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LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
32" TROUBLESHOOTING TABLE
Are the power cord and harness in the unit properly connected?
LINE_FILTER_UNIT:
Is F901/F902 normal?
POWER_UNIT
Is BD901 (+320V) output? (Set the main power SW to OFF.)
Is a voltage of +5V applied to pin (12,13) of connector (CN902)?
(Set the main power SW to OFF.)
Are +24V output as for the power on/off switch when it is on?
Are +60V output as for the power on/off switch when it is on?
Similarly, is +12V output as for the power on/off switch when it is
on?
Power unit operation check.
↓
↓ YES
↓YES
↓YES
↓YES
↓YES
↓YES
NO
Connect the power cord and harness properly, and turn on the
power.
LINE_FILTER_UNIT:
Isn't RV901,C901,L901,C904,C902,C903,L902,RV903, etc. out
of order? Moreover, whether the short-circuit with the
NO
circumference circuit is checked.
POWER_UNIT:
BD901, FB905, C910, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit
is checked.
NO
Does the PFC circuit operate normally?
(L906, Q901, D902, D903, IC901 and etc. And, the circuit around
the protection circuit etc. is checked.)
NO
Does the switching circuit operate normally?
Check circuit around the primary side (T901, IC931, Q931,
ZD931, ZD930, ZD980, ZD981, etc.), the secondary side (D935,
L980, etc.), the AC_DET circuit (IC932, IC982, etc.), and the
protection circuit.
Does the inverter circuit operate normally?
NO
Check circuit around the primary side (T902,Q951,Q952,IC951,
D951,D952, etc.), the secondary side (D955, C943, etc.), and the
protection circuit.
Does the inverter circuit operate normally?
NO
Check circuit around the second side (L907, Q991, D985, IC902,
Q903 etc.)
Check +12V circuit of D962, L931, etc.
NO
62
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