Only For Training And Service Purposes - LG TU550 Service Manual

3. TECHNICAL BRIEF
3.11.4 Key Pad
There are 24 buttons and 3 side keys in Figure. Shows the Keypad circuit. 'END' Key is connected
On_SW to PMIC(PM6650).
COL0
ROW0
ROW1 1
ROW2 4
ROW3 7
ROW4 *
VREG_MSMP_2.7V
KEY_ROW(0)
KEY_ROW(1)
KEY_ROW(2)
KEY_ROW(3)
KEY_COL(0)
KEY_ROW(4)
KEY_COL(1)
KEY_COL(2)
KEY_COL(3)
KEY_COL(4)
LGE Internal Use Only
COL1 COL2
MP3
2 3
5 6
8 9
0 #
RA500
R403
10K
10K
501
1
500
4
506
7
HOT503
HOT4
Figure. Keypad Circuit
- 52 -
COL3 COL4
C/BACK MENU
Left Up
OK Right
SEND Option
Down Camera
KEY
HOT502 CLR500
HOT3 CLR
503 505 LEFT500
2 3 LEFT
502 504 OK500
5 6 OK
507 509 SND500
8 9 SND
508 HOT504 DN500
0 HOT5 DN
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

COL5 COL6
Side MOD
(up) (FF)
Side MOD
(down) (Play/Pause)
Side MOD
(function) (REW)
MENU500
MENU
UP500
UP
RIGHT500
RIGHT
SEARCH500
SEARCH
BACK500
BACK