LG BD370 - Page 44

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