Thursday, January 07, 2016

MAGNAVOX 19MD350B/F7 Service mode - Initialization and firmware update - LCD tv repair

Category: LCD Television Service and repair 

Contents of this article 

  • How to enter to service mode 
  • How to initialize 
  • Firmware update 





MAGNAVOX 19MD350B


How to set up the service mode
Service mode:
1. Use the service remote control unit.
2. Turn the power on.
3. Press the service button on the service remote control unit.
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 service
remote control unit, the display changes
1. Operate the unit for more than 20 minutes.
2. Set the color analyzer 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.
3. Enter the Service mode.
4. Press [3] button on the service remote control unit.
5. Press [CHANNEL UP/DOWN] buttons on the service remote control unit so that the color analyzer value becomes minimum.
White Balance Adjustment
Purpose: To mix red, green and blue beams correctly for pure white.
Symptom of Misadjustment: White becomes bluish or reddish
1. 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
Note: The optical receptor must be set perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press [VOLUME DOWN] button on the service remote control unit and select “C/D” mode.
HOW TO INITIALIZE 
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/DVD using the following procedure.
DVD Section 
1. Turn the power on.
2. To enter the service mode, press the service button on the service remote control unit.
- To cancel the service mode, press [POWER] button on the service remote control unit.
3. To put the LCD TV/DVD into the DVD mode, press [CH RETURN] or [PREV CH] on the remote control unit.
4. To put the LCD TV/DVD into the Flash clear mode, press [INPUT SELECT] or [SOUCE] buttons on the remote control unit in that order within five seconds.
When “OK” appears on the screen, the factory default will be set.
5. To exit this mode, press[CHANNEL UP/DOWN] button to go to TV mode, or press [POWER] button to turn the power off.
Note: The name of buttons may vary with the brand of unit.
LCD TV Section 
1. Turn the power on.
2. To enter the service mode, press the service button on the service remote control unit.
To cancel the service mode, press [POWER] button on the service remote control unit.
3. Press [INFO] button on the service 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 complete.
FIRMWARE RENEWAL
DVD Section 
1. Turn the power on and press [EJECT] button on the remote control unit to put the LCD TV/DVD into DVD mode. Then remove the disc.
2. To put the LCD TV/DVD into F/W version up mode, press [9], [8], [7], [6], and [MODE] buttons on the remote control unit in that order.
3. Insert the disc for version up into the disc slot.
4. The LCD TV/DVD enters the F/W version up mode automatically. Fig. b appears on the screen. Make sure to insert the proper F/W for the state of this mode.
5. After programming is finished, the disc will be ejected automatically. Fig. c appears on the screen and the checksum will be shown.
At this time, no button is available.
6. Remove the disc.
7. Unplug the AC cord from the AC outlet. Then plug it again.
8. Press [EJECT] button on the remote control unit to put the LCD TV/DVD into DVD mode again.
9. Press [1], [2], [3], [4], and [INFO] buttons on the remote control unit in that order.
10. Press [CLEAR] button on the remote control unit.
When “OK” appears on the screen, the factory default will be set. Then the firmware renewal mode is complete.
11. To exit this mode, press [CHANNEL UP/DOWN] button to go to TV mode, or press [POWER] button to turn the power off.
LCD TV Section 
Equipment Required
a. USB memory
b. Remote Control Unit
Firmware Update Procedure
Note: 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 memory to the USB port.
3. Plug the AC cord in the wall outlet and turn the power on.
4. The update will start.
5. When the firmware update is completed, Unplug the AC cord and kindly remove the USB memory from the USB port. Plug the AC cord in the wall outlet again and turn the power on.
Note:
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 complete.
How to convert the user remote to service remote 
Cut “A” portion of the attached remote control unit as shown in Fig