LG GX500 Service Manual page 109

4. TROUBLE SHOOTING
GX500 Operational Description
GX500 Operational Description GX500 Operational Description
4.14.1 Checking Main Clock part
Checking Points
4.14.1 Checking Main Clock part 4.14.1 Checking Main Clock part
Checking Points Checking Points
Figure 4-62. WI-FI/BT/FM Clock part
Figure 4-62. WI-FI/BT/FM Clock part Figure 4-62. WI-FI/BT/FM Clock part
LDO for TCXO
VBAT
TOUCH_EN
C643
R607
1u 100K
Figure 4-63. WI-FI/BT/FM Clock Circuit
Figure 4-63. WI-FI/BT/FM Clock Circuit Figure 4-63. WI-FI/BT/FM Clock Circuit
LG Electronics
LGE Internal Use Only
LG Electronics LG Electronics
TP2(26MHz)C645
TP2(26MHz)C645 TP2(26MHz)C645
TP1 (CLK_REQ)R606
TP1 (CLK_REQ)R606 TP1 (CLK_REQ)R606
2V7_VTOUCH VDD_TCXO
U604
1 8
VIN VOUT1
2 7
EN1 VOUT2
3 6
P2 GND
4 5
P1 EN2
C646
1u
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Checking Flow
START
Checking Flow Checking Flow
START START
(TP1,2) is OK ?
(TP1,2) is OK ? (TP1,2) is OK ?
Check Module Part
Check Module Part Check Module Part
CLK_IN
BT_CLK_REQ
C647
TP2 (26MHz)
1u
TP1 (CLK_REQ)
TP1 (CLK_REQ)
TP1 (CLK_REQ) TP1 (CLK_REQ)
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Revision A
Revision A Revision A
No
No No
Yes
Yes Yes
26MHz TCXO
VDD_TCXO
26MHZ
VCC GND
4
OUT
3
TG-5010LH-87N X601
C644
1uF
TP2 (26MHz)
TP2 (26MHz) TP2 (26MHz)
LGE Property
Only for training and service purposes
LGE Property LGE Property
Check
TCXO
Check Check
TCXO TCXO
2
NC
1