Telefunken TK 2929STX – 29 inch CRT TV – Schematic (Circuit diagram)

Used ICs: TMPA8829, 24C08 (system memory), MSP43X5G, TDA9844, TDA8945, TDA8177, TDA16846 (SMPS control), TC90A49P

Schematic [Click on the schematic to magnify]

How to enter service mode, firmware update, service adjustments – Sharp LC46D62U, Sharp LC52D62U - power LED blinking error codes chart

LC-46D62U, LC-52D62U Sharp LCD TVs – software update, Service mode, service adjustments – 46 and 52 inch LCD TVs
Power LED blinking codes [ Error codes chart]

Adjustment procedure
The adjustment values are set to the optimum conditions at the factory before shipping. If a value should become improper or an adjustment is required due to part replacement, make an adjustment according to the following procedure.
After replacement of any PWB unit and/or IC for repair, please note the following.
When replacing the following units, make sure to prepare the new units loaded with updated software.
MAIN Unit: DUNTKD934FM01 (LC-46D62U) / DUNTKD934FM02 (LC-52D62U)
Upgrading of each microprocessor software
CAUTION: Never “POWER OFF” the unit when software upgrade is ongoing. Otherwise the system may be damaged beyond recovery.

Software version upgrade

The model employs the following software.

* Main software

* Monitor microprocessor software

The main software and the monitor microprocessor software can be upgraded by using a general-purpose SD memory card.

The followings are the procedures for upgrading, explained separately for each of the main software, the monitor microprocessor software.

Main software version upgrade

Get ready before you start

* SD memory card of 32MB or higher capacity

* PC running on Windows 98/98SE/ME/2000/XP operating system

* SD memory card reader/writer with USB connectivity

* SD memory card formatting software

(Downloadable at http://panasonic.jp/support/audio/sd/download/sd_formatter_e.html)

Preparations
To upgrade the main software, it is necessary to get ready the SD card for version upgrade before you start. Follow the steps below and create the SD card for version upgrade.
1. Insert the SD card into the SD card reader/writer. Start the SD card formatting software. Click [Format]. (When you have the drive options, select the drive where the SD card is inserted before you proceed.)

2. When the formatting is over, the window appears. Click [OK].

3. Click [Exit] to finish the formatting.
NOTE: When you are done, take out the SD card once to make sure it is finished, and then insert it again.

4. Copy the binary image file DA60UAxx.SDC (named temporarily) for version upgrade to the root directory (folder) of the SD card drive.
NOTE: In the SD card drive, do not store other folders or unrelated files, or more than one binary image files for version upgrade. Now the SD card for version upgrade is ready.

Upgrading the software
1 Turn off the AC power (Unplug the AC power cord).
2 Insert the upgrading SD card (prepared as instructed above) into the service slot.
NOTE: Be careful not to insert the SD card in the wrong way. Otherwise the card may come into the set and fail to come out.
3 Turn on the AC power (Plug in the AC power cord).
4 A couple to dozen seconds after the set starts, the upgrade screen below shows up.

5 If any of the procedures fails, the following upgrade failure screen shows up. For the failing procedure, the “NG” marking turns red.
NOTE: In such case, try to upgrade the software again. If it still fails, the hardware may be in trouble.

6 When all the procedures are complete, the following upgrade success screen shows up. The new software version can be confirmed on screen.
The version number appears when each item has been successfully upgraded. Finally the main version number appears on screen.

7 Turn off the AC power (Unplug the AC power cord). Take out the upgrading SD card.
8 Now the software has been upgraded.
NOTE: Then get the set started and call the process adjustment screen 1/26 to check the main software version.
CAUTION: 

1) Do not take out and put in the SD memory card during formatting.
2) With the SD formatted, all the data stored on the medium will be deleted.
3) Do not start the SD formatting with the memory card’s WRITE PROTECT switch still on.
4) If the SD memory card format software does not recognize the SD memory card, take out and put in the SD memory card again, and click the “UPDATE” button.
5) After checking the performance, use the set under its interface environment.
6) The SD formatting is impossible on drives that are not recognized “REMOVABLE”.

Upgrading the monitor microprocessor software

Kit
Have the above “Upgrading the main software” kit or equivalent at hand.

Preparations
As discussed in “Upgrading the main software” earlier, create the SD card for upgrading the monitor microprocessor software. For this SD card, use the monitor microprocessor upgrading binary image file.

