LG -H815 Service Manual page 31

3.7.3 LTE PART
LTE1/2/3/4/5/7/8/17/20/28A/28B Tx
Checking Flow
START
Check TP1 /TP3/TP4
+VPA0 OK?
YES
Check TP2/TP16
3.2V≤TP2≤4.2V?
YES
Check TP5/6/7/8/9/10/11/12/13/14/15/16/
If LTE of All band Over 22dBm?
NO
Check TP5/6/7/8/9/10/11/12/13/14/15/16/
If LTE of All band Over 10dBm?
NO
NOT GOOD
Check Transceiver
physical damage
or soldering condition
OK?
Check next step
LGE Internal Use Only
The Problem may be Other part
Check QFE2101 Logic part
NO
The Problem may be Other part
Check QFE2101 Logic part
NO
Check component
YES above RF signal path
Replace U1300
YES
Replace U1500
U1300
U1750
31
3. TROUBLE SHOOTING
Image
TP11(Band7 Tx)
TP15(Band28B Tx)
TP14(Band28A Tx)
@JahanIC
TP13(Band20 Tx)
TP12(Band17 Tx)
TP16(+VPWR_BOOST_BYPASS_RF)
TP4(+VPA0)
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