TCL 21K9US-NX56E AP – color TT – How to enter service mode – adjustments – circuit diagram

The way to enter P-Mode
Method one
A) Switch on the TV set.
B) Press the “MENU” key on RC to show the “PICTURE” OSD menu.
C) Move the cursor to “Contrast” item then press the “9”, “7”, “3”, “5” key continuously on RC within 3 seconds then enter P-Mode. The “P” letter will appear on the left low corner of the screen when enter P-Mode. Also the “FACTORY HOTKEY” will be set to “ON (= 1)”.

Other method
Press the “RECALL” key on RC to enter P-mode directly.
Note
1. This will be active only when the “FACTORY HOTKEY” had set to “ON (= 1)”.
2. When the power on with “FACTORY HOTKEY” had set to “ON (= 1)”, the set will enter the P-Mode automatically

Exit the P-Mode
Press the “RECALL” or “MENU” key on RC to exit the P-Mode.

Keys’ function on RC at the P-Mode
Use the RC to navigate in P-Mode:
Press “0” or “AT” key for screen voltage adjustment.
Press “1” to “8” and “FAV” key to select factory adjustment page.
Press “9” key to switch the I2C bus off/on.
Press ▲▼ or “CH+ CH-”key to select option.
Press ◄► or “VOL+ VOL-” key to adjust or select option.
Press “DISPLAY” key to display software version.
Press “MENU” key to close the factory menu or return to the previous menu or exit the P-Mode.
Press “RECALL” key to enter or exit the P-Mode.

[All change in P-Mode will be saved in EEPROM automatically.]

Adjustment

B+ Voltages
1. All relevant connectors and modules must be connected and inserted.
2. Main voltage is at 220VAC, 50Hz.˄ voltage range:110VAC~240VAC,50Hz˅
3. Connect a voltmeter to B+ (Cathode of D808 for NX56 chassis or cathode of D833 for NX56B chassis) and switch on the set.
4. Input Philips test pattern signal and standard mode.
5. Adjust VR801, it should as the value in below form B+ Voltage.

RF AGC alignment

Method 1

A. Connect the detector as shown below (Picture 3.2) to collector of Q101.

B. Receive a grey scale signal with 70dBV amplitude.

C. Enter P-Mode, press “6” key on RC to select “AGCT”.

D. Adjust AGCT item until the output of the detector becomes 0.8Vpp.

Method 2

A. Receive a grey scale signal with 60dBV amplitude.

B. Enter P-Mode, press “6” key on RC to select “AGCT”.

C. Adjust the “AGCT” value until the hint display “AGC” just change between “0” and “1”

Screen & Focus adjustment
Note: Alignment below should be done after 15 minutes warm up of TV

1. Input cross hatch pattern signal to RF input.
2. Enter P-Mode.
2. Press “0” key on the RC and the screen will become a horizontal line.
3. Adjust the “SCREEN” VR of the FBT until the horizontal line can just be seen barely (minimum visible intensity).
4. Press “0” key again on the RC to exit the screen voltage adjustment mode.
5. Adjust the “FCOUS” VR of the FBT until the vertical line and horizontal line becomes clear.

White Balance Adjustment

1. Input a black and white pattern to RF input.

2. Enter P-Mode, press key “3” to select white balance adjustment menu.

3. Use the color analyzer to measure the black side of the screen. Adjust the value of

“RC”,”GC” and “BC” to set the reading of the color analyzer to x=274, y=280. (11500 K).

4. Then measure the white side of the screen. Adjust the value of “RD”, “GD” and “BD” to set the reading of the color analyzer to x=274, y=280. (11500 K).

5. Repeat step 3&4 until you can get the correct reading for both black and white sides.

Note:

A. The “SubBRI” and “SubCON” items are used to assistant the white balance adjustment.

It is the same function as the user OSD menu “Brightness” and “Contrast” items. You can adjust these items to get the expect intensity when adjusting the white balance. 

B. The “BLOR-Y”, “BLOG-Y” and “BLOB-Y” items are used for the YUV white balance black level offset setup. When the TV white balance adjustment is done, connect a black and white pattern to YUV input terminal. Use the color analyzer to measure the black side of the screen. Adjust the value of the “BLOR-Y”, “BLOG-Y” and “BLOB-Y” to set the reading of the color analyzer to x=274, y=280.

Sub brightness adjustment

1. Input eight steps gray signal.

2. Press key “3” to enter sub-brightness adjustment.

3. At dynamic state, adjust “BRTC” until the secondary gray bar just to be seen.

Picture Geometry adjustment

Vertical geometry adjustment

1. Input a PAL crosshatch pattern signal to RF input.

2. Enter P-Mode, press key “1” to select vertical geometry adjustment. (The OSD menu for this adjustment as below table 3.6.1. For NTSC signal, the “-50” will be replaced with

“-60”.)