Upgrading procedure

To follow the monitor microprocessor software upgrading, the monitor screen upgrade progress indicator and the flashing power LED indicator can be

used.

1 Turn off the AC power (Unplug the AC power cord).

2 Insert the upgrading SD card (prepared as instructed above) into the service slot at the back of the set. Insert the SD card with its logo-printed face upward (visible). Be careful not to insert the SD card in the wrong way. Otherwise the card may come into the set and fail to come out.

3 Turn on the AC power (Plug in the AC power cord).

CAUTION: Now the monitor microprocessor software starts getting upgraded. Be very careful not to turn off the power while the software is being upgraded. Otherwise the software will fail to upgrade itself and the set will fail to get started.

4 A couple to dozen seconds after the set starts, the upgrade screen below shows up. The upgrade progress is indicated on screen. The power LED indicator goes out once and then starts flashing in blue. (It takes 2-3 minutes to get the monitor microprocessor software upgraded.)

5 If the procedure fails, the following upgrade failure screen shows up and the “NG” marking turns red. The power LED indicator fails to start flashing in blue. Even if the usual screen reappears in several seconds, do the procedure from Step “1” again.

NOTE: In case of failure, try to upgrade the software again. If it still fails, the hardware may be in trouble.

6 When the procedure is complete, the following upgrade success screen shows up. The new software version can be confirmed on screen. The upgrade success can also be confirmed when the power LED indicator and the OPC LED indicator start flashing alternately in blue and green, respectively. Double-check the upgrading and turn off the AC power (Unplug the AC power cord). Take out the upgrading SD card. Now the software has been upgraded.

Finally get the set started and call the process adjustment screen to check the monitor microprocessor software version.

Entering and exiting the adjustment process mode
1) Before entering the adjustment process mode, the AV position RESET in the video adjustment menu.
2) While holding down the “VOL (–)” and “INPUT” keys at a time, plug in the AC cord of the main unit to turn on the power.  The letter “<K>” appears on the screen.
3) Next, hold down the “VOL (–)” and “CH (Dn)” keys at a time.  (The “VOL (–)” and “CH (Dn)” keys should be pressed and held until the display appears.)
Multiple lines of blue characters appearing on the display indicate that the unit is now in the adjustment process mode. When you fail to enter the adjustment process mode (the display is the same as normal startup), retry the procedure.
4) To exit the adjustment process mode after the adjustment is done, unplug the AC cord from the outlet to make a forced shutdown. (When the power was turned off with the remote controller, once unplug the AC cord and plug it again. In this case, wait 10 seconds or so before plugging.)

Error codes / Power LED blinking codes chart

Click on the pictures to zoom in

CAUTION: Use due care in handling the information described here lest your users should know how to enter the adjustment process mode. If the settings are tampered in this mode, unrecoverable system damage may result.

To see the remote controller key operation and description of display in adjustment process mode, refer the above picture.

*Input mode is switched automatically when relevant adjustment is started so far as the necessary input signal is available.

Sharp LC-26P70EE. LC-32P70EE, How to enter the service mode, service mode adjustment details

Sharp LC-26P70EE/F/I/K/RU, LC-32P70EE/F/I/K/RU, LC-37P70EE/F/I/K/RU - DVB-T, PAL B/G, I / SECAM B/G, D/K, L/L’SYSTEM COLOUR TELEVISIONs

The adjustment values are set to their optimum at the factory before shipping. If by any chance a value should become improper or a readjustment is required due to part replacement, make an adjustment according to the following procedure.

[Be very carefull in handling the information described here, lest the users should know how to enter the adjustment process mode. If the settings tampered within this mode, unrecoverable system damage may result, means the main digital board have to be replaced.  Will cost much]

Entering and exiting the adjustment process mode
1 Unplug the AC power cord of TV set to force power off.
2 While holding down the “VOL (–)” and “INPUT” keys on the set at once, plug in the AC power cord to turn on the set. The letter K appears on the screen. (Factory mode)
3 Next, hold down the “VOL (—)” and “P ( V )” keys on the set at once. Multiple lines of orange characters appearing on the screen indicate that the set is now in the adjustment process mode. If you fail to enter the adjustment process mode (the display is the same as normal start up), retry the procedure.
4 To exit the adjustment process mode after the adjustment is done, unplug the AC power cord to force off the power. (When the power is turned off by the remote controller, unplug also the AC power cord and wait for 10 seconds before plug it in again.)
5 To remove “K” mode, just repeat steps 1 and 2. This time the letter K disappears from screen.

