Schneider 20M301- how to enter service mode, Firmware update, circuit diagram, alignment procedure and more

Factory menu (Service mode menu)
Methods to enter factory menu of analogous board
1) OSD language has to be English.
2) Start from TV-mode.
3) Press “i” key.
4) Enter 6 4 0 5
5) Press 1 and 2 key, we can see service menu,
6) Press “exit” key to exit.

Methods to enter factory menu of digital board

1) Start from TV-mode.

2) Press “0”key.

3) Enter 6 4 0 5

4) Press 1,2 and 3 key, we can see service menu.

5) Press “exit” to exit the service mode.

SW Loading Procedure

Tools

Computer (with monitor) 1pcs
Data cable (Picture 001) 1pcs
Special converter (Picture 002) 1pcs
Special loading board.

Loading procedure for analogous board
1. Copy the updated software to the computer.
2. Remove tuner from LCD set.
3. Switch on LCD set, and set it in PC mode.
4. Connect LCD TV and computer with the data cable, one end with a switch to tuner port of LCD TV set the other end to the converter, which connected to the printer port of the computer.

5. Run the updated software (double click the software icon).

6. Turn on the switch on the board of the data cable.

7. Press any key on the computer keyboard, and then turn off the switch on the board of the data cable immediately.

8. Software begins to be loading. During loading, we should pay attention to the loading schedule indicator on the screen. Until about 5 lines of indication dots on the screen, the loading is complete (different software may cause different indication dots). The content of the last page of the software will appear on the screen. Then check the 4 last lines content,

they can’t all be FF.

Loading procedure for digital board
1. Remove tuner; put the loading board on the tuner’s position, and Keep the switch SW2 on the loading board on.

2. Switch LCD TV on and keep it in standby mode. The red LED on the loading board will flicker.
3. Press SW3 on the loading board. The green LED will flicker. It means the software is being loaded.
4. When the green LED stop flickering, it means loading is complete.
5. Switch LCD TV set off. Remove loading board.

After loading reset the data of E2 PROM

1. Set language to English.
2. Press keys of "i ”, “6,4,0,5," to enter the Factory menu of Analog board.
3. Select item of "e2prom ID reset" and press "-->" key to set the status of "off" to "on".
4. Press "0" key to set the "e2prom reset" active until the status "on" turn to "off".
5. Quit the factory menu.
6. Press "i" to enter "user menu" and select "Reset" item by "up/down keys"
7. Press "-->" key two times to act the "reset" until a indicated "reset …ok"
8. Quit the analog user menu
9. Press keys of "0, 6,4,0,5," and "1" to enter the "e2prom reset sub- Factory menu" of Digital board.
10. Select item of "RST" and press "-->" key to act the "reset" on and an OSD of "waiting…" appears.
11. Set will turn off automatically when finish of resetting.

After loading we may need to adjust the set again according to alignment procedure

Alignment procedure

AGC adjusting
1) Power on the set and connect a TV signal to the tuner.
Request of the TV signal as below:
F=48.25MHZ
System: PAL B/G
Pattern: color bar
Intensity: 65 db
2) Press “i” key of remote control, th en press 6, 4, 0, 5 to enter factory menu, set AGC value to 14, and
check the noise of screen is just at minimum.
Alignment of white balance
1) Adjustment of white balance in VGA mode.
1.1 Connect VGA signal, 1024x768 60hz, and white field, to LCD TV set.
1.2 Set the values of brightness to 50%, and contrast to 70%.
1.3 Using a color analyzer to test the color coordinates.
1.4 Press 0,6,4,0,5 key in RC to enter factory mode, adjust the value of R, G and B to get x=284 15 and y=299 15.
1.5 Press exit key to exit.

2) Adjustment of white balance in TV mode.

2.1 Connect TV signal, PAL/BG system, and white field, to LCD TV set.

2.2 Set the values of brightness to 50%, and contrast to 70%.

2.3 Using a color analyzer to test the color coordinates.

2.4 Press 0,6,4,0,5 key in RC to enter factory mode, adjust the value of R, G and B to get x=284 15 and y=299 15.

2.5 Press exit key to exit.

Alignment of mid-brightness

1) Power on the set and connect a TV signal, 8 degrees gray signal, to the tuner.

2) Set the value of brightness to 50%, contrast to 70%. (Actually, it is the condition after reset)

3) Press “i” key of remote control, then press 6, 4, 0, 5 to enter factory menu. Then change the value of mid.brightness to make the 2 darkest bars can be identified, and the 2 brightest bars can be identified too. It means we get a perfect picture on the screen.

Note 1, we are finding a more perfect method to adjust white balance and sub-brightness. If we just adjust mid.brightness to get proper sub- brightness. The value of mid.brightness may be very low or

very high. With too low or too high value of mid-brightness, we may get a poor control curve of brightness.

Schematic