Table of Contents
Advertisement
CHAPTER 4.
TROUBLESHOOTING TABLE
[1] 22" TROUBLESHOOTING TABLE
↓
Are the power cord and harness in the unit properly connected?
↓ YES
LINE_FILTER_UNIT:
Is F901 F902 normal?
↓YES
POWER_UNIT
Is BD901 (+320V) output?
↓YES
Is a voltage of +5.3V applied to pin (4,5) of connector (CN902)?
↓YES
Is a voltage of +16V applied to pin (9,10) of connector (CN902)?
LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
Power unit operation check.
2008-03-14
NO
Connect the power cord and harness properly, and turn on the
power.
LINE_FILTER_UNIT:
Isn't C908, RV901, L902, C900, C901, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit
NO
is checked.
NO
Does the circuit operate normally?
Check circuit around (BD901, Q903, ZD906, IC901, D901 etc ).
NO
Does the switching circuit operate normally?
Check circuit around the primary side (T901, ZD906, D901,
D903, Q903, D904, IC901, Q901, D904 etc.), the secondary side
(D905, L904, C921 etc.), the DC_DET circuit (IC902, ZD903,
IC903, IC901, etc.), and the protection circuit.
Does the inverter circuit operate normally?
NO
Check circuit around (D902, L903, C914, Q908, ZD902 etc.), and
the protection circuit.
37
Hide quick links:
Advertisement
Table of Contents
