LG LM-M1030A Service Manual page 25

Power Circuit
Check the Fuse
YES
Check the DC output
of C901(+), C951(-)
YES
Check the DC Output of
C903(+)
YES
Check the output of
IC901, IC902
YES
Check the DC 12V
Output of IC903
YES
Check the 5V of CN513
pin 7 (CD FUNCTION)
YES
END
NO
Replace the Fuse
NO
Check the AC Output of
CN901 pin1, 5
YES
Replace the D901, D902,
D903, D904
NO
Check the AC Output of
CN701 PIN 1, 9, 10
NO
Check the IC901, IC902
Check the "5V" of
NO
IC501 pin5
YES
Replace IC904
NO
Check the "Low" of Q904 "B"
YES
Replace Q904
- 2-18 -
NO
Replace the Transformer
NO
Replace the Transformer
NO
Check the 5V of IC301 or
check PN301/CN302 pin3
NO
Check the "HIGH" of
IC501 pin 14
NO
Check the IC501
YES
and Replace
Check the "HIGH" of
Q905 "B"