Asus A68 TROUBLESHOOTING GUIDE
ASUS A68
RF Hardware Trouble Shooting Guide
PMD-HW2
Inspiring Innovation．Persistent Perfection
Outline
(*) Debug Tool Required
• Repair and Test Environment
• RF Block Diagram
• RF Calibration Repair Guide
– GSM Quad-bands Block Diagram
– GSM EGSM and GSM850
– GSM DCS and PCS
– WCDMA/LTE Block Diagram
– WCDMA/LTE Diversity Block Diagram
– Transceiver
– RF Trouble Shooting
(*)
• GPS Repair Guide
• BT/WiFi Repair Guide
(*)
• FM Repair Guide
• P03 Antenna Repair Guide
Inspiring Innovation．Persistent Perfection
Outline
(*) Debug Tool Required
• Repair and Test Environment
• RF Block Diagram
• RF Calibration Repair Guide
– GSM Quad-bands Block Diagram
– GSM EGSM and GSM850
– GSM DCS and PCS
– WCDMA/LTE Block Diagram
– WCDMA/LTE Diversity Block Diagram
– Transceiver
– RF Trouble Shooting
(*)
• GPS Repair Guide
• BT/WiFi Repair Guide
(*)
• FM Repair Guide
• P03 Antenna Repair Guide
Inspiring Innovation．Persistent Perfection
Repair and Test Environment - Antenna position
Div.
WiFi
GPS
GPS
Mylar
Div
Main
cable
WiFi
GPS
Div.
cable
Main
Main
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Repair and Test Environment
Spectrum
Analyzer
Multi-meter
PC with Debug Tool
RF
Probe
Power Supply
(4.0V)
Fixture
USB Calbe
USB contact
Power Supply
contact
RF Cable
DUT
(*)
(*)
Inspiring Innovation．Persistent Perfection
Outline
(*) Debug Tool Required
• Repair and Test Environment
• RF Block Diagram
• RF Calibration Repair Guide
– GSM Quad-bands Block Diagram
– GSM EGSM and GSM850
– GSM DCS and PCS
– WCDMA/LTE Block Diagram
– WCDMA/LTE Diversity Block Diagram
– Transceiver
– RF Test Trouble Shooting
(*)
• GPS Repair Guide
• BT/WiFi Repair Guide
(*)
• FM Repair Guide
• P03 Antenna Repair Guide
Inspiring Innovation．Persistent Perfection
RF Block Diagram
BT/WiFi
Antenna
BT/WiFi
GPS
GPS
Antenna
GSM Tx
Quad-Band
Ant. SW
GSM
Rx
Transceiver
&
Receive Path
Main
Antenna
UMTS
LTE
Rx
WCDMA
Band1/8
LTE
Band3/7/20
TX
Diversity
Antenna
SP5T
UMTS / LTE
DRx
FM
APQ8604//PM8921
MDM9215M/PM8018
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A68 RF Areas Top Side
GPS
TOP
TOP
RF
Inspiring Innovation．Persistent Perfection
A68 RF Areas Bottom Side
WiFi/BT
Ant. Spring
Div.
Ant. Spring
RF
BOT
WiFi/BT
GPS Ant. Spring
FM
Main Ant.
Connector
RF
BOT
P03 Div. Ant.
Connector
Inspiring Innovation．Persistent Perfection
Key components locations(Top)
MMPA
RF Switch
GSM Quad-bands
WCDMA B1/B8
LTE
Band20
DC/DC
B8
Transceiver
Duplexer
SAW Filter
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Key components locations(Bottom)
B7
B3
B1
LTE
Band7
LTE
Band3
B20
RF Switch
Duplexer
SAW Filter
Inspiring Innovation．Persistent Perfection
Outline
(*) Debug Tool Required
• Repair and Test Environment
• RF Block Diagram
• RF Calibration Repair Guide
– GSM Quad-bands Block Diagram
– GSM EGSM and GSM850
– GSM DCS and PCS
– WCDMA/LTE Block Diagram
– WCDMA/LTE Diversity Block Diagram
– Transceiver
– RF Test Trouble Shooting
(*)
• GPS Repair Guide
• BT/WiFi Repair Guide
(*)
• FM Repair Guide
• P03 Antenna Repair Guide
Inspiring Innovation．Persistent Perfection
GSM Block Diagram
RF8889A
(ASM)
U4401
Main Ant.
TQM7M9023
(MMPA)
U4601
Rx SAW
WTR1605L
(Transceiver)
U4501
MDM9215M
PM8018
(PMIC)
Inspiring Innovation．Persistent Perfection
Antenna Switch(U4601) ─ RF8889A
Test point locations
1. VC1 : C4407.1 (1.8V/0V) 9. Rx1 : C4811.1
2. VC2 : C4406.1 (1.8V/0V) 10. Rx2 : C4812.1
3. VC3 : C4405.1 (1.8V/0V) 11. Rx3 : C4815.1
4. VC4 : C4404.1 (1.8V/0V) 12. TRx4 : C4624.1
12
6
Control pin
U4601
Power pin
Signal pin
5 1 2 3 4
9
10
11
5. VDD : C4403.1 (2.85V)
6. ANT : L4401.1
7. TX1 : C4619.1
8. TX2 : C4605.1
8
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7
DC-DC Converter(U5201) ─ LM3243
The LM3243 is a DC-DC converter optimized for powering RF PA.
V_APT : controlled voltage by MDM9215M for PA depend on Tx output power
Test point locations
1. BP : None
2. MODE : C5207.1 (1.8V/0V)
3. EN : C5208.1 (1.8V/0V)
4. VCON : C5209.1 (1.8V/0V)
5. PVIN1 : C5202.1 (3.8V)
6. PVIN2 : C5202.1 (3.8V)
7. VDD : C5202.1 (3.8V)
8. ACB1 : C5206.1 (V_APT)
9. ACB2 : C5206.1 (V_APT)
Control pin
1
3
5
6
7
2
Power pin
Feedback pin
Power Output pin
8
9
10
11
12
10. FB : C5206.1 (V_APT)
11. SW1 : L5201.1
12. SW2 : L5201.1
4
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DC/DC Converter Power Domain
Shunt Capacitors
without orientation
1. U5201: DC-DC Converter
LM3243
2. C5201.1: 10uF (3.8V)
3. C5206.1: 10uF (V_APT
2
DC/DC
3
1
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MMPA(U4601)
─ TQM7M9023
Control pin
Power pin
Signal pin
Test point locations
U4601
1. GSM_IN: C4623.1
2. GSM_OUT : L4608.2
3. DCS/PCS_IN : C4607.1
4. DCS/PCS_OUT : C4602.2
5. VCC_GSM : C4617.1 (V_APT)
6. VBATT : C4616.1 (V_APT)
7. LB_EN : C4622.1 (1.8V/0V)
8. HB_EN : C4612.1 (1.8V/0V)
9. MODE : C4615.1 (1.8V/0V)
10. VMODE0 : C4614.1 (1.8V/0V)
11. VMODE1 : C4613.1 (1.8V/0V)
4
5
2
3
8
10
11
9
6
7
1
Inspiring Innovation．Persistent Perfection
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