Front Led Indicator Diagnostics - Mitsubishi Electric LT-37131 Service Manual

MODELS: LT-37131 / LT-37132 / LT-46131 / LT-46231
The front panel LEDs provide an indication of the sets operation, and the possible cause of a malfunction. There
are two front panel LEDs, "Power" and "Status." Which LED is lit, the color, and whether it is blinking or
steady indicate the current status, or a possible malfunction.
POWER LED Indicator
LED Color LED State
None Off
Blue Steady On
Blue Fast Blinking
Blue Slow Blinking
STATUS LED Indicator
LED Color LED State
None Off
Steady or
Red
Blinking
LED Diagnostics Error Code Check
Note: The TV must be in "Shut Down" and not manually switched Off, to perform the Error Code Opera-
tional Check. When the TV is switched Off, the code automatically resets to "12" No Error.
Press the front panel "INPUT" and "MENU" buttons at the same time, and hold for 5 seconds to
activate the Error Code Operational Check. The POWER LED will then flash denoting a two digit Code.
Note: The front panel buttons must be used, NOT those on the Remote Control.
•
The number of flashes indicates the value of the MSD (tens digit) of the Error Code.
•
The flashing then pauses for approximately 1/2 second.
•
The LED then flashes indicating the value of the LSD (ones digit) of the Error Code.
Example: If the Error Code is "32", the LED will flash three times, pause, and then flash two times.
•
The Error Code is repeated a total of 5 times.
Error Codes
The Error Code designations are listed in the following chart:
Error Code
12 No error detected since last Power On. PW B-POW ER
27 Inverter short is detected.
48 LCD Short is detected.
58 Signal Short is detected
59 DM short is detected

FRONT LED INDICATOR DIAGNOSTICS

POWER STATUS
TV Condition
TV is powered off.
TV is powered on.
1. TV just plugged into AC outlet.
2. AC just restored after power failure.
3. TV Rebooting after System Reset used.
4. TV Rebooting after power fluctuation or
receiving abnormal digital signals from digital
channel, CableCARD™, or digital device.
5. You have begun the procedure to update
software from an authorized flash memory
device. (May take 3-4 minutes).
TV powered off and auto-on timer is set.
TV Condition
Normal TV on or standby condition.
TV may require service.
De scription
Page 12
Additional Information
Normal operation.
Normal operation.
Wait until blinking stops
before turning on
(approximately 1 minute).
Normal operation. (If
blinking does not stop,
unplug set and re-apply
power. Or, press System
Reset.)
Normal operation. TV can
be turned on at any time.
Additional Information
Normal operation.
Perform LED Diagnostics
to obtain Error Code.
Most Like ly Ca use
PW B-INV 1-4 or LCD-MODULE
LCD-MODULE
PW B-SIGNAL
PW B-DM