Only For Training And Service Purposes - LG GT500 Service Manual

4. TROUBLE SHOOTING
4.11.2 Bluetooth Clock path
1
TP2
U730 SN74LVC1G125DRLR
1
BT_CLKREQ_n _OE VCC
2
MCLKSEC A
3
GND Y
2
Main PCB (Bottom side)
LGE Internal Use Only
TP1
TP2
Sub PCB
TP1
VDD_BT
5
R730
4
33
C730 C731
0.1u 4.7u
TP3
(4
of the connector)
start
1. Check BTCLK
(Buffered MCLKSEC)
TP1: 26MHz
NG
2. Check
MCLKSEC
TP2: 26MHz
NG
3. Check
Mainboard Connector
TP3: 26MHz
BT_CLK
NG
Check RF3300
(U111)
th
pin from the end
24
25
26
27
28
29
30
G3 G4
- 112 - Copyright © 2009 LG Electronics. Inc. All right reserved.
1
OK
Go to 4.11.3
OK
Replace U730
2
OK
Replace Sub
PCB
TP3
37
36
FM_ANT
35
34
MCLKSEC
33
32
RTCCLK
31

Only for training and service purposes