Question about LG DU-42LZ30 42 in. LCD HDTV

4 Answers

Hidden or Service menu

I have this model of LCD TV. I want to open its hidden menu/service menu. Please anyone tell me how to open it?

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  • siddiquenu Jan 10, 2008

    We are a software company. We are developing an application to communicate on serial ports with LG LCD TV; model number RT-42LZ30. The application is using RS232 communication standard. The idea basically is to control the functions of LCD with a PC. PC will send commands through RS232 serial ports to LCD to perform different tasks e.g switch on, off, volume level etc.







    we have consulted owner’s manual. We are setting up everything as this manual says. We are presenting you all the parameters we have used in this task:







    · We are setting communication parameters as under:







    Baud rate : 9600 bps (UART)



    Data length : 8 bits



    Parity : None



    Stop bit : 1 bit







    · We have tried D Sub 9 Pin both( 7-configurations crossed and 3- configurations crossed) cables to communicate with PC connecting female side with PC and male side with the LCD.



    · From the LCD menu we have set the “Set ID” to 1 as described by the manual.



    · We are using the same format of commands written in the manual. For example to power off the LCD we are using “ka 1 0







    But when we send command on the port, neither any response comes nor any effect on the LCD occurs. We have checked the “DSR” and “CTS” pins after connecting with the LCD, but they are false.







    Furthermore, we have used the same parameters and cable for PC to PC communication, everything goes fine. Also “DSR” and “CTS” pins are true.







    Besides our application, we have tried many built and tested applications from the internet. For example you can consult one and download trial version from:



    http://www.mpsav.com/MPS_CommTester/MPS_...







    We are sure that there is no issue in the software because there is no communication through HyperTerminal(a windows XP built-in serial communication tool found in Programs->Accessories->communications->HyperTerminal).







    We have searched from the internet that the port should be enabled from the service technician’s menu to make it work. This is its link:



    http://www.girder.nl/forums/showthread.p...



    But this link tells about some other model.







    So Please tell us how to open the service technician’s menu and enable the port or guide us if we are doing something wrong in our process.

  • Anonymous May 05, 2008

    i have the same problem, do you resolve this? do yow have the solution?

  • Anonymous Mar 29, 2009

    no pic

  • Anonymous Mar 18, 2014

    hidden channels

  • Anonymous Mar 24, 2014

    When I turn on my TV with my ATT&T digital box the Home Menu opens. After exiting, 1 minute later the Home Menu opens up and it continually opens every 1 minute.

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Thank of you but i need access to menu service please help me
please mail key to access to menu service
thanks of you

Posted on Jun 09, 2008

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The service menu contains nothing that the average consumer needs to get into. We technicians don't use I would say 99% of the service menu items. I would stay out before non reversable damage could happen.

Posted on Jan 08, 2008

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Wanna know more about LG LCD TV's send email @ daniyalm22@yahoo.com

Posted on Feb 07, 2009

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1 Answer

How can I open the service menu?


Press the helpful button and check link below for various models

First power off your TV using the remote, then press following buttons quickly on your TV remote:
Display (or i+) + 5 + Volume Up + Power
It'll show the hidden service menu on your TV screen.
Once you enter into service menu, you can press Menu (or Options) button again on your remote to switch between various service modes such as Digital, Chassis and VPC.
To navigate between available options press 1 or 4 buttons. To change or modify their values press 3 or 6 buttons.
To save your changes, just press Mute + 0 (or Enter) buttons on the remote.
To restore settings to factory defaults, press 8 + 0 (or Enter) buttons.
PS: For some new models the above mentioned method might not work. You can try following key sequence to access service menu in those new models:
While TV is on, press Left + Right + Mute + Center button + Mute + Menu buttons.

Hidden Secret Service Menu Codes for Sony Samsung LG and Philips TV
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If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response

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I think this is the area you are refering to..

If not shoot me LOL..

Let me know ok.

The Hidden Service menu provides access to a large group of information pages and functions usable for diagnosing and correcting system malfunctions and accessing special features. Display the Hidden Service menu as follows:
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