LG M6100 Service Manual - Page 62
TEST POINT, Checking Flow, Waveform, CIRCUIT
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4. TROUBLE SHOOTING (4) Checking RX IQ TEST POINT Waveform CIRCUIT 1 VCC3 2 I+_TX_I+ I-_TX_I- 3 Q-_TX_Q- 4 5 Q+_TX_Q+ VCC1 6 C508 22u C509 33p C510 0.1u VBAT IP C511 39p IN QN C512 C513 C514 39p 0.1u 33p QP Checking Flow Graph 4-4 Check C512,C513. Check if there is any Major difference Refer to grapa 4-4 Similar? Yes No Replace U501 Redownload software and calibration again - 63 -
4. TROUBLE SHOOTING
- 63 -
(4) Checking RX IQ
Redownload software and calibration again
Similar?
No
Replace U501
Yes
No
Check C512,C513.
Check if there is any
Major difference
Refer to grapa 4-4
VBAT
0.1u
C513
C509
33p
5
Q+_TX_Q+
Q-_TX_Q-
4
VCC1
6
1
VCC3
I+_TX_I+
2
3
I-_TX_I-
C514
33p
C512
39p
C511
39p
C508
22u
C510
0.1u
QN
QP
IN
IP
TEST POINT
Checking Flow
Waveform
CIRCUIT
Graph 4-4