ASUS Z170MG Service Manual
ASUS Z170MG MB Service Manual
Content
I. Baseband Troubleshooting Guide
1. System Block Diagram
2. Power Block Diagram
3. Power Domain and Power Sequence
II. MB Trouble Shooting Guide
1. Outline and Component Introduction .....................................................................................Error! Bookmark not defined.
2. Cannot power on.....................................................................................................................Error! Bookmark not defined.
3. Blank screen.............................................................................................................................Error! Bookmark not defined.
4. LCD display failure ...................................................................................................................Error! Bookmark not defined.
5. TP does not work.....................................................................................................................Error! Bookmark not defined.
6. Gravity sensor failure...............................................................................................................Error! Bookmark not defined.
7. Side key FPC failure..................................................................................................................Error! Bookmark not defined.
8. Cannot get charged, fail to identify USB..................................................................................Error! Bookmark not defined.
9. Rear camera function failure ...................................................................................................Error! Bookmark not defined.
10. Front camera function failure ..............................................................................................Error! Bookmark not defined.
11. Motor fault ............................................................................................................................Error! Bookmark not defined.
12. GSM network failure..............................................................................................................Error! Bookmark not defined.
13. WCDMA network failure ....................................................................................................... Error! Bookmark not defined.
14. WIFI/ BT failure......................................................................................................................Error! Bookmark not defined.
15. GPS failure ............................................................................................................................. Error! Bookmark not defined.
16. FM failure...............................................................................................................................Error! Bookmark not defined.
17. Fail to identify earphone/Handset MIC failure......................................................................Error! Bookmark not defined.
18. MIC no sound/small sound....................................................................................................Error! Bookmark not defined.
19. Receiver no sound ................................................................................................................. Error! Bookmark not defined.
20. Speaker no sound .................................................................................................................. Error! Bookmark not defined.
21. Fail to identify SIM card.........................................................................................................Error! Bookmark not defined.
22. Fail to identify T-flash card..................................................................................................... Error! Bookmark not defined.
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I. Baseband Trouble Shooting Guide
1. System Block Diagram
2. Power Block Diagram
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3. Power Domain and Power Sequence
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II. MB Trouble Shooting Guide
1. Outline and Component Introduction
CTP connector
Front camera
connector
GSM RF
power amplifier
RF module
Rear camera
connector
Side key FPC
connector
26M crystal
oscillator
Battery connector
PMIC
MT6627
WIFI/BT/GPS/FM IC
CPU
FLASH
LED driver
SIM card socket
T-flash card
socket
LCD connector
Motor connector
USB
MIC
GPS\WIFI ANT
Earphone socket
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2. Cannot power on
Solution:
1 Check if the battery connector and its soldering are oxidized or damaged
2 Check if the following voltage, and GND has short circuit or abnormal voltage
VBAT 3.8--4.2V
VCORE 0.7--1.4V
VSYS 1.825/2.2V
VPA O.5-3.4V
VTXCO 2.8V
VA 2.8V
VCAMA 2.8V
VCN28 2.8V
VCAMA 2.8V
VUSB 3.3V
VEMC_3V3 3.3V
3 Check if start-up circuit is abnormal
4 If the start-up circuit is about 20 MA, check if the soldering of crystal oscillator circuit is normal
5 For those start-up current abnormally above 1A, check if VBAT circuit is shorted to ground, investigate each
locations’grounding diodes and other key components
6 For those start-up current abnormally around 100MA, touch if there is any heating part on MB and focus on
their investigation
7 X-ray: check each main chip’s soldering, CPU/Flash/PMIC(MT6323GA)
8 Add soldering or re-solder each main chip and confirm again
9 Replace CPU/Flash/PMIC
CPU MT8382
Flash
PMIC
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3. Blank screen
Solution:
1 Check if the backlight chip -- U815 driver chip has soldering deviation
2 Check the LCD connector’s assembly is normal, if not please re-assemble
3 Check if L801’s conduction is normal, and compare it to L1901 voltage on normal MB
4 Check if D803’s conduction is normal or the component’s soldering is reverse
5 Check if GPIO_FLASH_EN’s signal is normal, and adjust this signal’s backlight brightness
6 Check if VBAT’s power supply is normal
4. LCD display failure
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Solution:
1 Re-assembly LCD or replace LCD, then reboot again to observe
2 Check if LCD and its soldering is abnormal
3 Check if LCD filter (Z801—Z805) is poorly soldered or damaged
4 X-ray: check if CPU’s soldering is abnormal
5 Add soldering or re-solder CPU, or replace it
5. TP does not work
Solution:
1 Re-assemble or replace the CTP, then reboot to test again
2 Check if the CTP connector (J802) or its soldering is abnormal, re-solder or replace it to test again
3 Measure if VIO18_PMU’ voltage is normal
4 X-ray: check CPU’s soldering, add soldering or re-solder it to test again
5 Use a multi-meter to measure CTP test signal point, compare its ground resistance with normal MB’s
6 Replace CPU
Backlight
driver chip
L901
Z801—Z805
CPU
LCD connector
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