LG H990ds Service Manual page 32

3.5.6 LTE PART – LTE B5/B8/B12/B17/B20/B26/B28 DRx
Checking DRX RF signal path (B5/B8/B12/B17/B20/B26/B28)
START
Check TP1
Signal exist?
YES
Check TP2
Signal exist?
YES
Check TP3
Signal exist?
YES
Check TP4/TP5
Signal exist?
YES
Check Transceiver
physical damage or soldering
condition
OK
Check next step
LGE Internal Use Only
Checking Flow
Check SW1100 Soldering
NO
Check FL1200 Soldering
NO
Check U1202 Soldering
NO
Check U1204 Soldering
NO
Replace U1401
NOT GOOD
Image
BOTTOM
SW1100
FL1200
TP1
(DRx Common)
U1202
U1204
TP2
(B5/B8/B12/B17/B20
/B26/B28 DRx )
TP4
(B5/B8/B26 DRx)
32
3. TROUBLE SHOOTING
TP3
(B5/B8/B12/B17/B20
/B26/B28 DRx )
TP5
(B12/B17/B20/B28 DRx)
TOP
U1401
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