27
LC-26D43U
TROUBLESHOOTING TABLE
No power supply (Front LED does not light up) and no power-up even is turned on (Front LED light up to blue)
Yes
No
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Is the unit set to STANDBY MODE?
Is the main unit normal?
Yes
No
Yes
No
Yes
No
Yes
Check the regulator circuit of BU5V,
rectifier circuit of UR12V and RL701.
Does PS_ON (pin10 of CN802) become High (approx. 3.3V)?
Are F703,TH703,D734-D737 and
IC703 out of order?
Are there defective parts on the
primary side?Is the output on the
secondary side short-circuited?
Do the primary side and secondary side of T701 oscillate normally?
Check if VA701,VA702,VA703,D701,R703,R704,R705 and RL701 are normal.
If the fuse is blown when turning on the power after replacing F701.replace
IC703 ,Q715 and Q716.
Connect the hamess and FFC properly.
Connect the AC cord and turn on the power.
Is the AC cord connected?
Are the harness and FFC connected
properly?
Is the voltage of C748/C773/C775
approx. 160V?
Is BU5V supplide?
Are F701 normal?
Are UR12V supplied?
Is 24V supplied?
Do the primary side and secondary side of T701 oscillate normally?
Are D824 out of order?
Are there defective parts on the pri-
mary side?Is the output on the Sec-
ondary side short-circuited?
Turn on the power again,and check if
the unit works normally.
Remarks
State of the set
STDBY
MODE1
MODE2
Power ON
(CN802 )
PS_ON
(CN802 )
BU5V
(CN802 )
UR24V
(CN801 1 )
UR12V
(CN802 )
High
High
Low
5V
5V
5V
12V
12V
24V
24V
--
10
1
-
-
-
1110
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