LG KG245 Service Manual page 63

4. TROUBLE SHOOTING
4.5 Bluetooth Section Trouble Shooting
TEST POINT
CIRCUIT
BLUETOOTH
BT_EN
PCM_TX
USC3
U205
TC7SH08FS
R233
(DEBUG_TX)
R232
(DEBUG_RX)
R237
(PCM_SYNC8)
Figure 4-12(a). Bluetooth Section Trouble Shooting
VBAT
U203
VIN VOUT
R228 3 4
GND BGND
330 2 6
STBY NC
1 5
BH28FB1WHFV
C232 C231 C230
0.1u 2.2u 15p
2V8_VBT
2V8_VMEM
C236
0.1u
5
1
VCC
4
PCM_SYNC8
3
GND
2
C2 C4
PCM_EN IN1 NO1
A2 A4
IN2 NO2
C3 C1
USC1
COM1 NC1
A3 A1
USC2
COM2 NC2
R240
U206
10K
MAX4717EBC-T
Figure 4-12(b). Bluetooth Section Trouble Shooting
R238
R235
(USC0)
(PCM_TX)
M201
2V8_VBT
L201
NA
C233 C234
2.2u 15p
16
_BT_RST RESETB VDD_1_8V
VDD_DIG
C237
VDD_VREGIN
1
NA PIO0
2
PIO1 GND1
7
C240 PIO2 GND2
8
0.1u
PIO3 GND3
9
PIO4 GND4
10
PIO5
UART_TX
PCM_RX UART_RX
28
NC UART_RTS
PCM_TX UART_CTS
13
USC_1 SPI_CLK PCM_IN
14
SPI_CSB PCM_OUT
12
USC_2 SPI_MOSI PCM_SYNC
15
SPI_MISO PCM_CLK
M201
LBMA-2C67B2
- 64 -
R236
(PCM_RX)
R227
(ANT)
ANT201
GND1
R227
FEED GND2
0
AMAN542015LG02
C248 (SNGF0008801)
NA
2V8_VBT
22
21
3
L202
C249 C238 C239
4
22nH
15p 2.2u 2.2u
6
11
25
27 R232 47
DEBUG_RX
R233 47
24
DEBUG_TX
23
26
19 R235 47
PCM_TX
17 R236 47
PCM_RX
18
R237 47
PCM_SYNC8
20 R238 47
USC0