K750 Keypad Problems - GSM-Forum

qwerty50c · 12-18-2006, 16:48

Hi,

My K750 has a problem where the joystick, back key and 7,8,9 do not work. Anybody got any solutions?
Thanks and br.

p.s I cant test anything yet because my EROM needs reparing and im waiting for the screwdrivers to arrive.

Speed_Demon · 12-18-2006, 18:10

Quote:

Originally Posted by qwerty50c

Hi,

My K750 has a problem where the joystick, back key and 7,8,9 do not work. Anybody got any solutions?
Thanks and br.

p.s I cant test anything yet because my EROM needs reparing and im waiting for the screwdrivers to arrive.

This is a very common problem with the k750i/W800i. I've repaired many of these phones. Its a faulty Keypad IC or joystick, or both. Take note to change the Keypad IC first. This way you will know if the joystick is faulty as well. I've had cases where the joystick and Keypad IC does'nt work and I change just the keypad IC and it works. Other cases where I had to replace the joystick as well.

BE CAREFULL when taking the IC and joystick off. The CPU is on the reverse side!!!

If you need pics let me know....

Post result...

(Hope you have nerves of steel)

qwerty50c · 12-18-2006, 19:11

Thanks

Ill take a look when the T6's arrive.

Br.

v_mam30 · 12-18-2006, 19:28

Remove Varistor protect keypad.

newbie3 · 01-10-2007, 18:24

Quote:

Originally Posted by Speed_Demon

This is a very common problem with the k750i/W800i. I've repaired many of these phones. Its a faulty Keypad IC or joystick, or both. Take note to change the Keypad IC first. This way you will know if the joystick is faulty as well. I've had cases where the joystick and Keypad IC does'nt work and I change just the keypad IC and it works. Other cases where I had to replace the joystick as well.

BE CAREFULL when taking the IC and joystick off. The CPU is on the reverse side!!!

If you need pics let me know....

Post result...

(Hope you have nerves of steel)

Would you post the picture please ? I have a K750i , water damage and 1,2,3 key doesn't work.
Thanks

Speed_Demon · 01-13-2007, 15:15

Here is pic............................................... ..................

gsmshare98 · 01-14-2007, 11:19

yes u need change joystick and keypad ic,i had solved this problem so many,so pls try this ,i hope u can solve,,,

cearful backsite have cpu,
all the best

andyaye · 01-16-2007, 11:08

How do you change that tiny piece, unless you are a manufacturer with a whole wave soldering factory.??

attilaafiu · 01-30-2007, 12:24

really helpful, thanx bro!

Gworld · 02-02-2007, 13:43

thanx to all i fix w800i joy stick proble by chang keypad ic

hooi76 · 02-02-2007, 18:55

is the nokia 7610 key pad driver or lcd driver compatible with this ic?

malcomxyz · 02-02-2007, 21:44

there are two diffrent µBGA´s at the nokia phones.....one with 24 balls and 0ne with 25 balls....you need this one with 25 balls. you can find it at f.e 7650

asghar_khan870 · 12-01-2008, 12:35

thanks for ur solution

gants · 06-01-2009, 08:24

Quote:

Originally Posted by v_mam30

Remove Varistor protect keypad.

dear v_mam30,

which varistor should i remove for 1,2,3 and 7,8,9, do you have the picture of the lacation of varistor.

TQ

Malik_Brothers · 10-04-2009, 09:14

thanks brothers solv my problem vary thanks

12-18-2006, 16:48	#1 (permalink)
qwerty50c Junior Member Join Date: Apr 2006 Location: lonDON Posts: 16 Member: 268230 Status: Offline Thanks Meter: 1	K750 Keypad Problems Hi, My K750 has a problem where the joystick, back key and 7,8,9 do not work. Anybody got any solutions? Thanks and br. p.s I cant test anything yet because my EROM needs reparing and im waiting for the screwdrivers to arrive.

01-16-2007, 11:08	#8 (permalink)
andyaye Junior Member Join Date: Jan 2007 Posts: 18 Member: 432483 Status: Offline Thanks Meter: 0	Replace joystic/keypad IC How do you change that tiny piece, unless you are a manufacturer with a whole wave soldering factory.??

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12-18-2006, 19:11	#3 (permalink)
qwerty50c Junior Member Join Date: Apr 2006 Location: lonDON Posts: 16 Member: 268230 Status: Offline Thanks Meter: 1	Thanks Ill take a look when the T6's arrive. Br.

12-18-2006, 19:28	#4 (permalink)
v_mam30 Freak Poster Join Date: Nov 2004 Age: 49 Posts: 147 Member: 94637 Status: Offline Thanks Meter: 6	Remove Varistor protect keypad.

01-14-2007, 11:19	#7 (permalink)
gsmshare98 Freak Poster Join Date: Jan 2007 Posts: 102 Member: 429638 Status: Offline Thanks Meter: 2	yes u need change joystick and keypad ic,i had solved this problem so many,so pls try this ,i hope u can solve,,, cearful backsite have cpu, all the best

01-30-2007, 12:24	#9 (permalink)
attilaafiu Junior Member Join Date: May 2005 Location: wandering Posts: 27 Member: 144241 Status: Offline Thanks Meter: 1	really helpful, thanx bro!

02-02-2007, 13:43	#10 (permalink)
Gworld Freak Poster Join Date: Feb 2006 Posts: 258 Member: 235448 Status: Offline Thanks Meter: 18	thanx to all i fix w800i joy stick proble by chang keypad ic

02-02-2007, 18:55	#11 (permalink)
hooi76 No Life Poster Join Date: Dec 2001 Location: In front of my computer Posts: 1,594 Member: 7741 Status: Offline Thanks Meter: 111	is the nokia 7610 key pad driver or lcd driver compatible with this ic?

02-02-2007, 21:44	#12 (permalink)
malcomxyz Freak Poster Join Date: Jun 2004 Posts: 140 Member: 68105 Status: Offline Thanks Meter: 7	there are two diffrent µBGA´s at the nokia phones.....one with 24 balls and 0ne with 25 balls....you need this one with 25 balls. you can find it at f.e 7650

12-01-2008, 12:35	#13 (permalink)
asghar_khan870 Freak Poster Join Date: Jan 2007 Location: Birmingham United Kingdom Age: 36 Posts: 192 Member: 442749 Status: Offline Thanks Meter: 16	thanks for ur solution

10-04-2009, 09:14	#15 (permalink)
Malik_Brothers Junior Member Join Date: Jun 2009 Location: pakistan multan Posts: 30 Member: 1046052 Status: Offline Thanks Meter: 6	thanks brothers solv my problem vary thanks