LG LM-M1030A Service Manual page 24

• MAIN SET
P-SENS PART
Does +5V appear at
ZD901(+)?
YES
Check the pattern of
IC301 Pin .
6
VKK PART
Does DC - 33V appear at
CN302 Pin .
28
NO
YES
Check the voltage of
IC301 pin87
Check the waveform
NO
of D913(+).
YES
Check R943 and replace
ZD901
Dose -33V appear at
ZD902(-)
NO
YES
Check Q903
TURN ON
NO
YES
Check the pattern
- 2-17 -
NO
Replace the ZD902
Check the -33V(Lower)
of C916(-)
NO
YES
Replace Q903
Refer to power circuit
Replace D913
Replace D912, D911
YES
NO
END