Remote Controller Key Operation and Description of Display in Adjustment Process Mode and Description of display

[Input mode is switched automatically when relevant adjustment is started so far as the necessary input signal available]

Adjustment process mode menu

The character string in brackets [ ] will appear as a page title in the adjustment process menu header.

White Balance Adjustment

Condition of the inspection: • Backlight: MAX (+8) [DYNAMIC]

Colorimeter at screen centre

Adjustment reference device: Minolta CA-210

Tolerance adjustment spec. ±0.004, Inspection spec. : ±0.006 (GAMMA 1)

Tolerance adjustment spec. ±0.002, Inspection spec. : ±0.004 (GAMMA 2...6)

1. Display the current adjustment status at point 6. 

The pattern for checking the adjustment status is toggled by pressing the “6” button on the remote control. (Normal)

OSD display -> “6” -> pattern for check (OSD disappears) -> “6” -> normal OSD display -> …)

2 Read the value of the luminance meter.

3 Change M GAMMA R6/M GAMMA B6 (adjustment offset value) on page 9/11 of process adjustment so that the values of the luminance meter approach x = 0.272 and y = 0.277.  (Basically, G is not changed. If adjustment fails only with R and B, then G should be reduced. In this case, the weaker of R and B must be fixed.)

4 If G is changed in step “3”, change the values of M GAMMA G1 - M GAMMA G5.

Process adjustment as follows. When not changed, go to step “5”.
Offset value of M GAMMA G1 = (Offset value of M GAMMA G6)*(160/960)
Offset value of M GAMMA G2 = (Offset value of M GAMMA G6)*(320/960)
Offset value of M GAMMA G3 = (Offset value of M GAMMA G6)*(480/960)
Offset value of M GAMMA G4 = (Offset value of M GAMMA G6)*(640/960)
Offset value of M GAMMA G5 = (Offset value of M GAMMA G6)*(800/960)

5 Display the adjustment status of the current point 5. (Each time the “5” button on the remote control is pressed, the adjustment status check pattern is toggled.)  (Normal OSD display -> “5” -> Pattern display (OSD disappears) -> “5” -> Normal OSD display ->…)
Change M GAMMA R5/M GAMMA B5 (adjustment offset value)  of process adjustment so that the values of the luminance meter approach x = 0.272 and y = 0.277.
6 Repeat step “5” for GAMMA points 4, 3, 2, and 1.

Adjustment: Check that the values on page 7/11 of process adjustment are set as below. If not, change them accordingly.

QS Temperature NVM Data Confirmation

During servicing of the LCD TV set , by software upgrading or by any cleaning NVM, it’s mandatory select the “Inch  Setting” according to the size of the TV set.

Lamp error detection

Functional description
This LCD colour television has a function (lamp error detection) to be turned OFF automatically for safety when the lamp or lamp circuit is abnormal.  If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed, the following occur.
1 The main unit of television is turned OFF 5 seconds after it is turned ON. (The power LED on the front side of TV turns from green to red.)
2- If the situation “1” happens 5 times sequentially, television can not be turned ON. (The power LED remains red.)
Countermeasures
When television is turned OFF by the lamp error detection mentioned above, it enters the adjustment process with the power LED red. Entering the adjustment process turns OFF the error detection and turns ON TV. This enables the operation check to detect errors in the lamp or lamp circuit.  Check whether “L ERROR RESET” on point 7, page 10/11 of the adjustment process is 1 or more. If it is 1 or more, it indicates the lamp error detection was executed. After confirming that the lamp or lamp circuit is normal, reset the lamp error counter pushing “OK” in the R/C. After resetting counter the label “***OK***” appears on Screen.
Reset standby cause error list
After confirming that the lamp error counter has been erased, select “STAND BY CAUSE RESET”  of the adjustment process and select ON using the right cursor. For execute press “OK” in the R/C and the label “***OK***” appears on Screen.

Public Mode (Hotel Mode)
How to Enter in the Public Mode (Hotel Mode).
Turn on the power in analog TV mode and enter in the Adjustment Process mode (ADJ1 or Service Mode) as usual.
Turn off TV by pressing Main Power switch.
While pressing “VOL+”and “P^” keys at the same time, press Main Power switch for more than 2 seconds.
After this sequence the TV will turn on showing the Public Mode setting.

