LG LM-M530A/D/X Service Manual page 20

POWER CIRCUIT
Check the Fuse
YES
Check the DC output
of C901(+), C902(-)
YES
Check the DC Output of
C930(+)
YES
Check the Voltage
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 9, 10
YES
Replace the D706, D707,
D708, D709
NO
Check the IC901, IC902
Check the 5V of
NO
IC301 pin78
YES
Replace the IC904
NO
Check the "Low" of Q904"B"
YES
Check the Q904, CD Ass'y
- 2-13 -
NO
Check the power Ass'y or
NO
NO
NO
Check the IC501
Replace the Transformer
Check the power Ass'y
or Replace the
Transformer
Check the 5V of IC301
PIN13& PN302,
CN302, PIN13
Check the "High" of
IC501 pin 14
YES
NO
Check the HIGH of
Q905 "B" and Replace