Dynex DX-LCD22-09, LC-22HV40 Schematic

CONTENTS

Safety precautions………………………………………………………………………..…

Alignment instructions …………………………….…….…………………………………

Method of software upgrading……………………………………………………………..

Method of flash writing………………………………………………………………………

Working principle analysis of the unit……………………………….………….………….

Block diagram…………………………………..………………………………….…………

IC block diagram………………………………………………………………………..……

Wiring diagram …………………………………………………………………………….

Troubleshooting guide ………………………………………………………………..……

Schematic diagram…………………………………………………………………………

APPENDIX-A: Assembly list

APPENDIX-B: Exploded View

Attention: This service manual is only for service personnel to take reference with. Before

servicing please read the following points carefully.

Safety precautions

1. Instructions

Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will; b) Be sure to use anti static electric iron; c) It’s a must for the welder to wear anti static gloves. Please refer to the detailed list before replacing components that have special safety requirements. Do not change the specs and type at will.

2. Points for attention in servicing of LCD

2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to use the screen of the original model for replacement.

2.2 The operation voltage of LCD screen is 700-825V. Be sure to take proper measures in protecting yourself and the machine when testing the system in the course of normal operation or right after the power is switched off. Please do not touch the circuit or the metal part of the module that is in operation mode. Relevant operation is possible only one minute after the power is switched off.

2.3 Do not use any adapter that is not identical with the TV set. Otherwise it will cause fire or damage to the set.

2.4 Never operate the set or do any installation work in bad environment such as wet bathroom, laundry, kitchen, or nearby fire source, heating equipment and devices or exposure to sunlight etc. Otherwise bad effect will result.

2.5 If any foreign substance such as water, liquid, metal slices or other matters happens to fall into the module, be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high voltage or short circuit.

2.6 Should there be smoke, abnormal smell or sound from the module, please shut the power off at once. Likewise, if the screen is not working after the power is on or in the course of operation, the power must be cut off immediately and no more operation is allowed under the same condition.

2.7 Do not pull out or plug in the connection wire when the module is in operation or just after the power is off because in this case relatively high voltage still remains in the capacitor of the driving circuit. Please wait at least one minute before the pulling out or plugging in the connection wire.

2.8 When operating or installing LCD please don’t subject the LCD components to bending, twisting or extrusion, collision lest mishap should result.

2.9 As most of the circuitry in LCD TV set is composed of CMOS integrated circuits, it’s necessary to pay attention to anti static. Before servicing LCD TV make sure to take anti static measure and ensure full grounding for all the parts that have to be grounded.

2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or moving the set please take care not to touch or scratch them. Once they are damaged the screen

would be unable to work and no way to get it repaired. If the connection wires, connectors or components fixed by the thermotropic glue need to disengage when service, please soak the thermotropic glue into the alcohol and then pull them out in case of damage.

2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling.

2.12 For the storage make sure to put it in a place where the environment can be controlled so as to prevent the temperature and humidity from exceeding the limits as specified in the manual. For prolonged storage, it is necessary to house it in an anti-moisture bag and put them altogether in one place. The ambient conditions are tabulated as follows:

Temperature Scope for operation 0 ~ +50 oC

Scope for storage -20 ~ +60 oC

Humidity Scope for operation 20% ~ 85%

Scope for storage 10% ~ 90%

2.13 Display of a fixed picture for a long time may result in appearance of picture residue on the screen, as commonly called “ghost shadow”. The extent of the residual picture varies with the maker of LCD screen. This phenomenon doesn’t represent failure. This “ghost shadow” may remain in the picture for a period of time (several minutes). But when operating it please avoid displaying still picture in high brightness for a long time.

3. Points for attention during installation

3.1 The front panel of LCD screen is of glass. When installing it please make sure to put it in place.

3.2 For service or installation it’s necessary to use specified screw lest it should damage the screen.

3.3 Be sure to take anti dust measures. Any foreign substance that happens to fall down between the screen and the glass will affect the receiving and viewing effect

3.4 When dismantling or mounting the protective partition plate that is used for anti vibration and insulation please take care to keep it in intactness so as to avoid hidden trouble.

3.5 Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.

Alignment instructions

1. Test equipment

VG-848 (YPbPr, VGA signal generator) VG849 (HDMI signal generator) CA210 (white balancer)

2 Alignment flow-chart

2.1 power test Connect all boards according the wiring diagram and power on, test the voltage of XV04 and

the data is shown in table1.

Table1 voltage of XV04 pins

Pin 1 2 3 4 5, 6 7, 8 9 10 11 12 13

Min.(V) 4.85 0 4.85 0 14.80 0 4.65 3.40 0 31.40 0

Typ.(V) 5.00 0 5.00 0 15.00 0 4.80 3.50 0 32.00 0

Max.(V) 5.35 0 5.35 0 15.75 0 5.00 3.60 0 32.60 0

2.2 alignment flow-chart

The alignment flow-chart is shown as fig-1

Check if DDC, HDCP KEY and FLASH are written

Produce the data processing board

Combined test for general assembly (check if the power is 120V)

White balance adjustment

Connect to the center signal source and check if various

functions of TV (station leaking, analog control), earphone

and speaker output are normal

Input AV/SVIDEO signal source and check the functions

Input HD signal source and check YPbPr function

Input VGA signal source and check the display, various

functions (analog control) and H/V center.

