LG LM-M1030A, Service Manual

Page: 24 / 61

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