Mitsubishi LT-55154 LT-40164 LT-46265 – LED blinking codes, Service mode, SMPS schematic, reset procedure LCD FLAT PANEL HDTV

VLP43 Chassis LT-55154
VLP43+ Chassis LT-40164 LT-46164 LT-55164
VLP43++ Chassis LT-46265 LT-55265

Click on the pictures to zoom in

SET SCREEN SIZE

The same PWB-MAIN is used for different screen sizes within a chassis family. When a PWB-MAIN is replaced, the screen size must be set up. Failure to setup the correct screen size will result in poor picture performance.

1. Press the <MENU> <2-4-5-7> buttons.
The Service Menu will appear.

2. Press the <0> button.
The Data Selection Menu will appear.

3. Use the <Up|Dn> buttons to select “SET SCREEN SIZE” and press <ENTER>.

4. Use the <Up|Dn> buttons to toggle to select the correct screen size and chassis of the model being serviced.

5. Press <ENTER>.

6. The Screen Size indication will flash Red momentarily to indicate the selection has been saved. Press <EXIT> or <MENU> to exit.

Screen Size Menu

<MENU> <2-4-7-0> <0> “SELECT SCREEN SIZE”

SELF DIAGNOSTICS
A blinking red and yellow Status LED will indicate an Error Code that can help determine the cause of a circuit failure.
> The number of Red blinks indicates the value of the MSD (tens digit) of the Error Code.
> The number of Yellow blinks indicates the value of the LSD (ones digit) of the Error Code.
Example: If the Error Code is “27”, the LED will continuously blink Red two times, followed by blinking Yellow seven times.

To perform a System Reset, press and hold the side Power button for 10 seconds. Or, unplug the set for 10 seconds then restore power.

Error Codes, descriptions and the most likely cause of failure are listed below:

The Error Code Log may be helpful to retrieve the code for an error that occurred in the past. To access the Error Code Log: Press <MENU> <3-5-6-4>

The Error Code Log is intended as a reference tool and is not meant to be used as a final determination

of a defective part.

SOUND PROJECTOR TRANSDUCER TEST
This procedure will test will each of the TV’s speakers individually using an internal white noise generator.
1. Press the <MENU> button on the remote control. The Customer Menu will appear.
2. Press the <2-4-5-7> buttons. The Service Menu will appear.
3. Press the <0> button. The Data Selection Menu will appear. See below.

4. Use the <Up/Dn> buttons to select “SOUND PROJECTOR TRANSDUCER TEST” and press <ENTER>. The
Sound Projector Transducer Test Menu will be displayed. A tone will automatically cycle from one speaker to the next as indicated on screen. Follow the instructions to manually cycle the tone.
5. Press <EXIT> or <MENU> to exit.
NOTE: The VLP43 chassis has 12 speakers. The menu will show 16 speakers with 4 grayed out.
The VLP43++ chassis includes left and right full range speakers.

SMPS [Power supply board] circuit diagram

RESET | INITIALIZATION

Many customer generated symptoms, intermittent symptoms or no symptom found can be resolved by using the various Reset and Initialization options. Before visiting the customer’s home ask the customer 1st perform a System Reset by pressing the <POWER> button on the front panel and holding it for 8 seconds. If this does not resolve the issue, they can perform an A/V Reset by pressing the <INPUT> + <VOL DN> buttons on the front panel at the same time and holding for 10 seconds. Then, if necessary, perform a user level Initialization by pressing <MENU><1-2-3> <ENTER> with the remote. The customer should be made aware when settings and/or options will be reset. For more information, see the chart below

BACKUP | RESTORE ISF SETTING

VLP43+ and VLP43++ models - If the customer has calibrated the ISF (ADV) video settings, the settings data
can be backed up on a USB memory device. If the settings are lost due to a Reset or Initialization procedure,
PWB-MAIN replacement or other reasons, the settings data can be restored.
Backup ISF Settings.
1. Insert a empty USB memory device into the USB slot.
2. Press the <MENU> button on the remote control. The Customer Menu will appear.
3. Press the <2-4-5-7> buttons. The Service Menu will appear.
4. Press the <0> button. The Data Selection Menu will appear.

5. Use the <TS> buttons to select “BACKUP AND RESTORE ISF SETTING” and press <ENTER>.
6 Use the <Up/Dn> buttons to toggle to "Backup ISF Settings to USB” (Default).

7. While "Backup ISF Settings to USB” is displayed, press <ENTER>. The screen will flash the message "Backup completed."

Restore ISF Settings.

1. Insert the USB memory device with the backup data into the USB slot.

2. Press the <MENU> button on the remote control. The Customer Menu will appear.

3. Press the <2-4-5-7> buttons. The Service Menu will appear.

4. Press the <0> button. The Data Selection Menu will appear. See above.

5. Use the <Up|Dn> buttons to select “BACKUP AND RESTORE ISF SETTING” and press <ENTER>.

6. Use the <Up\Dn> buttons to toggle to “Restore ISF Settings From USB.”

WARNING: DO NOT press <ENTER> while "Backup ISF Settings to USB" is displayed. The data on the USB will be overwritten and lost.