How to enter the service mode, service mode adjustments, Philips, Magnavox, Sylvania and Emerson 40 inch LCD TVs -Troubleshooting -SMPS schematic

Electrical adjustments

Test Equipment Required

NTSC Pattern Generator (Color Bar W/White Window, Red Color, Dot Pattern, Gray Scale, Monoscope, Multi-Burst)

Remote control unit

Color Analyzer

How to set up the service mode

Turn the power on.
2. Press [MENU] button to display Setup menu.
3. Select “Features”.
4. Select “Current Software Info”.
5. Press [0], [4], [2], [5], [7], [4] and [Info] buttons on the remote control unit in this order. The following screen appears.

Purity Check Mode

This mode cycles through full-screen displays of red, green, blue, and white to check for non-active pixels.
1. Enter the Service mode.
2. Each time pressing [7] button on the remote control unit, the display changes.

3. To cancel or to exit from the Purity Check Mode, press [PREV CH] button.

Applicable to:

40” 40” 40” 40” 40” 40”

40MF430B/F7 40MF430B/F7 LC407SS1 LC407SS1 LC407SS1 LC407EM1

MAGNAVOX MAGNAVOX SYLVANIA SYLVANIA SYLVANIA EMERSON

(Serial No. : DS1A) (Serial No. : DS2A) (Serial No. : DS1A) (Serial No. : DS2A) (Serial No. : DS3A)

The White Balance Adjustment should be performed when replacing the LCD Panel or Digital Main CBA.

Symptom of Maladjustment: White becomes bluish or reddish.

Operate the unit for more than 20 minutes.
2. Input the White Raster (70%=70IRE, 40%=40IRE).

3. Set the color analyzer to the CHROMA mode and bring the optical receptor to the center on the LCD-Panel surface after zero point calibration as shown above.
Note: The optical receptor must be set perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press [VOLUME DOWN] button on the remote control unit and select “C/D” mode.

5. [CUTOFF]
Press [1] button to select “COR” for Red Cutoff adjustment. Press [3] button to select “COB” for Blue Cutoff adjustment.
[DRIVE]
Press [4] button to select “DR” for Red Drive adjustment. Press [6] button to select “DB” for Blue Drive adjustment.
6. In each color mode, press [CHANNEL UP/DOWN] buttons to adjust the values of color.
7. Adjust Cutoff and Drive so that the color temperature becomes 12000°K (x= 0.272 / y= 0.278 ±0.005).
8. To cancel or to exit from the White Balance Adjustment, press [PREV CH] button.

How to initialize the LCD TV

The purpose of initialization is to place the set in a new out of box condition. The customer will be prompted to select a language and program channels after the set has been initialized.
To put the program back at the factory-default, initialize the LCD TV using the following procedure.
1. Turn the power on.
2. Enter the service mode.
- To cancel the service mode, press [POWER] button on the remote control unit.
3. Press [INFO] button on the remote control unit to initialize the LCD television.
4. "INITIALIZED" will appear in the upper right of the screen. "INITIALIZED" color will change to green from red when initializing is completed.

Firmware renewal

Equipment Required
a. USB storage device
b. Remote Control Unit

[There are two states (the User Upgrade and the Factory Upgrade) in firmware update.]

User Upgrade > Upgrade the firmware only.  The setting values are not initialized.

Factory upgrade > Upgrade the firmware and initialize the setting values.

The identification of User Upgrade and Factory Upgrade are done by the filename.
1. Turn the power off and unplug the AC Cord.
2. Insert the USB storage device to the USB port as shown below.
The USB port “SERVICE TERMINAL” will be blocked by a cross shaped piece of plastic. Cutoff both end of the plastic connected to the PCB Holder as illustrated below.

3. Plug the AC cord in the wall outlet and turn the power on.

4. The update will start and the following will appear on the screen.

Note: If the screen isn’t displayed, repeat from step 1

5. When the firmware update is completed, the following will appear on the screen.

Remove the USB storage device from the USB port.
Turn the power off and turn the power on again.

[When the Factory Upgrade is used, after restarting TV, shift to initial screen menu in service mode. "INITIALIZED" will appear on the upper right of the screen. "INITIALIZED" color will change to green from red when initializing is completed.]

Troubleshooting table

SMPS [Power supply schematic]

Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.  If Main Fuse (F1601) is blown , check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.

Power Supply 1 Schematic Diagram

Power Supply 2 Schematic Diagram

Power Supply 3 Schematic Diagram