Mitsubishi Electric LT-2220 Service Manual page 38

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050
(2)Flashing in green.
Is the back-light on?
YES
Skip to "2. No picture
displayed and picture
errors."
(3)Flashing in Amber.
If POWER switch is
pushed, does LED
become green?
YES
Skip to the above-mentioned
"(2) Flashing in green" .
NO
Is the following harness connected?
-Between PWB-SUB(SET) and
INVERTER (J821-INVERTER)
-Between back-lights and
INVERTER
Is the INV-SW output 5V-level
at Pin12 of the J821 connector?
(PH connector)
Is the BRIGHT output about 5V
level at Pin14 of the J821
connector? (PH connector)
Inverter or back-light of LCD-
panel are out of order.
NO
IC300 and peripheral circuits
are out of order.(PWB-MAIN)
NO
Poor harness connection.
YES
NO
IC300 and peripheral circuits
are out of order.(PWB-MAIN)
YES
NO
IC300 and peripheral circuits
are out of order.(PWB-MAIN)
YES