4. DOWNLOAD
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Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. Trouble Shooting
3.1.1.1 Checking DC Power supply circuit
Test Point
TP5 R1506
TP1 : C1506
(+1V825_MTK_VRF )
TP4: C1503
(+1V825_MTK_VRF )
TP5: R1506
(+2V8_MTK_VTCXO)
TP2: C1505
(+1V825_MTK_VRF )
MT6166
(U1500)
Circuit Diagram
TP3 : C1504
(+1V825_MTK_VRF )
TP2
TP4
TP5
TP1
TP3
TP2
TP4
TP5
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0
R1505
2
1
0
R1506
1u
C1500
1
2
470n
C1501
470n
C1502
470n
C1503
470n
C1504
+2V8_MTK_VTCXO
470n
C1505
C1506
470n
+1V8_MTK_VIO
+2V8_MTK_VTCXO
+1V825_MTK_VRF
VTXHF
VRXHF
VTCXO28
VXODIG
V28
2GHB_TX
2GLB_TX
VRXLF
VTXLF
AVDD_VIO18
GND9 GND10 GND11 GND12 GND13 GND14
H9
H4
H3
G9
G4
G3
K6
J11
L7
A11
B8
E10
K7 K1
F2
B11
2G_TX_HB
2G_TX_LB
12mil(100mA)
12mil(125mA)
10mil(35mA)
10mil(35mA)
TP5
TP2
TP4
TP1
TP3