LG LG-H815 - Checking Tx Signal Path

Copyright ⓒ 2015 LG Electronics. Inc. All right
reserved. Only training and service purposes
LGE Internal Use Only
3. TROUBLE SHOOTING
Checking Tx signal path (B1/B2/B5/B8 Tx)
3.6.3 WCDMA PART
Checking Flow Image
Check TP1/2/3/4
Signal is over 23dBm?
START
Check next step
Check component
above RF signal
path
YES
NO
Check TP5/6
Signal is over 3.5dBm
NO
YES
Check U1300
Soldering
Check Transceiver
physical damage
or soldering condition
OK?
Replace U1500
NOT GOOD
TP1
TP3
TP2
TP5
TP6 TP4
U1300
24