Philips 21 inch CRT TV – Service mode, factory mode, fault detection, Schematic

Used ICs: TDA98XX, TDA486X, W6554A (STR), DM837X, TDA9842AJ, TDA98XX

[If you feel any difficulty to see the diagrams, please take a magnified printout. See this post by desktop computer.]

Service Modes, Error Codes, and Fault Finding

This chassis does not contain a specific Service Mode. Service and Alignment of the TV set can be done via the Factory Mode by the service technician.

Power on Failure
Check whether the power supply is working properly and whether the values of voltages normal. If those are correct, check line transistor and transformer are working properly and check fore or back line for defects.

Horizontal Deflection Transistor Defective: No Picture, No Sound.

To find the fault for a defect with horizontal deflection transistor check the following items:
• Over voltage to breakdown.
• Over current to burn.
• Horizontal frequency too low or very high.
• Horizontal drive inefficient.

Picture Interference
• Check if the signal line contact is good.
• Change Tuner if is necessary.

Can't find any TV program
 Check the closed circuit from tuner to picture decoder IC to detect whether there are defective components. 

Check whether the resistance of R117, R118, R203 and R204 has increased which also could cause the problem.

No Good Picture or Double Image
Check the correctness of the signal from IF1/IF2 to Q101 and relevant circuit. 

In this case the problem can be Q101 and/or SAW101

Picture not or incorrect Colored
• Check the circuit from IC201 to R.G.B. three gun circuit.
• Check the IC soldering and relevant circuitry on physical damage or check for defective capacitors.

Picture with Horizontal Bright Line and Sound
Check both supply voltages of vertical IC301 and relevant circuitry for correctness. Also check the vertical synchronizing signal from IC201

Remote Control Malfunction
Check the voltage on pin 64 of IC201. 

The normal value should be 5.15 V. 

If this is correct check front control panels soldering connections. 

If can't be solved, check the remote control, crystal or transmitting diode of the remote control are in good condition.

No Sound
Check power supply of sound IC (IC402) and relevant circuitry (not exclude IC402 to be defective) or change speakers

Poor Sound Quality
Check the sound system after searching the channel which should set at DK, I or AUTO. 

If still has problem, check accompany board circuit on chassis good or not.

Main Voltage Adjustment
In order to adjust the main voltage, connect a voltage meter to the cathode of diode D610, and adjust VR601 to a voltage of 110 V ±0.3 V

To Put the set in its MENU mode (factory mode) as follow

Rf AGC Voltage Adjust
1. Provide a 475.25 MHz, 60 dB half colour bar signal.
2. Enter factory mode and press key 4.
3. Measure tuner AGC point voltage, adjust AGC item till the voltage is 2.4 V, or till picture noise just disappears.

Focus Fine Adjust
1. Provide a cross-hatch pattern signal.
2. Set state to dynamic.
3. Adjust flyback transformers Focus knob till picture is clear.

Screen Voltage Adjust (Key 0).
1. Set picture to “Standard” mode, without signal input.
2. Enter factory mode and press key ”0”. There will be a level bright line displays

Adjust flyback transformers Screen knob till the level bright line just can be seen, press PROG+ and turn to other factory menu.

Horizontal Adjustment (key 1)

1. Provide a 50 Hz monoscope pattern. Put the set in the MENU mode. Press key 1 to enter factory mode.

2. Adjust 5HSH (for 60 Hz picture, its is 6HSH) to set picture horizontal centre to CRT horizontal centre.

3. Provide a 60 Hz monoscope pattern. Put the set in the MENU mode. Press key 1 to enter factory mode.

4. Adjust 6HSH to set picture horizontal centre to CRT horizontal centre.

Vertical & YUV/RGB Horizontal Adjust (key2)

1. Provide a 50 Hz cross hatch signal, set TV to standard mode. Adjust 5VSL so that half picture of the pane cross appears. The picture’s vertical line is just at the bottom of the half picture. Adjust 5VSL to make the centre of the picture’s vertical line and the kinescope are in superposition.

2. Adjust 5VAM to obtain picture’s vertical re-display ratio more than 90%.

3. Provide a 60 Hz cross hatch signal, do step 1 and 2 again to adjust.

4. If necessary, fine adjust above items.

5. Provide a 50 Hz RGB or YUV cross hatch signal, set the TV in the standard mode, adjust 5RGH till picture horizontal centre is at the CRT centre (optional).

