LG GM750 Service Manual page 152

1) Measurement :Main-U502, U503
-. +VPWR : 4V (C505)
-. VREG_MSMP_2.6V : 2.6V (C509)
-. BL_I2C_SDA / SCL : data / CLK pulse (R508, R509)
-. U503 (GC1 / GC2) : data pulse
V R E G
L C D _ B L _ E N
B L _ 2 I C _ S C L
B L _ 2 I C _ S D A
U 5 0 3 B H 1 6 2 1 F V C
1 5
V C C I O U T
2
G N D 1
3 4
G C 1 G C 2
E U S Y 0 3 8 8 2 0 1
L u m n i a n c e S e n s r o
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Only for training and service purposes
L C D B A C K I L G H T
_ M S M P _ 2 6 . V + V P W R
C 5 0 9 C 5 0 5
1 u 4 7 . u
B 6
V B A T C P
F 4
V B A T 1
F 5
V B A T 2
D 5
I V O
B 4
R E S E T B
C 4
S C L
D 4
S D A
B 3
L C D _ P W M
W P W M N I
F 3
S B A I S
E 1
S S E N S
F 2
S G N D
D 3
G C 2
E 2
G C 1
C 5 2 1
R 5 0 2
1 u
1 0 K
R e . v 1 0 .
0 9 0 8 1 2
BL_I2C_SDA (R509)
C H A R G E P U M P
R e v B
D 6
V O U T
A 2
L E D 1
B 1
L E D 2
B 2
L E D 3
C 2
L E D 4
D 1
L E D 5
D 2
U 5 0 2 L E D 6
B D 6 0 8 3 G U L
V G A _ D V D D _ 1 8 . V
C 1
L E D G N D
P M _ C A M
E 6
L D O 1 O
E 5
L D O 2 O
E 4
d e e l e t d
L D O 3 O
E 3
L D O 4 O
C 5 0 8
1 u
VREG_MSMP_2.6V (C509)
- 153 -
4. TROUBLE SHOOTING
R e v B
R 5 0 1
W L E D _ P W R
0
C 5 2 0
W L E D 1
1 u
W L E D 2
W L E D 3
W L E D 4
W L E D 5
M D D _ I P _ D A T A _ P
W L E D 6
M D D _ I P _ D A T A _ M
M D D _ I P _ S T B _ P
M D D _ I P _ S T B _ M
_ A F _ 2 8 . V
V G A _ A V D D _ 2 8 . V V G A I _ O V D D _ 2 8 . V
F B 5 0 5
S F B H 0 0 0 0 9 0 9
C 5 2 8 C 5 2 2
1 u 1 u
+VPWR (C505)
BL_I2C_SCL (R508)
LGE Internal Use Only