Copyright ⓒ 2017 LG Electronics. Inc. All right
reserved. Only training and service purposes
LGE Internal Use Only
3. TROUBLE SHOOTING
Checking Flow
Check TP1
+VPA0 OK?
START
The Problem may be Other part
Check QFE2101 Logic part
NO
The Problem may be Other part
Check PMI8952 Logic part
Check TP2
3.4V≤TP2≤4.4V?
Check TP3~TP11
If LTE of All band
Over 22dBm?
NO
Check next step
Check component
above RF signal path
and FEMiD block
YES
YES
Replace U1600
NO
Check
Transceiver physical damage
or soldering condition
OK?
NOT GOOD
Replace U1800/U1801
YES
NO
YES
Check TP12~TP15
If WCDMA/LTE of All band
Over 0dBm?
3.5.2 GSM, WCDMA, LTE PART - Tx
Image
BOTTOM
U1801
(WTR2965)
U1800
(WTR2965)
3.5 GSM, WCDMA, LTE PART
TP3(B1 Tx)
TP6(B8 Tx)
TP7(B5 Tx)
TP1(+VPA0)
U1600
(MMPA)
TP4(B2 Tx)
TP5(B3 Tx)
TP2(+VPWR)
TP14
(MB_input Tx)
TP9(B28A Tx)
TP11(B7 TX)
TP13
(HB_input TX)
Checking Tx signal path(WCDMA B1/B2/B3/B5/B8, LTE B1/B2/B3/B5/B7/B17/B28)
TP12
(LB_input Tx)
TP10(B28B Tx)
TP8(B17 Tx)
18
Содержание LG-M700TV
Страница 115: ...P N FLXXXXXXXX X X 115 ...