6. Provide a 60 Hz RGB or YUV cross hatch signal, set the TV in the standard mode, in the factory menu, adjust 6RGH to make the pane cross vertical center at the center of the screen (optional).

OSD Position
1. Menu OSD position adjustment: Provide a 50/60 Hz cross hatch pattern. Put the set in MENU mode. Press key 2 to enter the factory mode. Adjust 5VOF/6VOF and HOF item, to obtain menu OSD at the centre of CRT screen.
2. LOGO position adjustment: Provide a 50/60 Hz cross hatch pattern. Put the set in MENU mode. Press key 7 to enter the factory mode. Adjust XMIN, XMAX, YMIN and YMAX, to obtain LOGO at the centre up to 1/3 of CRT screen.
3. Teletext OSD position adjustment: Provide a red signal in the standard mode. Press key 7 to enter the factory mode.
Adjust TXMI and 5TYM/6TYM to obtain index at the centre of screen.

White Balance Adjustment (key 3)
Normally, this chassis can auto adjust white balance, but for some CRTs it a necessity to adjust white balance carefully by hand. Set Brightness and Contrast at normal status, provide a greay scale test pattern and from the MENU mode press key 3 to enter the factory mode. Set WPR at 31, adjust WPG and WPR to obtain white balance.

To Enter Factory Mode    Click on the pictures to magnify

Circuit diagram (Schematic)

E2PROM Initializtion (key 8)

An empty or used E2PROM can be used for servicing. 

The following steps have to be passed through to initialize the E2PROM.
While in the MENU mode press key 8 to enter the factory mode.
Now enter the initialization menu by pressing the < / >.

The set shows the OSD ”INIT BUSY” on screen, 5 minutes later, the text “BUSY” disappears. Now power OFF and ON the set. 

This finalizes the initialization.

Function Settings (key 5)

1. While in the MENU mode press key 5 to enter the factory menu.
2. The Logo setting is used when powered on or no signal.
Press MENU in the factory mode to enter the compile mode, there are to rows. 

The first can set the customer’s name etc. 

The second row is intended to display the customer’s e-mail, telephone etc. 

Press L / R  to select the character to edit. Use keys Up / Dn buttons to choose the character.
Press MENU again to exit this view.
3. Set values for Option 1 to Option 8

LG CM6520 Mini Hi-Fi System – Schematic – Power supply, RF servo, DSP - Main amp – SMPS Power supply troubleshooting

No power

Fuse & bridge diode
Check and replace F901, BD901, TH901, TH903 on SMPS board.

Check if the fuse F901 has open or short-circuit.

Check if the bridge diode BD901 has short-circuit by over current, with a multi meter.
Check if the NTC thermistor TH901 and TH902 is normal or open.

Click on the pictures to magnify

The unit doesn’t work, no power problem

Check the Anode-Cathode Voltage of D951 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.   If it doesn’t have any voltage, it has been damaged.  Replace it with a new one.
Check if ZD951 is short-circuited.   

If it has short-circuit,  replace it with a new one.

Click on the schematics to magnifty.

Can take a magnified printout of these circit diagrams.

[See this post by desktop computer, or see it by web View on mobile.]

SMPS Circuit diagram

DSP (Digital Signal Porocessing) schematic

Micro-controller (MICOM) schematic

PWM Schematic

Servo schematic

Main amplifier schematic

How to re-assemble the CD changer mechanism – LG CM6520 Mini Hi-Fi system - cabinet exploded view

Be very careful when re-assembling the mechanism. Note the gear mechanism teeth positions. Even a slight change in teeth positions of the gear wheel might make serious damage to loading mechanism, when you Power ON the set.  
ORDER OF ASSEMBLY FOR MECHANISM DECK - Mini Hi-Fi System LG CM6520

Assemble the Loading Motor Assy to the Base Main.

(When assembling the Motor Assy, use the hook on the surface of the Base Main to preassemble, and then tighten the screws.) even a little change in the positions, might make more complicated damage to mechanism, when you power ON the set. Make a double or triple check, before power ON the set, after mechanism repair.

* Set the Guide UD on the Base Main.

* After setting the part, push it in direction 3. 

  Click on the pictures to zoom in

* Set the Gear Loading 1 and Gear Pulley 2 on the Base Main.
* Hang the belt between the Gear Pulley and Motor Pulley.
* Assemble the Clamp Disc, Clamp Magnet and Cover Plate to the Base Main.