3. Adjust the value of the corresponding item to make the vertical geometry of the pattern look good.

4. Apply NTSC signal to adjust these value for NTSC vertical geometry.

Note:
1. For NTSC signal, the “-50” will be replaced with “-60”.
2. For NTSC signal, only the “VCEN-60” and “VSIZE-60” items need the adjustment, the other items use the same data as PAL signal.

3. On producing, please use the “AUTO OFFSET” (On page “2”) function to easy the geometry adjustment of NTSC signal. When finished the PAL signal geometry adjustment, press “2” key to enter page “2” to select “AUTO OFFSET” item, press “> ” key to active the automatic offset function. Then the geometry adjustment of NTSC signal will finish automated. If the geometry of NTSC signal is look good, you don’t need to adjust the geometry of NTSC signal any more.

Horizontal geometry adjustment
1. Input a PAL crosshatch pattern signal to RF input.
2. Enter P-Mode, press key “2” to select horizontal geometry adjustment. (The OSD menu for this adjustment as below table 3.6.2. For NTSC signal, the “-50” will be replaced
with “-60”.)
3. Adjust the value of the corresponding item to make the horizontal geometry of the pattern look good.
4. Apply NTSC signal to adjust these value for NTSC horizontal geometry.

Note:

1. For NTSC signal, the “-50” will be replaced with “-60”.

2. For NTSC signal, only the “HCEN-60” and “HSIZE-60” items need the adjustment, the other items use the same data as PAL signal.

3. On producing, please use the “AUTO OFFSET” (On page “2”) function to easy the geometry adjustment of NTSC signal. When finished the PAL signal geometry adjustment,

press “2” key to enter page “2” to select “AUTO OFFSET” item, press ”>”” key to active the automatic offset function. Then the geometry adjustment of NTSC signal will finish

automated. If now the geometry of NTSC signal is look good, it not needed to adjust the geometry of NTSC signal any more.

Producing parameter setup and option

Enter P-Mode, press key “4” to select page “4”.Set the corresponding item to require value. See below table for detailed description.

Set the shopping status

When trigger the “SHOP INIT” item form “0” to “1”, the TV will be put on selling status.

The TV status after shopping status:

A. “FACTORY HOTKEY” had set to “OFF”.

B. Picture set to “Standard” status. (Brightness=50, Contrast=50, Colour=50, White tone=Normal.)

C. Sound set normal.(Volume=30,Balance=50.)

Set the user picture and sound curve value

C. Adjust the value until the hint display just change between “AC: NORMAL” and “AC: LOW”.
D. Connect the main voltage at high threshold 255VAC/50Hz.
E. Select item “POWER HIGH.
F. Adjust the value until the hint display just change between “AC: NORMAL” and “AC: HIGH”.
2. Enter P-Mode, press key “5” to select page “5”. Set the corresponding item to require value. See below table for detailed description.

Description for AUTO OFFSET and GET OFFSET

The “GET OFFSET” can use to make the EEPROM copy by PE engineer. When the PAL and NTSC geometry adjustment had finished, trigger the “GET OFFSET” from “0” to

“1” to store the geometry offset datum between PAL and NTSC in EEPROM.  On producing, these geometry offset datum can use to easy the NTSC geometry adjustment. When finished the PAL geometry adjustment, trigger the “AUTO OFFSET” from “0” to “1”, then the geometry adjustment of NTSC signal will finish automated. If now the geometry of NTSC signal is look good, it not needed to adjust the geometry of NTSC signal any more.

3. Enter P-Mode, press key “6” to select page “6”. Set the corresponding item to require value. See below table for detailed description.

4. Enter P-Mode, press key “7” to select page “7”. Set the corresponding item to require value. See below table.

5. Enter P-Mode, press key “8” to select page “8”. Set the corresponding item to require value. See below tables for detailed description.

*Note: When change the Language or the tuner type, you must AC restart the TV set to make it active.
Note 1˖ TUNER TYPE=0 07-389FI5-NF3T, 07-389FI5-NF2XG, 07-389FI5-NA2XG, 07-389FI5-SA0XG

Enter P-Mode, press key “FAV” to select page “9”. Set the corresponding item to require value. See below table.

Producing parameter setup and option page “9”

Screen voltage (VG2) adjustment with AKB function
1. Put the TV in AV source without input signal.
2. Enter P-Mode, press RC key "AT", there will display
3. Adjust the "SCREEN" VR of the FBT until VG2 hint display (LOW/OK/HIGH) display "OK" stably.
4. Press “MENU” return to P-Mode.

Circuit diagram

Power Supply Section

AC supply 220V/110v through filtering network and rectifying circuit and get 300Vdc voltage. LF801/LF801A and CX802 makes up a differential mode rejection, LF802 and CY801,CY802 makes up a common mode rejection network. D801-D804 is rectifying network. 300Vdc voltage supply pin3 of T801, also through R804 send to pin8 of IC801 NCP1337. Pin5 of IC801 sends out the PWM signal to control Q801 working in switch on and off situation. IC803 is optocoupler.