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Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
Regulator
Check TP2,TP3 are 2.8V
NO
YES
Replace
U400
Regulator is OK.
CHECKING FLOW
Fig4-5. Regulator schematic
Fig4-7. Regulator output Voltage
Fig4-4. Regulator placement
U400
TP3
TP2
Check TP1 is 4v
NO
Check
U100
YES
Fig4-6. Regulator Enable voltage
TP1 4V
TP2
TP3
TP1
4.2.1.1 Regulator Circuit
KCOLB FR
05
11
04
R
9
NI
V
1
1
T
UO
V
8
7
2
T
U
O
V
WQ
PM
M
-
1
1
0
9
TR00
4U
2
1
N
E
2N
E
3
5
D
NG
1C
N
4
2
C
N
6
PGND
u
7
.
4
N
YSFRV
_
8
V
2
90
4
C
E
R
O
C
F
R
V
_8V
2
004
R
I
N
D
TA
B
V
u
1
1
1
4
C
OI
V_8
V
1
u
7.
4
8
0
4
C
N
E
_
ODL_T
X
E
TP1
TP2
TP3
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