LG KE520 Service Manual page 60

4.3.1 Checking BT Antenna
4.3.1.1 Visual Inspection
<Fig. 1>
Checking
R500, R501
Check 1.8V High
YES
Check SYS_CLK_REQ
4.3.1.2 Checking BT VRIO
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Only for training and service purposes
R500
0
C502
2.2u
NO
Check ABB
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4. TROUBLE SHOOTING
VRIO VRIO
C500
47u
R501
0
C504
C503
WLAN_SYSCLK
R504
CLK_32K
2.2u
WLAN_IRQ
WLAN_DEBUG_RX
R505
WLAN_DEBUG_TX
10K
SDIO_D1
SDIO_D2
SDIO_CMD
SDIO_CLK
SDIO_D3
SDIO_D0
SYS_CLK_REQ
TP510
MCSI1_DOUT
TP511
MCSI1_DIN
TP512
MCSI1_SYNC
TP513
MCSI1_BCLK
R501
R500
<Fig. 2>
U500
1
VSW
2
VFB
3
VDDIO
4
VDDHOSTIF
5
GND1
220p
6
CLK_IP
0 7
SLEEP_CLK
TP501 8
WLAN_IRQ
9
HOSTIF_LVL_SEL
10
RS232_RX
11
GND2
12
RS232_TX
TP502 13
SDIO_D1
TP503 14
SDIO_D2 BT_WA
TP505 15
SPI_DIN_SDIO_CMD
TP507 16
SPI_CLK_SDIO_CLK
TP508 17
SPI_CSX_SDIO_D3
TP509 18
SPI_DOUT_SDIO_D0
19
EXT_CLK_REQ
20
GND3
21
AUD_IN H
22
AUD_OUT HC
23
AUD_FSYNC
24
AUD_CLK H
1.8V High
LGE Internal Use Only