LG KF700Q Service Manual page 73

4. TROUBLE SHOOTING
VREG_MSMP_2.7V
KEY_ROW(0)
KEY_ROW(1)
KEY_ROW(2)
KEY_ROW(3)
KEY_COL(0)
KEY_COL(1)
KEY_COL(2)
KEY_COL(3)
VA514
VA511
LGE Internal Use Only
C502
0.1u
RA500
501
1
504
4
507
7
HOT501
HOT4
VA513 VA512
[Fig. 4.1] Schematic of key sense part (KEY FPCB)
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PM_ON_SW_N
VA510
PRSB6.8C
502 503 SND
2 3
505 506 CLR
5 6
508 509
8 9
510 HOT502
0 HOT3
V V A500
VA507
VA508
VA509
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
END