Question about LG Projection Televisions

8 Answers

I have an LG 44inch DLP TV. Ihave had it for about 5 years. Recently the lamp blew and I fitted a replacement. After switching back on, everything was fine for twenty minutes, Then thin white vertical stripes appeared across the screen and would not go away. Can you tell me what needs to be done Please.

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  • Tallawong Jul 06, 2008

    I have tried the cleaning connections idea. This did not work. After 40 minutes, the pin stripes overlaying the picture returned.

  • Tallawong Jul 06, 2008

    I have used different signal cables, and a different signal source. The picture is as you have described, like looking at a picture through white prison bars. But this fault only happens after the set has been on for some time, which may indicate a fault thatis of a thermal nature.

  • Tallawong Jul 06, 2008

    This has been done at the very start of the fault investigation.

  • Tallawong Jul 06, 2008

    I have tried cleaning all cables and connections, to no avail.
    I am convinced that this is an internal problem.

  • Tallawong Jul 06, 2008

    The lamp that I have replaced is an exact replica of the original lamp in every respect, including the manufacturer. I am an Electrician by profession, so I do have some idea of what I am doing, when it comes to replaceing lamps.

  • Tallawong Jul 07, 2008

    The lamp is fine. Tell me more about this convergence theory.

  • Tallawong Jul 08, 2008

    There is nothing wrong with the lamp or the power supply.

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Contact LG for service. we can't perform miracles over the internet.

Posted on Jul 08, 2008

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Just check if the lamp is good and don't have any problem and then go for power checkup..it might be because of bad power..

Posted on Jul 07, 2008

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  • LG Master
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Check if the lamp you mounted is blown again.
The most likely is that the small pcb that power up the lamp is blown.
You need to test the board with a multimeter, If the pcb is fine (I doubt from description), you may just need to perform a service convergence procedure.

Posted on Jul 06, 2008

  • Ginko
    Ginko Jul 07, 2008

    Convergence setup is not a theory it is a service

    procedure that repairman ordinarily do whenever there is a convergence problem, you need a service remote (original remote is enough on some model) and to perform the service procedure illustrated on the service manual for your model.
    Service procedure should not be used unless you know what you are doing, as in service mode you can cause serious problem to your tv.
    If your TV had been fine for twenty minutes or so before giving you the problem, this means it is not a setup problem.
    Something had just blown after 20 minutes, could be some component on the board that control the lamp or some IC on main board has blown.
    On las pages of your owner manual you will find LG phone number to call to have your TV serviced.

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Sir
i think the lamp u replaced is not compatible with your tv. this is the reason behind produceing stray capactance which disrupts the cell column..
do chek for an update in the lamp.

Posted on Jul 06, 2008

  • Harrish Mugundhan Jul 06, 2008

    sir i read this article



    "I've had the set in the shop 3 times now for this problem. Originally the set didn't have this problem. I had a small white line, that I really didn't notice unless the TV was just turning on and powering up... should have just let it be, but I figured it was the start of something worse so I called LG for service. The Tech changed out a bulb, then a circuit board or something or other, and then everything inside the unit. What are my options now? LG has sent out techs but they look at the TV when it's on a program like the news or the weather channel. I don't have problems with bright programming and the Techs are reporting to LG that their aren't any problems with my set. I'm at a loss here""





    NOTE : ITS BETTER TO CALL LG TECHS TO ATTEND THE PROB

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Try reseating all of the cables and connectors. This is a communication problem between the processing board and the display or the display is bad.

Posted on Jul 06, 2008

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Remove the lamp and clean the lamp and make sure there is no dust on the lamp install it back.....................

Posted on Jul 06, 2008

  • Anand Kumar
    Anand Kumar Jul 13, 2008

    If you would like to attempt a DIY, you will need a service manual to guide you. You can find one here:
    http://servicemanuals.vstore.ca/



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Is this appear like think solid vertical bars??

is it appear like the whole picture running behind the bars??

Posted on Jul 06, 2008

  • 2 more comments 
  • dewan nafees ahmed Jul 06, 2008

    if yes then you you actually need any one of the following options


    • a different connector that brings in the signal

    • a different signal cable.. if these 2 don't work then you need

    • a color wheel position adjustment


  • dewan nafees ahmed Jul 08, 2008

    this will be a convergence problem i guess.. have you replced the convergenc ICs?

  • dewan nafees ahmed Jul 08, 2008

    also are the lines black in color or in various colors?

  • dewan nafees ahmed Jul 08, 2008

    for example if yopu see blue lines



    do as said here



    the lines are most likely the panel which isnt cheap
    the blue speckles are just a voltage adj. on the y sistain if you feel confident enough you could try this yourself(though expensive equipment is usually required i do without). what you would have to do is take off the back panel if you have a stand put it back on that. easier to work on. then plug it. BE CAREFUL not to touch anything inside!!! from the back you will see a board on the left side on that board will be a small board attached vertically it will have a gray screw attached(very small). with the tv on you adj. the screw until the blue goes away(a little does alot).

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  • 417 Answers

Tyr Removing the Lap And Cleaning the Terminals Which The Lamp Plugs Into

Posted on Jul 05, 2008

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    1. Ensure that the TV is off. It may be advisable to unplug the TV as well.
    2. 2 Using a Phillips screwdriver, remove the single screw affixing the lamp cover (the small, grill panel on the back of the set) to the chasis. There is also a grill that is held in place by tension. Just "pinch" the thumb clamp on the bottom of the grill and slide it out. This is the same procedure you would perform to change the lamp, except in this case you will not need to remove the lamp itself.
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  • 5.Check some basics first. Make sure the sleep timer on your TV hasn't been turned on, telling your set to turn off at a certain time. If your DLP TV is acting erratically, Samsung recommends turning the set off and unplugging it for 30 minutes. After 30 minutes plug it back in and turn it back on. Unplugging the set resets it, and that may fix the problem.
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  • 7 Replace the lamp. If your Samsung DLP is shutting off or won't turn on, a bad lamp is the most likely cause. To replace the lamp, remove the lamp cover from the back of the TV by removing the screws with a Phillips screwdriver and slide it out and away from the TV. Remove the screws on the lamp assembly and slide it out of the TV. Disconnect the old lamp and insert a new lamp into the assembly. Slide the assembly back into place and replace the screws. Do the same for the lamp cover.
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  • The safety switch exists so the user does not accidentally remove the lamp door while the TV is on. Doing so could, theoretically, result in burn or electrocution. This spring loaded switch causes the TV to shut down when the door is opened.
  • Since the TV's chasis is plastic, expansion and contraction can cause the switch to lose firm contact with the lamp door. The TV's behavior could then be such that after being on for a while (getting warm) the plastic expands and the switch loses enough contact to cause the TV to shut down. The frequency with which this phenomenon occurs is not only dependent on the internal temperature of the TV, but also the ambient temperature of the room as well as the relative tension on the switch itself. The user's perception is that the TV starts up fine, but then "randomly" turns itself off after being on for a while.
  • If you have recently moved your TV, it is very common for random shut-downs to occur. This is because the move has shifted the flimsy plastic chasis of the TV, thereby loosening the contact between the lamp door and the switch.
  • Make sure your TV is off and cool when performing this procedure.
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    1. Ensure that the TV is off. It may be advisable to unplug the TV as well.
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  • The safety switch exists so the user does not accidentally remove the lamp door while the TV is on. Doing so could, theoretically, result in burn or electrocution. This spring loaded switch causes the TV to shut down when the door is opened.
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