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No power supply (Front LED does not light up) and no power-up even is turned on (Front LED light up to blue)
Is the AC cord connected?
Yes
Are the harness and Cable connected
properly?
Yes
Are F1 normal?
Yes
Is the voltage of C4 approx. 160V?
Yes
Are UR12V supplied?
Yes
Is 24V supplied?
Yes
Turn on the power again,and check if
the unit works normally.
Remarks
PS_ON
State of the set
(CN1
)
10
MODE1
High
STDBY
Low
MODE2
High
Power ON
TROUBLESHOOTING TABLE
No
Connect the AC cord and turn on the power.
No
Connect the hamess and Cable properly.
No
If the fuse is blown when turning on the power after replacing F1.replace Q1 and
PC1.
No
Check if L1,TH1 and BD1 are normal.
No
Does AC-CTRL (pin10 of CN1) become High (approx. 3.3V)?
Check the rectifier circuit of UR12V
No
Do the primary side and secondary side of T1/T1A oscillate normally?
Are D20 out of order?
UR12V
UR24V
(CN1
)
1
(CN2
1
)
12V
24V
-
-
24V
12V
Yes
Is the unit set to STANDBY MODE?
Is the main unit normal?
Yes
Are there defective parts on the pri-
mary side?Is the output on the Sec-
ondary side short-circuited?
31
LC-20D42U
No
No
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