->After setting the Gear Main 2, Gear Pu Up 3 and Gear Pu Down 4 on the Base Main, tighten the screws.
* After assembling the Gear Main, align the location as shown in Figure.

* After setting the Main PCB Assy on the Base Main, tighten the screw. (Set the part accurately on the hook)
* Solder the Motor Jump Wire on the PCB set on the Base Main.

* Set the Base Sled Assy on the Base Main.  (When setting the part, assemble with the CAM part of the Guide UD inserted in two locations of the Boss of Frame UD)
* Align the FFC to the Guide and connect the Harness Cable.

* After setting the Gear Tray, Tray Motor Assy and Loading PCB Assy on the Tray Loading, tighten the screw

* Assemble the Gear Tray CAM on the Tray Loading and set the Tray Disc.  (When assembling, check the location of the Gear Tray CAM and Tray Disc as shown in the Figure)

* Assemble the Tray Loading Assy on the Base Main Assy as shown in the Figure.
* After assembling, insert the Loading FFC to the 5 Pin Wafer of Main PCB Assy.

* After setting the Cover Guide Disc, tighten the screw.

Main cabinet exploded view - LG CM6520 Mini Hi-Fi System

LG CM6520 (CM6520, CMS6520F/W) – How to disassemble the CD changer mechanism - Mini Hi-Fi System

Compact disc players incorporate many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care.

DISASSEMBLY AND ASSEMBLY FOR MECHANISM DECK (CDM-H1803)

* Disassemble the Cover Guide Disc.

* Disassemble the Loading FFC from the Main PCB Assy.
Turn the Gear in OPEN direction as shown in Figure to take out the Tray Loading Assy in 3 direction.

* Pull up the Holder 1 to completely disassemble the Tray Loading Assy from the Base Main Assy

* Loosen the screw to pull up and disassemble the Tray Disc

* Loosen the screw to pull up and disassemble the Gear Tray CAM

* Disassemble the Gear Tray, Tray Motor Assy and Loading PCB Assy from the Tray Loading.

* Disassemble the Harness Cable from the Base Main.

* Disassemble the Base Sled Assy from the Base Main by referring to Figure.

* Push the Guide UD in direction 1 to disassemble it from the Base Main.

* Disassemble each gear part, Clamp Disc, Clamp Magnet and Cover Plate from the Base Main.

* Disassemble the Loading Motor Assy by being careful of the hook on the surface of the Base Main.

LG Mini HI-Fi system CM6520 (CM6520, CMS6520F/W) - DECK SECTION (CDM-H1803) – Exploded view

TCL 32D2930 LED LCD TV – how to enter the service mode, service adjustment details

TCL 32D2930/MT56E1-LA - LED LCDTV -service mode, factory mode, software update, white balance adjustment and other service adjustment details.

When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer that have the same characteristics as the original part. Unauthorized substitutions may result in fire, electric shock, or other hazards.
MT56-AP chassis are designed for Asia & Pacific (AP) market Ready for Smart TV. 

It features by its high integration, easy debugging (ADC adjustment free) as well as convenience in terms of maintenance. 

Fast software upgrade through USB disk facilitates both manufacture and after-sale service.
Factory Main Menu (FMM) is divided into Factory menu and Design menu. 

Factory Menu covers all indispensable functions during manufacture such as White Balance Adjustment, SHOP etc., while Design Menu includes Service Menu, Hotel Menu, Param Setting, Other Setting etc. Some settings like Param Setting and Other Setting is exclusively used by R&D engineer, anyone else shouldn’t change the settings in the menu. When you wish to learn the product information like project ID, project name, Hardware, software version, releases date, you can access to Service Menu.
The main chip is from REALTEK
Factory Menu: Accessing Way
a. When the Factory hotkey item of Factory Menu is disabled (OFF), press Menu button of remote control, then select Settings/Picture, make sure the cursor stop on Contrast item submenu. 

