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Px-42m3a has dark screen. not sure where to even start on this thing. Are there any schematics or troubleshooting guide out there?

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Thanks for using FixYa. To start with you’ll have to open the back of the unit, then check the power supply board and check for bad components. As the power supply board develops high voltage to supply to all components so you should check that board for any bulged capacitors and if you have electrical expertise you can also check that board/components in a better way. These issues usually happens due to overheating in plasma TVs after sometime, as these sets are very hard working device and produces a lot of heat. Please do accept the solution if the issue is resolved or post a comment for further assistance.


Posted on May 27, 2010

  • Jonathan Caldwell May 27, 2010

    I am checking these components now. I am in digital electronics school now and learning as I go. If its alright I would like to continue working with you on this tv until I resolve the problem.



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Ok you are going to need these items before we begin. digital multimeter, and the schematic of your set. These items are the bare necessities for troubleshooting this problem. If you are uncomfortable around electricity, don't even attempt troubleshooting the set. Ok the thing you need to do first is: 1) get the schematic of the TV set (Call the manufacture to get this) 2) get a digital multimeter (your local radio shack will have this) 3) take picture of the circuit board so as I can have a visual guide by which to help you locate components. 4) send me a copy of the scematic so as I can guide you through the troubleshooting procedure. Ok get these items and we can begin.

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I have purchased a samsung monitor bearing model no. 740N 17" on 06.03.06. Now the screen became dark just after booting the computer and visualizing window XP process. Even it do not give any other...

First, try it with another PC to make sure it is not PC Video card problem, if the screen is still dark, then you will have to open it up and do some troubleshooting.
Please read my guide and I am sure some of your students have electronics knowledges.

Please see my basic troubleshooting guide here:
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Learn about bad caps:
Capacitors kit: he can make you a set of caps.
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Right after a software restart, my al1916w ds acer monitor won't turn on. I can hear Windows start, but the screen remains dark. I see nothing at all on the screen, not even the Acer logo or "no...

Try it with another PC just to be sure it is not PC problem, if it still does not work, you will have to do in-depth troubleshooting.
If you are going to DIY and have proper tools and know safety precaution then please read on:
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Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor troubleshooting guide:
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If the screen is still glowing, then you may have either dead T-CON board or the main board. Dead backlight inverter board will not get any glow on the front or the back of the LCD panel.
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If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

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Hello atahirkhelii,

This is an indication that your back-light or inverter has malfunctioned. This problem is tricky, because if the back-light is a separate unit you will be able to repair this problem by replacing the back-light or one of its associative components, however if the back-light is part of the screen so as to make it one unit, then the repair job becomes cost prohibitive.

The troubleshooting process is as follows:

1) take the cover off of the screen panel and expose the back of the screen and the circuitry of the main board.

2) with a multimeter measure the test point voltages as compared to the schematic and note any abnormalities.

3) using the schematic as a guide determine if the back-light can be turned on manually (this is just a test to see if the back-light or its circuitry is the problem)

4) if the back-light circuitry is faulty replace the malfunctioning components,if the back-light is faulty replace the back-light (if possible, because the back-light may be part of the screen)

5) If you can replace the back-light order it from the manufacture to insure compatibility.

6) if you can not replace the back-light because it is part of the screen, contact the manufacture and ask them the cost of a new screen/back-light combination.

7) replace the components, close the unit back up and then do a 48hour burn it test on the player.

I hope this helps,

Thank you,


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