LG KM710 Service Manual - Page 52

Bluetooth Trouble Shooting

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4. Trouble Shooting 4.3 Bluetooth Trouble Shooting start Set BT Test mode ON YES In Engineering mode(2945#*#) Set RF test mode and then BT ON Check BT Antenna Status NO (Refer to figure 1) Replace BT Antenna YES Check 1.8V from ABB NO (Refer to figure 2) Check ABB(U102) YES Check 26MHz (Refer to figure 3) NO Check TCXO or MAIN Transceiver YES Check BT_CLK_REQ NO (Refer to figure 4) Check BT Module YES Check BT_RF_OUT (Refer to figure 5) NO Check FL500(Balun Filter) YES YES YES Check DBB(U103) Re-Download S/W Replace BT Module & Analog switch Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 53 - LGE Internal Use Only

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- 53 -
4. Trouble Shooting
4.3 Bluetooth Trouble Shooting
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
star
t
Set BT Test mode
ON
In Engineering mode(2945#*#)
Set RF test mode and then BT ON
Check BT Antenna Status
(Refer to figure 1)
Check 1.8V from ABB
(Refer to figure 2)
Check 26MHz
(Refer to figure 3)
Check BT_CLK_REQ
(Refer to figure 4)
Check BT_RF_OUT
(Refer to figure
5)
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Re-Download S/W
Replace BT Module
Check DBB(U103)
& Analog sw
itch
Replace BT Antenna
Check ABB(U102)
Check TCXO or
MAIN Transceiver
Check BT Module
Check FL500(Balun Filter)
YES
YES
YES