Sharp LC-19LE430E Service Manual page 48

LC-19LE430E/UK, LC-22LE430E/UK, LC-26LE430E/UK, LC-32LE430E/UK
26" TROUBLESHOOTING TABLE
↓
Are the power cord and harness in the unit properly connected?
↓ YES
LINE_FILTER_UNIT:
Is F9901/F9902 normal?
↓YES
POWER_UNIT
Is (+20V) applied to pin (6) of IC9101 output? (Set the main power
SW to ON.)
↓YES
Is a voltage of +5.2V applied to pin (1, 3) of connector (CN9105)?
(Set the main power SW to ON.)
↓YES
Are +24V output applied to pin (5, 6) of connector (CN9105) as for
the power on/off switch when it is on?
↓YES
Similarly, is +12V 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
power.
LINE_FILTER_UNIT:
Isn't NR9901, L9903, L9905, FB9902, and FB9903 out of order?
Moreover, whether the short-circuit with the circumference circuit
NO
is checked.
POWER_UNIT:
BD9901, FB9901 etc. out of order?
Moreover, whether the short-circuit with the circumference circuit
is checked.
Does the IC9101 circuit operate normally?
NO
(D9105, IC9102, IC9101, Q9105 and etc. And, the circuit around
the protection circuit etc. is checked.)
Does the switching circuit operate normally?
NO
Check circuit around the primary side (T9101, IC9101, D9105,
D9102 etc.), the secondary side (D9103, L9102, C9110, etc.)
Does the switching circuit operate normally?
NO
Check circuit around the primary side (T9101, IC9101, D9105,
D9102, etc.), the secondary side (D9101, L9101, C9107, etc.),
and the protection circuit.
Check IC9401 circuit of D9402, L9401 etc.
NO
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