IBM 19K1902 Service Manual page 11

4. USB NO OPERATING
CHECK
J106 PIN1?
YES
CHECK
L102, L103
?
YES
CHECK
U101 OUTPUT
(3.3V)?
YES
CHECK
X101?
YES
CHECK
U103?
YES
NO
NO
NO
NO
NO
- 11 -
TROUBLE IN
PC
TROUBLE IN
L102, L103
TROUBLE IN U101
TROUBLE IN X101
TROUBLE IN U103