LG U8290 Service Manual page 147

4. TROUBLE SHOOTING
TP1
TP4
TP3
Test Point (Bluetooth Block )
L507
16
ANT
1.5nH
13
NC SYNC_DET_TX_EN
2
LDO1
3
LDO2
2.2u 1u
1608
TCXO_EN
VREG_MSMP_2.6V
TP7
C503
TCXO_BT_IN
1000p
Schematic of Bluetooth RF Block
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VREG_MSMP_TCXO
VREG_BT_2.85V
U406
6
BT_SBST
SBST
10
BT_SBCK
SBCK
11
BT_SBDT
SBDT
5
BT_TX_RX_N
8
BT_DATA
RX_BB_TX_BB
C406 1000p
4
TCXO_BT
XTAL_IN
9
CLK_REF
RB06A
Q504
UMC4N
VREG_BT_2.85V
C542
1000p
R500
100K VCC
5
2
4
3
GND
U500
TC7S04FU
TP2
TP5
BT_CLK
TP6
VREG_MSMP_TCXO
TCXO_BT