LG V9120W Service Manual page 16

(2) No 5.0V_D
No 5.0V_D
YES
NO
Is the Vcc(5.3V) sup-
plied to Q165 Emittor?
YES
NO
Is the Q162 Base
'H'?
YES
Check or Replace
the Q165
(4) No 3.3V
No 3.3V
YES
NO
Is there about 3.8V
at the IC131 pin1?
YES
NO
Is there about 3.3V~5V
at the IC131 pin4?
YES
Check the IC131
and Replace
Check or Replace
the D125
Check the PWR CTL
"H" signal from µ-com
Check or Replace
the D123
Check the PWR CTL
"H" signal from µ-com
3-5
(3) No 5.0V_T
No 5.0V_T
YES
NO
Is the Vcc(5.3V) sup-
plied to Q163 Emittor?
YES
NO
Is the Q162 Base
'H'?
YES
Check or Replace
the Q163
(5) No 33V
No 33V
YES
NO
Is the Vcc(33V) sup-
plied to Q161 Emittor?
YES
NO
Is the Q162 Base
'H'?
YES
Check or Replace
the Q161
Check or Replace
the D125
Check the PWR CTL
"H" signal from µ-com
Check or Replace
the D121
Check the PWR CTL
"H" signal from µ-com