
meet_2007 Junior Member Join Date: Dec 2006 Posts: 18 Member: 418843 Status: Offline Thanks Meter: 1	reball cpu it is 100% solution tested by me many times.

01-02-2007, 14:44	#12 (permalink)
harish35200 No Life Poster Join Date: Jan 2006 Location: india Age: 45 Posts: 865 Member: 216088 Status: Offline Thanks Meter: 43	so what to do then ?

01-02-2007, 16:59	#14 (permalink)
.::AkhavanGSM::. No Life Poster Join Date: Jun 2002 Location: Iran Age: 47 Posts: 1,082 Member: 12724 Status: Offline Thanks Meter: 30	If it is really working I must harvest schematic again.may be there is an unused port on KBLINE