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LC-26DA5U
LC-32DA5U
Power supply>
No power supply (Front LED does not light up) and no power-up even if the power is turned on (Front LED does not change from red to green)
Is the power supply cord properly connected to the main unit?
YES
Are the wire harness, FFC, etc. in the set connected properly?
YES
Are F701 and F702 normal?
YES
Is a voltage generated at the BU5V and BU15V lines?
YES
Is a voltage of approx. 380V generated at C711(32DA5U only)
C712/C713 when the power is supplied?
YES
Is a voltage generated at the UR13V, 35V and 24V lines immediately after
the power is supplied?
YES
Is a voltage generated at BS10V and 10V?
YES
Is each DC/DC converter output normal?
YES
Replace each DC/DC converter, and check peripheral circuits and each
line.
1) 3.3V (IC802)
2) UR6V (IC803)
3) PNL5V (IC805)
TROUBLESHOOTING TABLE
NO
NO
NO
NO
NO
NO
NO
NO
Reconnect the power supply cord and turn on the power.
Reconnect the wire harness, FFC, etc. and check again
If the fuse is blown when turning on the power after replacing F701 and
F702, replace VA701-VA703, D701, L703, Q701-Q705, and IC701, and
recheck.
Are there defective parts or short-circuited circuits on the BU5V and
BU15V lines?
YES
Remove the broken part or short-
circuit and check again.
Check the power supply circuit of the 380V system (L703, IC701, IC702,
Q701-706, D705, D707-710, R718, R719, T701, 703, 704, Q707-Q721).
Check the power supply circuits of the UR13V, 35V and 24V systems
(T701, T703(32DA5U only),T704, Q707-721, PC702-704, PC706, D711-
733, D742, Q801, Q802, Q803(32DA5U only)Q804, Q805, Q810-814,
IC801, IC804, L801, L804, D801-804, D817, D819, D820, D842, D843).
Check the power supply circuits of BS10V and 10V.
Check the oscillator side for each DC/DC converter and rectifier
side on the secondary side.
32
.
NO
Check the power supply circuit of the
BU5V and BU15V system (D734-741,
IC703, T706, PC706, D828-832,
IC806, L808).
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