Samsung Electronics
4-9
Troubleshooting
USB doesn’t work
Does USB CABLE work
normally?
USB_5V(JJ02)
Comes out?
USB_DET
Comes out?
Is USB
signal out
of IC907-1/2pin
Repair is done
Replace USB CABLE
Check RJ07/RJ08
Check RJ09/RJ0
No
Yes
No
No
No
Check JJ02 pin=5V
Are DP/DM
of IC907-8/7pin
Level = 0.5V ?
Check IC907-0pin(VCC),
9pin(0V)
No
Does the
Clock of ICD0 Work nor-
mally? XD02= 12MHz
Check XD02
No
Does
ICD0(NIKE)
Work normally?
Replace ICD0 or Main B’d
No
Yes
Yes
Yes
Yes
Yes
Yes
Does it
work normally
After having Image
Upgrade?
Replace ICD0 or Main B’d\
No
Yes
Refer to a pattern
image of Fig 4-14,15
Refer to a pattern
image of Fig 4-14,15
Refer to a pattern
image of Fig 4-14,15
Refer to a pattern
image of Fig 4-14,15
