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reserved. Only training and service purposes
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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~TP4
If GSM of All band
Over 28dBm?
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
Checking Tx signal (GSM850/900/1800/1900)
YES
NO
YES
Check TP5~TP6
If GSM of All band
Over 10dBm?
3.5.2 GSM, WCDMA, LTE PART - Tx
Image
BOTTOM
U1501
(WTR2965)
U1500
(WTR2965)
3.5 GSM, WCDMA, LTE PART
TP3(GSM 1800/1900 TX)
TP4(GSM 850/900 TX)
GSM 1800/1900
GSM 850/900
MMPA Output
MMPA Input
TP5(GSM 1800/1900_input TX)
GSM 1800/1900
TP6(GSM 850/900_input TX)
GSM 850/900
Circuit Diagram
TP1(+VPA0)
TP5
(GSM1800/1900_input Tx)
TP6
(GSM850/900_input Tx)
TP3
(GSM 1800/1900 TX)
TP4
(GSM 850/900 TX)
U1600
(MMPA)
U1801
(WTR2965)
U1800
(WTR2965)
21
Summary of Contents for LG-M700TV
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