JVC XV-BP1B Service Manual page 44

ELECTRICAL TROUBLESHOOTING GUIDE
No 3.3V
YES
Is the
NO
Vcc(3.8V)
supplied to IC153
Pin1?
YES
NO
Is the
IC153 Pin4
"H"?
YES
Check or Replace
the IC153
No 12V_A
YES
Is the
NO
Vcc(13.5V)
supplied to IC151
Pin1?
YES
NO
Is the
IC151 Pin4
"H"?
YES
Check or Replace
the IC151
Check or Replace
the D123
Check the DVD CTL
"H" signal from µ-com
Check or Replace
the D121
Check the DVD CTL
"H" signal from µ-com
3-31
No 5V
YES
Is the
NO
Vcc(5.5V)
supplied to D132
anode?
YES
NO
Is the
IC152 Pin4
"H"?
YES
Check or Replace
the IC152
No 12V_L
YES
Is the
NO
Vcc(13.5V)
supplied to IC154
Pin1?
YES
NO
Is the
IC154 Pin4
"H"?
YES
Check or Replace
the IC154
Check or Replace
the D132
Check the DVD CTL
"H" signal from µ-com
Check or Replace
the D121
Check the DVD CTL
"H" signal from µ-com