No Power: Dc/Dc Converter Check - Sony KJ-32W7 C Series Service Manual

Troubleshooting

3-1-4. NO POWER: DC/DC converter check

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