LG M6100 Service Manual - Page 69
TEST POINT, CIRCUIT, Checking Flow, Waveform
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4. TROUBLE SHOOTING (5) Checking TX 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 Graph 4-9 VBAT IP C511 39p IN QN C512 C513 C514 39p 0.1u 33p QP Checking Flow Check if there is Any Major Difference Refer to Graph 4-9 Similar? Yes No Replace U501 Redownload the Software And calibrate - 70 -
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(5) Checking TX IQ
4. TROUBLE SHOOTING
- 70 -
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
Redownload
the Software
And calibrate
Check if there is
Any Major Difference
Refer to Graph 4-9
Similar?
Yes
No
Replace U501
TEST POINT
CIRCUIT
Checking Flow
Waveform
Graph 4-9