PX8700
LG Electronics Inc.
- 66 -
Checking Flow
NO
Start
Check U102 Pin23
CELL_OUT
Refer to Graph4.2.1.4 (A)
Similar?
RFT Circuit is OK
See next page
YES
Check U102 I/Q Data
Pin27. 28, 29, 30
Refer to Graph4.2.1.4 (B)
Check U102 PWR
(+2.6V_MSMP2
+2.9V_TX)
NO
Check PMIC Circuit
Check U102 Pin1
(TX_ON Signal)
≥
2.5
NO
Check TX_ON
Signal Line &MSM
Check U102 Pin15
TCXO
Refer to Graph4.2.1.4(C)
Similar?
NO
Check TCXO Circuit
Check U102 Pin2, 3,4
SBCK0
SBDT0
SBST0
Refer to Graph4.2.1.4 (D)
YES
Similar
?
Replace U102
Check SBI Signal
LINE&MSM
Similar?
OK
NO
Check U201 MSM
NO
YES
YES
YES
+2.6V_MSMP2 PIN 32
+2.9V_TX PIN: 6,9,13,14,17,19,20,
22,24,25,31
Summary of Contents for PX8700
Page 40: ...PX8700 LG Electronics Inc 40 Circuit Diagram ...
Page 45: ...PX8700 LG Electronics Inc 45 Circuit ...
Page 51: ...PX8700 LG Electronics Inc 51 Circuit Diagram ...
Page 56: ...PX8700 LG Electronics Inc 56 Circuit ...
Page 62: ...PX8700 LG Electronics Inc 62 Circuit Diagram RFT6150 PMIC 2 9V_TX 2 6V_MSMP2 circuit ...
Page 70: ...PX8700 LG Electronics Inc 70 RF_IN Graph 4 2 1 6 RF_OUT Circuit Diagram Waveform ...
Page 84: ...PX8700 LG Electronics Inc 84 Graph 4 2 2 5 RF_OUT RF_IN Waveform Circuit Diagram ...
Page 90: ...4 3 1 2 Charging Trouble Circuit Diagram Test Points V_BATT Pin1 CON401 U402 ...
Page 98: ...4 3 4 2 Receiver Trouble Test Points Circuit Diagram R314 U305 R315 C338 ...
Page 100: ...4 3 4 4 Headset Trouble Circuit Diagram Test Points CON402 R405 R416 R415 C116 C115 ...
Page 103: ...4 3 4 3 Mic Trouble Circuit Diagram Test Points R126 M101 ...
Page 110: ...4 3 6 3 USB Interface Circuit Diagram U201 MSM6550 U302 Test Points R307 X202 R306 L302 C314 ...
Page 128: ......
Page 130: ...MSM6550 P N MSM6550 R N U201 No Booting Memory P N HYG0UGG0MF1P 5SH0E R N U304 No Booting ...
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Page 139: ...DCN Tx DCN Rx PCS Tx PCS Rx ...
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Page 147: ...D 1 Accessories 0 1 1 14 0 11 4 1 2 2 1 1 11 4 31 11 1 1 0 1 1 ...