Finally, press 9, 7, 3, 5 consecutively.
b. When the Factory hotkey item of Factory Menu is enabled (ON, you can see the flashing Factory Captions Info on the lower left corner), press Back button of remote control.
Press RCU “OK” key to enter the submenu.
Press RCU “Right” or “Left” key to change the values.
Press RCU “Right” or “Left” key run the function.
Press RCU “Back” or “Menu” key exit the Factory menu.
While “FactoryKey” is enabled, there is some toggled display information relative to MV, SV, ID, MID, to facilitate 100% quick screening without accessing to whatever else menu

Design Menu
Design Menu includes Factory Menu, other, Service Menu, Param Setting, Hotel Menu.
Some settings like Param Setting and Other Menu is exclusively used by R&D engineer, anyone else shouldn’t change the settings in the menu. When you wish to learn the product information like project ID, project name, chassis name, software version, release date, you can access to Service Menu. 

In addition, in Hotel Menu, provides a great deal of useful functions for specific applications in hotel.

Accessing 
a. When the Design mode hotkey item is disabled(OFF), press Menu button of remote control, then select Settings/ Picture, make sure the cursor stop on Contrast item submenu, press 1, 9, 5, 0 consecutively.
b. When the Design mode hotkey item of Design Menu is enabled (ON, you can see the flashing Factory Captions Info on the lower left corner), press Back button of remote control.

* Press RCU OK key to enter the submenu.
* Press RCU Right/Left key to change the values.
* Press RCU Right/Left key run the function.
* Press RCU Back/Menu key exit the Factory menu.
Design Captions Information is the same to Factory Captions Informations.

Other Menu
The Other Menu contains some TV basic informations, with which help to check the TV setting before production.

Service Menu
Service Menu contains some basic information of the device, such as Project ID, Hardware, Software version, USB Update etc. 

This menu is especially useful for after-sale service.

Param Setting Menu
Param Setting menu contains Sound Setting, Picture Curve, Picture Setting, SSC, DBC, CI Card, Overscan, WIFI CHECK and USB FILE. 

But it is exclusively used by R&D engineer, anyone else shouldn’t change the settings in the menu.

Pre-Conditions and Power Supply Check

Before power-on, check the board according to the relevant block diagram and circuit diagram, make sure that no serious issue or mistake can destroy the board. 

For example, the output of DC/DC and LDO should not be shorted to ground.

Supply a suited voltage and power-on, then check the voltage according to the relevant block diagram, circuit diagram and voltage spec, the error should be less than 5%, for example, the voltage for main chip (+3V3, +2.5V, VDDC1V15, 1V5_DDR, etc.), the voltage for TUNER (TU_3V3), the voltage for amplifier (AMP_VCC), etc.

Refer the below given chart.

Project ID Modification

There are different ID stored in the EMMC depending on different Panels settings and Model features, but there’s only one key branching Project ID able to ensure normal display; and when you power on the TV set, you should make sure the Project ID is accord with the BOM description. 

If not, you need to modify the ID. There are two methods to modify the ID:

Change Project ID in Design Menu

In case of “Design mode hotkey” is enabled, press “Back” button to enter Design Menu. 

To modify Project ID, you need to go through “Service menuàProject ID”, then press Left or Right key to select suitable ID (Project name is dynamically refreshed). 

Finally restart the TV set.

In case of “Design mode hotkey” is unabled, you can enter the Design Menu easily with reference to 3.1 Design Menu.

Change Project ID with Remote control unit

Press “062598”+”Menu”+”XXX” (XXX represents project ID you’d like to switch to) in the remote control and wait about half minutes,when the set restart automatically, you have successfully changed project ID

below is none exhaustive ProjectID table for reference

Function Test
Once the Project ID is correct and the TV display normally, plug all external generator devices to relevant inputs/outputs below according to their respective test patterns format and check picture content and sound quality accordingly.

LAN/WLAN Test

MAC Address Upgrade

Upgrading MAC address needs to use the tool in factory and through serial command. 

The specific method is according to the operation of the factory guidance.

Device ID (DID) and User ID (UID)

Purpose is to allow Other Network Download (OND) and further specific services over dedicated portal based on AP. For such, specific DID (32 bytes) and UID (8 bytes) needs to be paired and overwritten into memory for internal client encryption, as below.

Those DID/UID codes can only be set using UART commands following enclosed SIACP requirements.

LAN Test
A rough LAN test can be done by connecting Ethernet to TV’s RJ45 and check that IP, subnet mask, DNS addresses, which are visible on Home>Settings > Network >Ethernet > IP settings” 

(ensure that “Internet Connection” is Enabled at first). 

More in-depth test can be performed faster using suitable UART/IR commands following SIACP requirements. SW will internally manage Network ID (NID) flag controlling all MAC/DID/UID integrity to facilitate PA screening further.

