LG GT500 - Page 111

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.11.2 Bluetooth Clock path
TP2
TP1
start
1. Check BTCLK
(Buffered MCLKSEC)
TP1: 26MHz
2. Check
MCLKSEC
TP2: 26MHz
1
2
TP3
(4
th
pin from the end
of the connector)
1
2
Go to 4.11.3
OK
NG
Replace U730
OK
NG
3. Check
Mainboard Connector
TP3: 26MHz
Replace Sub
PCB
OK
NG
Check RF3300
(U111)
Main PCB (Bottom side)
Sub PCB
A
2
3
GND
5
VCC
Y
4
1
_OE
SN74LVC1G125DRLRU730
C730
0.1u 4.7u
C731
R730
33
R731 100K
VDD_BT
BT_CLKREQ_n
BT_CLK
MCLKSEC
TP1
TP2
G3 G4
30 31
32
33
34
35
36
37
24
25
26
27
28
29
FM_ANT
MCLKSEC
RTCCLK
TP3