Question about LG 42PX4DR 42 in. Plasma TV

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LG 50 inch flat screen tv the picture flicker and black out

Picture flickers and blacks out

Posted by franklin simpson on


5 Related Answers


  • 92 Answers

SOURCE: 37 inch flat screen LG TV flickers


Take the TV to a local TV Repair shop.

Ask them to check the Inverter and the Power Supply.

Deffinately fixable.

Posted on Sep 06, 2009


Chi Chu

  • 8457 Answers

SOURCE: No Picture on a 4 yr old TV

Ur LCD inverter board it dead,need it replaced.

Posted on Nov 20, 2009



  • 302 Answers

SOURCE: LG 50' Flat Screen TV;

A black line down the middle of the TV can be a few things. You plasma panel might be bad your buffer on that location of the screen might be bad or your logic board might be bad. Teh only way to find out is by replacing the parts , You can get parts at

Posted on Jun 08, 2011


Donald DCruz

  • 17130 Answers

SOURCE: 42" LG Plasma HD Ready

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:

Thank you for using Fixya.

Posted on Aug 20, 2011


Steve Allison

  • 5569 Answers

SOURCE: 42" lg lcd tv pitcher flickers then gos black

Since the audio is still working, the main power supply probably
wasn't at fault and you may be looking at more research and possibly
more expense.

The problem is very likely on the largest board or with a failing
circuit that is part of the display.

You may be able to isolate it by using 'freeze spray' which you can
buy anywhere electronic parts are sold.
I suggest more than one can of it; ~ $7-8/can.
You will need to have the guts exposed and the set turned on.

Look around the edge of the display itself for chips (ICs) and give
any you see one brief shot of the spray, wait for ~1 minute for it to
'soak' and then move on to the next one.
If the video comes back, even if only briefly, repeat the cool-down
until you are confident to have found the right one.

If you can isolate it, you still have a problem.
If the sick IC appears to be 'glued' (with solder) onto instead of
through the board, you may not be able to replace it successfully.
If you can see that it has pins going through the board, these can be
replaced by anyone with a professional soldering tool and a steady

Remember, the problem can be on a board that is only connected to the
display panel but if on the panel itself, you may not be able to buy a
replacement for less money than a new set would cost.

Posted on Nov 10, 2011

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