Mitsubishi Electric LT-3280 Service Manual page 36

(A) In case of the POWER-LED blinking. (A) In case of the POWER-LED blinking. (A) In case of the POWER-LED blinking. (A) In case of the POWER-LED blinking. (A) In case of the POWER-LED blinking.
☆Short1 mode: The POWER-LED blinking is 1 time within a cycle.
CN1 and CN2 harness are removed.
Connect the Power plug again and turn on the main Power switch
(Front switch or remote switch).
Is the POWER-LED still blinking?
Pcba-POWER-SUB1 is out of order.(Only LT-3780D)
Pcba-POWER-SUB2 is out of order.(Only LT-3280D)
☆Short2 mode: The POWER-LED blinking is 2 times within a cycle.
Confirm the following fuses. Repair the broken fuse.
Parts No. Rated value
F9G5 1.6A
F9G6 1A
F9G7 4A
F9G8 0.5A
PD and PE harness are removed after the broken fuse is repaired.
Connect the power plug again.
Is the voltage of 4.5V, AMPVCC(17V),P5V(only LT-3280D) and 18V(only LT-
3780D) output available?
YES
PD and PE harness are connected after the power plug is
removed.
CNF1(only32") or CNF2(only37") harness is removed.
Connect the power plug again and turn on the main
Power switch (Front switch or remote switch).
Is the voltage of 4.5V, AMPVCC(17V),P5V(only LT-
3280D) and 18V(only LT-3780D) output available?
MODELS: LT-3280D/LT-3780D
YES
The inverter circuit of LCD- panel is out of order.
Output
AMPVCC(17V)
P5V(only 32")
18V(only 37")
4.5V
Page 36
NO
Measurement part
Cathode of D9H5.
Cathode of D9J9.
Cathode of D9J2.
Cathode of D9H5.
NO
Pcba-POWER is out of order.
YES
The circuit of LCD-panel is
out of order.
NO
Pcba-MAIN is out of order.