SHOP INIT
At final process stage, it’s necessary to perform Shop 'init' before any packing to leave Factory mode and restore User default presets according to the requirement of order.
This function is accessible by selecting “Factory Menu > Shop”, then pressing RCU “Right ”or” Left” key.

Warm-up Test

It’s required minimum 15min of Warm-Up that can be considered as Burn-In. Additional aging for White Balance alignment is no more necessary due to consistent picture performance with cloning usage. 

This function is accessible by selecting “Factory menu  - "Warm up”, pressing RCU “Right” or ”Left” key to set it ON, and then it enter in Warm up mode. Press “Menu” key on keyboard to exit the burning mode.

Software Upgrade: How to upgrade Mboot

Connect the computer and main board VGA port by a serial port tool.

Serial connector definition: VGA/P303: Pin4: RXD VGA Pin11:TXD

Open MTK “Mboot” software programming tool “Flash Tool”, and set serial port.

Import the mboot file. 

Power on the TV, then Click Upgrade key and you will see the below screen message

How to upgrade FLASH Software

USB Upgrade

Download the update file (generally named V8-MT56551-LF1VXXX.pkg) to the root directory of your USB device, and make sure there’s no other bin file named analogously. 

Then insert the USB device to USB interface of TV set.

Power on the TV set, 

Press and hold on the menu key of key board and on the set at the same time. 

If the TV is updating, you’ll see the upgrade screen.

Upgrade process takes about 3 to 5 minutes.

After updating, the TV set will reset automatically.

Online Upgrade

Download the bin zip file “V8-MT56551-LF1VXXX.Zip” to the root directory of your USB device, and do not change the file name. 

Then insert the USB device to USB interface of TV set.

Press RCU Menu/Settings/Picture/Contrast/1,9,5,0/Service menu/USB Update /Main Upgrade/Local Update . 

If the upgrade file is found, TV will give a message that it verifying. 

TV displays a warning message, it means selecting “confirm” to continue or “cancel” to exit.

During updating, do not power off the TV set.

After updating, the TV set will resrart and reset  automatically.

Network Connection

You can set up your TV so that it can access the Internet through your local area network (LAN) using a wired or wireless connection.

Connect to a wired network

Attach the TV set to your LAN using cable in three ways:

  Connecting the LAN port on the TV to an external modem using a Cat 5 cable

  Connecting the LAN port on the TV to an IP Sharer which is connected to an external modem. 

Use Cat 5 cable for the connection.

Depending on how your network is configured, you may be able to attach the TV to your LAN by connecting the LAN port on your TV directly to a network wall outlet using a network cable. Note that the wall outlet is attached to a modem or router anywhere in your house.

Select Home→ Settings→ Network → Ethernet Settings→IP Settings, then the TV will obtain IP address Automatic configuration. 

In addition, you can set the IP address and password manually.

Connecting to a wireless network

To connect the TV set to your network wirelessly, you need a wireless router or modem and a Wireless LAN Adapter.
If the TV set is equiped with an internal WiFi module, select Home→ Settings→ Network→ Wireless Settings, then turn on Wireless Switch, select a wireless network and press OK to connect.
If you want to connect the TV set to a wireless network by a Wireless High Gain USB Adapter (USB dongle), select Home→ Settings→ Network→ Wireless Settings, then turn on Wireless Switch and External WiFi, and select a wireless network and press OK to connect.

White Balance (WB) Adjustment

The White Balance generally is customized by PQ engineer, and uploaded to the PDM system, anyone else shouldn’t change the value in the menu. If it is necessary to adjust, the following content can offer some reference, but the process of adjusting White Balance is out of the range of this file. Refer to the relevant technical file of HuiZhou factory of TCL

Calibration of Color Temperature
According to TCL standards, the color temperature and white reference coordinates of LCD like the following table: (This standard is based on CA-310 color temperature meter)

White balance adjustment takes the Normal color temperature of HDMI channel as the reference

Warm and Cold tone is relative to Normal mode. The adjustable gain range is 0~255

The Normal color temperature of other channel is relative to the Normal mode of HDMI channel. The adjustable gain range is also 0~255

The manual adjustment is according to the regulation above. Additionally, when manually adjust, it needs to do White Balance in it first.

Take signal generator 22293 as an example, the timing value and pattern value of each source show in the following table.

Click on the pictures to magnify