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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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Hi


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.


Thanks
Rylee

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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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:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.

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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:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed ACER monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
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:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://en.wikipedia.org/wiki/Capacitor_plague
Learn about bad caps: Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

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If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
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http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx

Please post back what you find.

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1 Answer

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I'm Going to redirect you to a guide that will help you troubleshoot this problem.
Try all the possibilities until you narrow down the problem.

Because without being physically there, the "shot-in-the -dark" approach to troubleshooting hardware could potentially lead you into frustration, which is never a goood thing, especially in the tedious world of PCs.

So Try This, ok?
http://ask-leo.com/why_do_i_get_a_black_screen_on_my_computer_after_a_while.html
Just patiently follow the guide.

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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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