LG M6100 Service Manual - Page 61

Table 4-2

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4. TROUBLE SHOOTING Checking Flow For these 2 test case, No Call connection is needed Check SW500 Pin ANT,RF with RF Cable connected. Check SW601 Pin ANT,RF with No RF Cable Connected Check C505,C506,C507 Check whether FEM Set as RX mode Refer to Table 4-2 Open No Yes Short No Yes VC1 :Low or HIGH No VC2 :Low VC3:LOW Yes Changing SW501 Changing SW501 Changing the Board. Check RF Level of FL501.6 (for GSM) & FL501.4 Pin6 : ~ -62dBm No (for DCS) & FL501.2 (for PCS) Pin 4,2 : ~ -63dBm Yes FEM & Mobile SW is OK See next Page to check Rx IQ Signal For this RF Level test case, RX Stand alone Mode is needed Changing FL501 EGSM-Tx EGSM-Rx DCS/PCS-Tx DCS-Rx PCS-Rx Vc1 0.0-0.1V 0.0-0.1V 0.0-0.1V 0.0-0.1V 2.3-3.0V Vc2 0.0-0.1V 0.0-0.1V 2.3-3.0V 0.0-0.1V 0.0-0.1V Table 4-2 Vc3 2.3-3.0V 0.0-0.1V 0.0-0.1V 0.0-0.1V 0.0-0.1V Current 10mA Max ≈ 0mA 10mA Max ≈ 0mA 10mA Max - 62 -

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4. TROUBLE SHOOTING
- 62 -
Check C505,C506,C507
Check whether FEM
Set as RX mode
Refer to Table 4-2
Yes
VC1 :Low or HIGH
VC2 :Low VC3:LOW
Check SW500
Pin ANT,RF
with RF Cable connected.
Open
Yes
Changing SW501
Check SW601
Pin ANT,RF
with No RF Cable Connected
Short
Yes
Changing SW501
For these 2 test case,
No Call connection is needed
No
No
Changing the Board.
Check RF Level of
FL501.6 (for GSM) & FL501.4
(for DCS) & FL501.2 (for PCS)
FEM & Mobile SW is OK
See next Page to check
Rx IQ Signal
Pin6 : ~ -62dBm
Pin 4,2 : ~ -63dBm
No
Changing FL501
Yes
No
For this RF Level test case,
RX Stand alone Mode is needed
Checking Flow
Table 4-2
Vc1
Vc2
Vc3
Current
EGSM-Tx
0.0-0.1V
0.0-0.1V
2.3-3.0V
10mA Max
EGSM-Rx
0.0-0.1V
0.0-0.1V
0.0-0.1V
≈ 0mA
DCS/PCS-Tx
0.0-0.1V
2.3-3.0V
0.0-0.1V
10mA Max
DCS-Rx
0.0-0.1V
0.0-0.1V
0.0-0.1V
≈ 0mA
PCS-Rx
2.3-3.0V
0.0-0.1V
0.0-0.1V
10mA Max