LG LM-M1030A, Service Manual

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