2008-03-14
LC-19LE430E/UK, LC-22LE430E/UK, LC-26LE430E/UK, LC-32LE430E/UK
47
22" TROUBLESHOOTING TABLE
Power unit operation check.
LINE_FILTER_UNIT: YES
POWER_UNIT
YES
YES
YES
YES
YES
Are the power cord and harness in the unit properly connected? NO
Connect the power cord and harness properly, and turn on the
ower.
Is F9901/F9902 normal?
NO
LINE_FILTER_UNIT:
Isn't TH9901, L9902, FB9902, and FB9903 out of order?
Moreover, whether the short-circuit with the circumference circuit
is checked.
POWER_UNIT:
BD9901, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit
is checked.
Is (+18V) applied to pin (6) of IC9101 output? (Set the main power
SW to ON.)
Does the IC9101 circuit operate normally?
(D9103, IC9102, IC9101, Q9103 and etc. And, the circuit around
the protection circuit etc. is checked.)
NO
Is a voltage of +5.2V applied to pin (4,5) of connector (CN9102)?
(Set the main power SW to ON.)
Does the switching circuit operate normally?
Check circuit around the primary side (T9101, IC9101, D9101,
ZD9106, etc.), the secondary side (D9105, L9104, C9121, etc.)
NO
Are +16V output applied to pin (9, 10) of connector (CN9102) as for
the power on/off switch when it is on?
NO
Does the switching circuit operate normally?
Check circuit around the primary side (T9101, IC9101, D9101,
ZD9106, etc.), the secondary side (D9102, L9103, C9103, etc.),
and the protection circuit.
Similarly, is +16V & +5.2V output as for the power on/off switch
when it is on?
NO
Check IC9101 circuit of Q9103, T9101 etc.
Are +60V output as for the power on/off switch when it is on?
NO
Does the LED boost circuit operate normally?
Check circuit around the second side (L8501, IC8501, Q8501,
D8501 etc.)
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