Input HDMI signal source and check the display, various

functions (analog control) and H/V center.

Preset ex-factory

Check the accessories and pack

Fig-1 adjustment flow-chart

3 Adjustment instruction

3.1 Unit adjustments

3.1.1 Connect all the boards according to wiring diagram, connect with power and observe the

display.

3.1.2 Method for using factory menu:

a) Press “INPUT”, “2”, “5”, ”8” and “0” one by one to enter level-one factory menu; b) Press “▲” and “▼” to move the cursor to the adjustment page of the level-one factory menu

then press “ENTER” or “►”to enter; c) Press “▲” and “▼” to move the cursor up and down; d) When the cursor move to a certain adjust item, press “◄” and “► “ to adjust value; e) Press “MENU” to exit to the previous factory menu; f) Press “EXIT” to exit the factory menu; g) After exit the factory menu, press “SLEEP” to enter the factory menu again as long as power on. h) “Power on mode” item of “Other setting” menu: on= turn on; off =standby; memory=memory

function of turn on

3.2 White balance adjustment

3.2.1 Before adjustment Before adjustment, the unit should keep working for over 30 minutes to be in a stable status. Use BBY channel of CA210 and only adjust the color temperature of 9300K(COOL). In order to make sure the color temperatures of 8000K and 6500K are up to the master, please keep the color temperature of light level be X=285±2 Y=293±2 and the low level be X=285±5 Y=293±5 when adjusting.

3.2.2 Four groups white balance adjustments

3.2.2.1 ATV adjustment (same for AV, S-VIDEO) VD AGC Gain correction: select the 21 channel in AIR mode, enter factory menu VD AGC Setting and select VD AGC Gain, press “►” till display “OK”, then press “MENU” to return to the previous menu. White balance adjustment: enter the factory menu Color Temp, set Color Mode to Cool first, a 11-step gray scale picture will appear, fix Gain Green, adjust Gain Red, Gain Blue to let the color coordinate of the ninth level to be (285, 293); fix Offset Green, adjust Offset Red, Offset Blue to let the color coordinate of the third level to be (285, 293). Adjust Gain Red, Gain Blue, Offset Red and Offset Blue repeatedly until the value of the two levels gray scale are (285, 293) then press MENU to return to the previous menu or press Save to EEPROM to store the value. Check if the color temperatures of Normal and Warm are up to the mustard, if not, adjust Gain Red,

Gain Blue, Offset Red and Offset Blue till they are accord with the requirement.

3.2.3.2 DTV adjustment (same for HDMI) Select the 26 channel in AIR mode, enter the factory menu Color Temp, set Color Mode to Cool first, a 11-step gray scale picture will appear, fix Gain Green, adjust Gain Red, Gain Blue to let the color coordinate of the ninth level to be (285, 293); fix Offset Green, adjust Offset Red, Offset Blue to let the color coordinate of the third level to be (285, 293). then press MENU to return to the previous menu or press Save to EEPROM to store the value. Check if the color temperatures of Normal and Warm are up to the mustard, if not, adjust Gain Red, Gain Blue, Offset Red and Offset Blue till they are accord with the requirement.

3.2.2.3 YPbPr adjustment ADC correction: Input 480i/60Hz signal of 75% color bar and gray scale to YPbPr (VG848 Timing 968, Pattern 918), enter the factory menu ADC Setting and perform ADC Auto. White balance adjustment: input 1920x1080I/60Hz of 8-level gray scale signal to YPbPr from VG848 YPbPr channel, enter the factory menu Color Temp, set Color Mode to Cool first, fix Gain Green, adjust Gain Red, Gain Blue to let the color coordinate of the seventh level to be (285, 293); fix Offset Green, adjust Offset Red, Offset Blue to let the color coordinate of the second level to be (285, 293). Adjust Gain Red, Gain Blue, Offset Red and Offset Blue repeatedly until the value of the two levels gray scale are (285, 293) then press MENU to return to the previous menu or press Save to EEPROM to store the value. Check if the color temperatures of Normal and Warm are up to the mustard, if not, adjust Gain Red, Gain Blue, Offset Red and Offset Blue till they are accord with the requirement.

