Question about Projection Televisions

2 Answers

LG LFD 790 Multipl weird problems. I have had this compact home theater system for a little over a year. Several months ago, the DVD player began to inexplicably freeze and would not continue until you turned it off and waited a while. This behavior is intermittent, and sometimes happens again and again in a session until you get frustrated and turn it off for the night. Other times, it's a one time thing in an evening. Other times it doesn't happen at all. I have put a small high speed personal fan behind the unit, and this may have reduced the frequency, but it has done this several times since placing the fan. Next, a few days ago, my wife tells me that she came downstairs and the speakers were making a poo-poo-poo-poo sound. She recalls that the picture was on but doesn't recall if there was TV sound along with the beating sound. I recall a similar thing from a component stereo system we once had. The difference is that it would happen when the stereo was off.I needed to unplug the whole thing to make it stop. My wife says she simply turned off the TV to make this stop on the LG. Last night, we were switching around while watching a DVD, and suddenly the picture went off, but the sound stayed on. Then as we fiddled around, both picture and sound went off. ****Keep in mind that we have to use three remotes right now--the one for our ATT Uverse. We use it to change from mode to mode on the Uverse receiver, and to change channels. On the remote for the older Magnavox TV, we use the who/input button to change modes within the TV.(The TV has no USB but has game attachments on the front. It's a "tweener" age wise). The third remote is the LG remote. We use it to adjust the volume, mostly, and to change the settings of the LG unit. Weird stuff happens with sound and picture occasionally, and we usually just need to decipher the combination of button pushes and remotes, to correct the problem. This morning, I was able to work through and we have both sound and picture accross modes. BUT the cool florescent display "circles" that this unit features on the bass unit and on the main cabinet, are OUT, and will not relight. These ordinarily come on ONLY when the power to the LG is on, and they go out only when the power to the LG is off. Right now, the power to the LG is on and the circles are still unlit.I have turned it on and off a couple times and they still stay unlit. I have wiggled cables all around, and nothing has changed. If you could solve the freezing problem, or let us know where the problem lies for repair, that would be great. The other stuff we'll consider a bonus! Thanks, and good luck! buese@sbcglobal.net

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  • 2 more comments 
  • buese Nov 01, 2008

    The noise that the unit is making is a beat, like a muffled drum. It's not like static or a hiss.

  • buese Nov 01, 2008

    i have recieved ideas on the TV and about the sound on the speakers. What about the LG itself. I am guessing (and only guessing) that the LG is the problem. The DVD feezes, and the disply lights are out. The DVD player is part of the LG unit.

  • buese Nov 01, 2008

    bappa suggests contacting LG support. Any other suggestions or theories?

  • buese Nov 01, 2008

    bappa did a great job. I was hoping for some sort of external fix--move this cable over here, then turn the unit upside down...I kindof thought it would be an LG support problem. Thanks!

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The TV is going in protect mode because it detects an internal problem, try leaving it unplugged for a longer time, let say one hour or two.
Basically, what happens is that the TV does not start because it detects that there is an internal problem, such as a wrong voltage, a bad component, overheating etc.
When you unplug power and restart it, you reset the internal circuit, and the TV will restart, not detecting the internal problem.
As soon as the TV gets hot, after staying on for a while, the defective part start giving troubles, as the defective component (probably an IC, starts overheating).

From description, the digital processing board. can be cause for the problem as there is no video.
However all the following parts can be involved.

Parts involved can be

Polaroid digital processing board.
Polaroid replacement ballast.
Polaroid Replacement LCD controller

Its time to get it repaired.

Thanks

Posted on Nov 01, 2008

  • Indrajit Roy
    Indrajit Roy Nov 01, 2008

    As you have mentioned that the DVD unit is a part of the LG system so I would advise you to contact LG first. There customer service and technical support is excellent.



    Thanks

  • Indrajit Roy
    Indrajit Roy Nov 01, 2008

    I would never adivse you to open the unit yourself because a minor problem can become a major problem as now a days every conection is integrated on a single board.



    Thanks

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Try first unplugging power cable , and see if this can reset the unit.

Posted on Nov 01, 2008

  • Ginko
    Ginko Nov 01, 2008

    If the noise is like static, then it is a lose contact or a faulty component, if it is a loud humming noise, then it is probably a short inside the TV or a faulty component inside the TV.

    Try unplugging power canble for at least one hour, and see if this can reset the unit, in case was a jammed component, or an electrostatic charges problem.

    If that does not solve the problem, that means that the unit is faulty.

    In this case the TV must be taken apart, wiring to speakers tested for shorts, or losen contacts, and if there is not anything else wrong the sound board inside the TV must be tested and replaced.

    This job should be done by a qualified technician.

    If you decide to call a repairman you can use the telephone number printed on the user manual.




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  • 2 Isolate the problem. The main troubles that will crop up with a TV set are either no picture, no sound or both.
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    8. Check the TV speakers to see whether they have been muted by accident. Press the volume button on your remote control or go to the Menu section and scroll down until you reach TV Speakers. Toggle left or right to turn the speakers on or off.
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