LG B2050 Service Manual - Page 51

VC1 :Low or HIGH, VC2 :Low, VC3 :Low, Short, Pin1 :~ -62dBm, n 3,5 :~ -63dB

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Page 51 highlights

4 . TROUBLE SHOOTING Checking Flow For these 2 test case, No Call connection is needed Check SW501 Pin ANT,RF with RF Cable connected. No Open Yes Check SW500 Pin ANT,RF Short No with No RF Cable Connected Yes Check R512, R515, R517 Check whether FEM Set as RX mode Refer toTable 4-2 VC1 :Low or HIGH No VC2 :Low VC3 :Low Yes Check RF Level of FL500.1 (for GSM) & FL500.3 (for DCS) & FL500.5 (for PCS) Pin1 : ~ -62dBm No n 3,5 : ~ -63dB Yes FEM & Mobile SW is OK See next Page to check Rx IQ Signal Changing SW500 Changing SW500 Changing the board Changing FL500 For this RF Level test case, RX Stand alone Mode is needed refer to chapter 11 ANT SW CONTROL TABLE ANT SW VC1 EGSM_Tx L DCS PCS_Tx L EGSM DCS_ Rx L PCS_Rx H VC2 VC3 L H H L L L L L Table 4-2 - 50 -

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- 50 -
Checking Flow
Check R512, R515, R517
Check whether FEM
Set as RX mode
Refer toTable 4-2
Yes
VC1 :Low or HIGH
VC2 :Low
VC3 :Low
Check SW501 Pin ANT,RF
with RF Cableconnected
.
Open
Yes
Changing SW500
Check SW500Pin ANT,RF
with No RF Cable Connected
Short
Yes
Changing SW500
For these 2
tes
t
case,
No Call connection is needed
No
No
Check RF Level of
FL500.1 (for GSM) & FL500.3
(for DCS) & FL500.5
(for PCS)
FEM & Mobile SW is OK
See next Page to check
Rx IQ Signal
Pin1 :~ -62dBm
n 3,5 :~ -63dB
No
Changing FL500
Yes
No
For this RF Level test case,
RX Stand alone Mode is needed
refer to chapter 11
Changing the board
Table 4-2
ANT SW
EGSM_Tx
DCS PCS_Tx
EGSM DCS_ Rx
PCS_Rx
VC1
L
L
L
H
ANT SW CONTROL TABLE
VC2
L
H
L
L
VC3
H
L
L
L
4 . TROUBLE SHOOTING