LG LST-5600A Service Manual page 12

No 5VA
YES
NO
Is there about 5.5V
at the IC153 pin1?
YES
Check or Replace
the IC153
No 12VA
YES
NO
Is there about 14V
at the IC151 pin1?
YES
Check or Replace
the IC153
Check or Replace
the D124
Check or Replace
the D129
3-3
No 30VA
YES
NO
Is the ZD152
Normal?
YES
Check or Replace
the D126
Replace the ZD152
(Use the same Value)