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LC-19LS410UT, LC-22LS510UT
CHAPTER 4.
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE(19" and 22")
↓
Are the power cord and harness in the unit properly connected?
↓ YES
LINE_FILTER_UNIT:
Is F901 and F902 normal?
↓YES
POWER_UNIT
Is BD901 (+320V) output? (Set the main power SW to OFF.)
↓YES
Is a voltage of +5V applied to pin (4,5) of connector (CN902)? (Set
the main power SW to OFF.)
↓YES
Are +16V output as for the power on/off switch when it is on?
Power unit operation check.
NO
Connect the power cord and harness properly, and turn on the
LINE_FILTER_UNIT:
Isn't L902, C908 etc. out of order? Moreover, whether the short-
circuit with the circumference circuit is checked.
NO
POWER_UNIT:
BD901, RV901,RV902,RV903, IC901, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit
is checked.
Does the AC in circuit normally?
NO
(F901,F902,L902,BD901 and etc. And, the circuit around the AC
in circuit etc. is checked.)
Does the switching circuit operate normally?
NO
Check circuit around the primary side (T901, IC901, C907, C937,
Q903 etc.), the secondary side (D905, L904,ZD902 etc.) the
STANDBY circuit (Q988, etc.), and the protection circuit.
Does the converter circuit operate normally?
NO
Check circuit around the primary side (T901, IC901, C907, C937,
Q903 etc.), the secondary side (D902, L903, ZD902 etc.), the
STANDBY circuit (Q988, etc.), and the protection circuit.
30
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