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19
3-1-4. NO POWER: DC/DC converter check
Troubleshooting
START
IC9106
output or
input short
to GND?
C9302,
C9214
Other part in
+5.0V_VBUS line or
19.5V_SS line
broken.
Remove
IC9106.
Still short?
IC9106 broken
IC9101
output or
input short
to GND?
SL9104,
C9114
Other part in
+5.0V_MAIN line or
19.5V_SS line
broken.
Remove
IC9101.
Still short?
IC9101 broken
Q9108
output or
input short
to GND?
SL9110,
C9158
Other part in D+1.0V
line or +5.0V_MAIN
line broken. (AYU2L
maybe broken)
Remove
Q9108. Still
short?
Q9108 broken
IC9103
output or
input short
to GND?
SL9110,
C9147
Other part in D+1.0V
line or +5.0V_MAIN
line broken. (AYU2L
maybe broken)
Remove
IC9103.
Still short?
IC9103 broken
IC9104
output or
input short to
GND?
SL9107,
C9155
Other part in
+3.3V_MAIN_1 line
or +5.0V_MAIN line
or +5.0V_MAIN line
broken.
Remove
IC9104.
Still
short?
IC9104 broken
IC9105
output or
input short
to GND?
SL9108,
C9163
Other part in D+1.1V
line or +5.0V_MAIN
line broken.
Remove
IC9105.
Still short?
IC9105 broken
SHEET 2
YES
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
CONDITION
SYMPTOM
19.5V_SS
not available.
Board will not turn ON.
No blinking.
STBY_+3.3V, STBY_+1.8V
and
STBY_+1.0V
not
available.
Board will not turn ON.
No blinking.
19.5V_HOLD
not available.
2X blinking.
+5.0V_MAIN
not available.
2X blinking.
D+1.0V, +5.0V_VBUS, +3.3V_MAIN_1,
DDR3_+1.5V
DDR3_+1.5V
or
+1.8V_MAIN
not available.
3X blinking.
D+1.1V
not available.
Board turn ON. No blinking at first, but after
few minutes (±5min)
few minutes (±5min)
8X blinking occur.
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