3.2.2.4 VGA adjustment ADC correction: Input VESA 800x600/60Hz signal of chess to VGA (VG848 Timing 854, Pattern

914), enter the user menu ADVANCED and perform AUTO to display the whole picture, enter the factory menu ADC setting and perform ADC Auto to correct ADC. White balance adjustment: input 800x600I/60Hz of 8-level gray scale signal to VGA from VG848 VGA channel, enter the factory menu Color Temp, set Color Mode to Cool first, fix Gain Green, adjust Gain Red, Gain Blue to let the color coordinate of the seventh level to be (285, 293); fix Offset Green, adjust Offset Red, Offset Blue to let the color coordinate of the second level to be (285, 293). Adjust Gain Red, Gain Blue, Offset Red and Offset Blue repeatedly until the value of the two levels gray scale are (285, 293) then press MENU to return to the previous menu or press Save to EEPROM to store the value. Check if the color temperatures of Normal and Warm are up to the mustard, if not, adjust Gain Red, Gain Blue, Offset Red and Offset Blue till they are accord with the requirement.

4 Performance check

4.1 TV function Connect RF terminal with central signal source, enter Channel menu and perform auto search, check if there are channels be skipped. Check the speaker and the picture. Especially notice that the single should include NTSC and ATSC.

4.2 AV/S-Video terminals Input AV/S signal, check if the picture and sound is normal.

4.3 YPbPr/YCbCr terminal Input YUV signal (VG848 signal), separately input the signal of table2 and check if the display and sound is normal.

Table2 YUV signal format

No. Resolution H-frequency (kHz) V-frequency (Hz)

720x480i 15.734 59.94/60 13.5 480i

720x480p 31.469 59.94/60 27.00 480p

1280x720p 44.96 59.94 74.18 720p(59p)

1280x720p 45.00 60.00 74.25 720p(60p)

1920x1080i 33.75 59.94 74.25 1080i(59i)

1920x1080i 33.75 60.00 74.25 1080i(60i)

1920x1080p 67.43 59.94 148.35 1080p(59p)

1920x1080p 67.5 60 149.00 1080p(60p)

Pixel clock pulse frequency (MHz)

Remark

4.4 VGA terminal Input the VGA signal (VG848 signal generator), separate input format signal of table3 and check the display and sound. If the image is slight deflection of the H-field, press “Advance” of OPTION menu to do auto correction.

Table3 VGA signal format

No. Resolution H-frequency (kHz) V-frequency (Hz)

720x400@70Hz 31.47 70.08 28.32 IBM

640x480@60Hz 31.50 60.00 25.18 Industry

800x600@60Hz 37.90 60.00 40.00 VESA

1024x768@60Hz 48.40 60.00 65.00 VESA

1280x1024@60Hz 63.98 60.02 108.00 VESA

1680x1050@60Hz 64.67 59.88 119.00 VESA

Pixel clock pulse frequency (MHz)

Remark

4.5 HDMI terminal Input HDMI signal (VG848 signal generator), separate input signal of table2 and check the display and sound.

5 presetting before ex-factory

Enter the factory menu and select Shipment, the unit will preset the data automatically. Perform the step after factory menu adjustment. SHIPMENT will perform the steps below:

1) Clear the program information of the channel

2) Clear VCHIP information

3) Default setting of user analog

4) Set Menu Language to English

5) Set AIR/CABLE to AIR

6) Power on mode is Off

6. Software instruction

Table4 software instruction

No. Code No. Type Function Written before

paste

Method

NC4 5272501601 S25FL016

NC2 5272404002 AT24C04 HDCP KEY Yes

NB14 5272402002 AT24C02 HDMI EDID Yes

NB09 5272402002 AT24C02 VGA EDID Yes

Main CPU

program

Yes Written with instrument like

ALL11, write-protection

refers to note1.

Written with instrument like

ALL11

Note1: the method of write-protection setting: enter ALL-100 interface, select Config, press “config

setting” and set “Protect” to “ALL Protect”, set “SRWD” to “Enable”. Select “config” when writing. The

“write-protect” will be set again when ALL-100 program restart.

Method of software update

Please follow listed below steps:

1. Copy all files to your computer, Include three files ISP_Tool_V43.exe: Debug Tool software for Dynex to update Dynex_32HV36_new.bin: New software for Dynex 32 LCD， (Note: Maybe the update filename no as same as Dynex_32hv36_new.bin, the filename only for example) Dynex32_software_update.doc: Document of software update

2. Cable Connect

The debug tool board one port connect your computer LPT, the other port connect to

Dynex32LCD RS232.

3. Connect the Dynex to Power Socket. The Power LED will turn Red. You can update the software at TV Power on of TV Standby.

4. Run Debug Tool Software Double click the file of ISP_Tool_V43.exe , then you can see the follow picture.

5. Click the icon of Device (If not the first time to run this software we can skip step 5)

Set the Device information as below

6. Click the icon of Connect

7. If cable connect is ok, you can get the follow picture. If failure please double check the cable connect and try again.

8. Click the icon of Read

Click the follow Icon of Read

to Select the update software for Dynex

Open

Select Open Icon. Then will appear the follow picture.

9. Click the Icon of Auto

Then will appear the follow picture

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