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Manuals
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LG Manuals
Cell Phone
U250
Service manual
Usb Troubleshooting - LG U250 Service Manual
Lg cell phone user manual
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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4. BB Trouble Shooting
4.11 USB Troubleshooting
USB Initial sequence of U250/KU250 is :
USB connected to U250/KU250 power on → USB_VBUS(Q300) go to 5V → USB_D+ go to 3.3V →
USB_DAT is triggered → USB work.
Power is on?
Cable is inserted?
Q400 pin 4 is 5V?
USB_D+ is 3.3V?
Change the Main board
Start
NO
YES
NO
YES
NO
YES
NO
YES
4. TROUBLE SHOOTING
Go to power on trouble shooting
Insert cable
Check Q300 (pin 4)
Check VA401
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Table of Contents
Troubleshooting
TROUBLE SHOOTING
72
Power ON Troubleshooting
93
Charger Troubleshooting
95
USB Troubleshooting
98
SIM Detect Troubleshooting
99
Camera Troubleshooting
101
Keypad Backlight Troubleshooting
104
Main LCD Troubleshooting
105
Troubleshooting Download Errors
128
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