DYJDQ-04C LCD TV Maintenance Skills Evaluation Experimental Device

"  Home Appliance Audio and Video Rep*r Skills Practical Tr*ning Assessment Device" is based on the "Technical Specifications for Vocational Skills Tr*ning and Appr*sal Equipment for "Household Electronic Product Rep*rers" issued by the Ministry of Labor and Social Security of the People's Republic of China , in accordance with the teaching and tr*ning of vocational education The products developed based on the requirements are suitable for the practical tr*ning and teaching of television principles and m*ntenance, household electronics principles and m*ntenance and other professional courses in applied electronic technology, electronic and electrical application and m*ntenance in higher vocational colleges and vocational schools.

2. Technical performance

1. Input power supply: single-phase three-wire AC220V±10% 50HZ

2. Working environment: temperature -10℃～+40℃, relative humidity <85% (25℃)

3.Complete machine capacity: <300VA

4. Safety protection: action current ≤ 30mA, action time ≤ 0.1s

5. Overall dimensions: 160cm×80cm×135.5cm

3. System composition

1. Control and AC power supply part

(1) Provide single-phase AC power supply and automatic protection device for direct short circuit between lines. Control the working power supply of the tr*ning platform .

(2) Provide one ~220V socket to provide working power for external instruments.

2. DC power supply part

(1) Switching power supply: +5V, +24V, 12V.

(2) Color TV signal generator: Using a large-scale programmable logic controller and a high-definition color signal source with pixel-level algorithms. It has clear images, accurate timing (graphics, high sampling rate, accurate colors, graphic selection). There are 16 channels of TV signal formats: divided into 16 formats such as circle, dot, grid, black and white grid, color, monochrome, etc., which can be directly pressed through the button. Select (output signal: video, audio (IF 6.5M), RF output interface) Signal format: PAL-D/K.

 (3) A total of 16 images are displayed, including color bars, white grating, red grating, green grating, blue grating, black grating, 12 steps, cross center and display amplitude, four-level chessboard, and color chessboard.  

4. Intelligent tr*ning and assessment system

1. The computer can monitor 1-126 household appliances intelligent assessment station

2. Multiple fault points have been set up.

3. With curling function

4. With winding function

5. It has the function of clearing single and all experimental benches.

6. It has the ability to automatically detect the communication connection status of each household appliance assessment station.

7. Can generate student personal transcripts

8. Can conduct statistics and analysis on student assessment status

9. There is a password to enter the system. You can change the password after entering the system.

10. With printing function

11. It has the function of limiting the number of answers

5. LCD TV technical indicators:

 1. Monitor size: 32 inches;

 2. Contrast ratio: 400:1;

 3. Resolution: 1920×1080;

4.Response time: <16 ms;

5. Screen brightness: 500cd/㎡;

6. Viewing angle: 178 degrees;

7. Screen ratio: 16:9;

8.Format: NTSC/PAL/SECAM;

9. Input: YPbPr; VGA; HDMI; AV; USB

10. Working power supply: AC220V±10%-50Hz;

11. Ambient temperature: 5℃～35℃;

12. Relative humidity: ≤85% (25℃);

13.Complete machine power consumption: <100W;

14. Signal input: RF 48MHz-470MHz;

6. Practical tr*ning function

1. Understand the internal structure of LCD TV;

2. Understand the basic structure of the m*n components in LCD TVs;

3. Understand the basic working principles of the m*n components in LCD TVs;

4. Understand the composition of the m*n unit circuits of LCD TVs;

5 Understand the working principles of the m*n unit circuits of LCD TVs;

6. Understand the composition and working principle of the LCD screen;

7. Understand the functions and principles of m*n ICs;

8. How to enter and debug the factory menu;

9. Welding method of patch components;

10. Working principle of TV switching power supply circuit;

11. Detection and treatment of three-no-f*lure phenomena;                            

12. The remote control indicator light is on, and there is no troubleshooting guide;

13. Detection and processing of screen brightness, sound, and no image f*lure;

14. M*ntenance guidance for screen brightness, no sound, and no image f*lure;

15. Detection and processing of normal sound and black screen problems;

16. Detection and processing of normal image faults without accompanying sound;

17. Detection and treatment of button unresponsiveness

18. Detection and treatment of remote control unresponsive f*lure;

19. M*ntenance instructions for the f*lure to read the USB flash drive;

20. M*ntenance guidance if the AV image is normal and there is no sound f*lure;

21. M*ntenance guidance for white screen f*lure;

22. M*ntenance guidance for image color cast or lack of color faults;

23. M*ntenance guidance for screen f*lure;

24. M*ntenance guidance for no signal f*lure after connecting to VGA;

25. M*ntenance guidance for the problem that the indicator light does not light up;

26. Detection and treatment of the problem of no sound from one side of the speaker;

27. M*ntenance guidance for colorless fault phenomena;

28. How to click the LCD screen;

29. LCD screen interface definition;

30. Complete machine assembly;

31. Measurement and analysis of electronic tuner

32. Video signal processing process measurement and analysis

33. Audio signal processing process and analysis

34. AD analog-to-digital conversion control measurement and analysis

35. Measurement and analysis of switching regulator circuit

36. Measurement and analysis of inverter backlight drive circuit

7. Tr*ning platform configuration (configuration for each platform)