LG 32LB9D - Usb; Block Diagram for EMF; Check Sequence; Exception

LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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1. Block Diagram For EMF
Check t he device power LED
Check t he device Cable.
Is it USB1.1 cable?
If the device is HDD, check a
external po wer adaptor.
Check V BUS_5V
Check t he DC/DC Converter
(IC712)
N
Y
Y
N
N
2. Check Sequence
Replace the cable to USB1.1 cable
or Replace the device.
Y
N
Replace the DC/DC Converter
(IC712)
Exception
- USB power could b e disabled by inru shi ng curre nt
- In th is case , remo ve the de vice and try to rebo ot the TV (AC pow er off/on )
X260
USB_ link
(IC101)
DC/DC Conv erter
(IC712)
J
A
C
K
Side B/D
USB1.1_OVRCUR
5V_USB
VBUS_5V
DP,DM
Cable
USB_PWR_DOWN
DEVICE
(HDD or Memor y)
USB 1.1 cable
3. USB