LG KG920 - BT Trouble

4.2 BT Trouble
4. TROUBLE SHOOTING
- 86 -
TEST POINT
CIRCUIT DIAGRAM
DUBUG_TX
R326
DUBUG_RX
R323
BT_RST
C305
BT_EN
R311
M300
Figure 4-22.
Figure 4-23.
BLUETOOTH
(GPIO_8)
(GPO_18)
(GPIO_2)
C3
COM1
A3
COM2
B1
GND
C2
IN1
A2
IN2
NC1
C1
A1
NC2
C4
NO1
A4
NO2
B4
V+
U302
MAX4717EBC-T
10K
R333
2V8_VMEM
C317
0.1u
47R330
1
3
4
5
VCC
TC7SH08FS
U301
GND
2
NA
R313
R327 47
47R329
2V8_VBT
BGND
62
GND
NC
51
STBY
3
VIN VOUT
4
BH28FB1WHFV
U300
NA
R312
0.1u
C304
15p
C308C306
2.2u
0
R308
R331 47
ANT300
FEED
NC1
NC2
R326 47
2.2u
C300
330
R311
0.1u
C303
2V8_VBT
VBAT
2V8_VBT
R323
C302
47
4.7u
PIO5
16
RESETB
13
SPI_CLK
14
SPI_CSB
SPI_MISO
15
12
SPI_MOSI
26
UART_CTS
UART_RTS
23
24
UART_RX
UART_TX
27
22
VDD_1_8V
VDD_DIG
21
VDD_VREGIN
3
ANT
5
4
GND1
6
GND2
GND3
11
GND4
25
28
NC
20
PCM_CLK
19
PCM_IN
PCM_OUT
17
18
PCM_SYNC
PIO0
1
2
PIO1
PIO2
7
8
PIO3
PIO4
9
10
LBMA-2C67B2M300
15p
C301
C305
NA
R342
0
2.2u
C307
PCM_TX
PCM_SYNC8
USC3
USC_2
USC_1
PCM_EN
USC0
PCM_TX
PCM_SYNC8
BT_RST
PCM_RX
DEBUG_RX
DEBUG_TX
BT_EN
USC2
USC1
PCM_TX
PCM_RX