Question about LG 42PX5D 42 in. Plasma HDTV

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Lg plasma i purchased a lg 42" plasma from best buy about 4 days ago and the screen flickers, the tv is connected to a motorolla hd cable box from comcast via hdmi cable what would cause the flicker, all connections are tight.

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  • Anonymous Mar 16, 2014

    Screen flickers with sound and gets darker. menu also flickers

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There are 2 types of flicker, one is the lamps that drive the display and the second is the sync signal of the video.
I assume the video sync is the flicker you see,
I would try connecting a different way to make sure it is not the tv,
connect using the aux /rca connectors to cable box.
and or connect using the cable direct bypassing the cable box.
I have seen several complaints about the hdmi cable signal being incorrect in some way,
this is the same issue that the svideo connector had in its early adoption signal was too hot or too low.
another thing to watch out for is the low light sensor on the front of tv if it gets an incorrect reading it can flicker the back light though it should be slow in doing so.
some times the flicker you see is not flicker but ac running through the sides of the picture from an ungrounded cable source.
how does it perform if you play a dvd player , with and without the cable box connected.

Posted on Apr 29, 2008

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snakehead
  • 1070 Answers

SOURCE: plasma

if your tv is on warranty take it back to best buy for a replacement.good luck

Posted on Jul 25, 2008

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My lg plasma really flickers but it does this randomly. Sometimes it will happen all the time other days not at all. I have tried sorting the cables and unplugged etc. it is 10 years old but just wanted...


I suspect its a component (Capacitor) aging and eventually would need to be replaced. How do you have it connected? Is there a cable box or Direct TV receiver that you use to display TV Channels? If 10 years old does it even have an HDMI input? Should be very happy you got 10 years of life out of this Plasma. My thoughts is that it would take more to repair this than to purchase a new LCD or LCD/LED thinner TV. Plasma does have the best color but the LCD and LED TV's are much lighter/take less energy and are much brighter. Good luck.

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This is a common fault solution which can be checked and corrected by you assuming that there is no component failure.This can be due to faulty capacitors that have gone weak and resumes the value after some time when the cotlage builds up. Also there is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Check for tips to look into the SMPS unit with some of my tips:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

Thank you for using Fixya.


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I believe that you are experiencing an intermittent problem with what's called your florescent lamp ballast. The best thing is that it can be repaired/fix. There should be a LG repair shop in your area. Cheaper to bring it in than have a service tech come to your residence.
Should be between $200 to $300 for a repair.
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With seeing the picture it will be hard fro me to tell what..I am going to guess according to the information you've provided.
It could a buffer or a signal board(s). This TV is only 4 Months old I would call LG and file a warranty claim. LG (800) 243-0000

Best of luck
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if your tv is on warranty take it back to best buy for a replacement.good luck

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if normal tv is fine then ,likely the signal from the box is too hot.
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there is no cable slot. the monitor is not a receiver. it has no tuner in it. it will need a signal from a tuner box. and that must be fed to the tv with an hdmi cable or a dvid cable for hd to work. see your manual for further information on cables. see your cable supplier for information on hd boxes available in your area. if you do not buy hd service, you will not get an hd signal. so you will see little difference from a non hd device. your dvd player may have hd capabilities, but will also need the same cable to deliver true hd signal.
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