Lte1/2/3/4/5/7/8/17/20/28A/28B Tx - LG -H815 Service Manual

3.7.2 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
TP2(+VPWR_BOOST_BYPASS_RF)
U1400
U1300
28
3. TROUBLE SHOOTING
Image
TP1(+VPA0)
BOTTOM
TP4
TP3((+VPA0)
TP10(Band8 Tx)
TP9(Band5 Tx)
TP6(Band2 Tx)
TP8(Band4 Tx)
TP5(Band1 Tx)
TP7(Band3 Tx)
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