6600 key pad not working

6600 keypad ics solution

--------------------------------------------------------------------------------

When some keys of Nokia 6600 r not working and problem is in keypad ics then somtimes we have confused which ic we should replaced first.Im giving some hints to make easy to diagnose which ic is faulty upper or lower.
Upper ic = Connector Pin
1. Gnd
2. 3,6,9,#
3. 1,4,7,ABC
4. call,4,5,6
5. clr,ABC,*,#
6. +v led
7. Right soft key
8. Menu,Left,Soft key
9. Joystic (Right)
10. joystic (Left)

Lower ic = Connector pin
11. Joystic (center)
12. Joystic (down)
13. Joystic (Up)
14. Leftsoft key,Right soft key
15. Gnd
16. 1,2,3,0
17. End call,7,8,9
18. Menu
19. 2,5,8,*
20. Call,End call,Clr,0

According to this if sometime few keys r not working in sequence then find in this chart.For example if 1,2,3,0 together r not working then we have to replace lower ic and if 1,4,7,ABC r not working then upper ic is faulty.