Question about Dell W4201C 42 in. Plasma HDTV

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Dell W4201C 42" Plasma Horizontal lines through top of screen

The lines go all the way across the top 4" of the screen. They are multi-colored, fuzzy, and appear only when something is on the screen. They are faint when the entire screen is black. Other posts here suggest that the logic board might be bad. Other indications are the main board is bad. How can I know for sure which board is the one to replace.
By the way, Dell's out of warranty service is a joke. They said it would be over $1100 just to ship the TV to their 3rd party repair center. I'll buy a standard brand name next.

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  • Catinthewash Jun 01, 2009

    I did a quick visual check and didn't see any discoloration or heat damage. I'll look more closely. Although I can use a voltmeter, I wouldn't know where to check or what voltages to check for. Here's a pic of the problem...

  • Catinthewash Jun 02, 2009

    DELL 4201C 42" Plasma TV - Horizontal Lines on Screen:

    The lines go all the way across the top 4" of the screen. They are multi-colored, fuzzy, and appear only when something is on the screen. They are faint when the entire screen is black. Other posts here suggest that the logic board might be bad. Other indications are the main board is bad. Still others suggest voltage levels might need adjusting or power boards might be bad. If anyone out there has worked on this model, please let me know. Dell's out of warranty repair service is a joke. No local TV repair place can work on this brand. I've got to fix it myself or trash it. I'd rather fix it. Thanks!

  • Catinthewash Jun 02, 2009

    Yep, I checked them. In fact I disconnected everything and took the back off the TV to do a quick visual check. After re-assembling and re-connecting, the problem remained. It's the same on either HDMI input and also the s-video input.

  • Catinthewash Jun 03, 2009

    bepositive:

    There is a logic main board and a logic buffer board. Do you know which one it is?

    Thanks!

  • Catinthewash Jun 03, 2009

    localwonder:

    Thanks, now we're getting somewhere. I just found out there are two logic buffer boards - one for left and one for right. I can see nothing with my eyes that tells me which board it might be. What would be the best way to trouble shoot this?



    There's also a buffer scan top and bottom board. Any chance these might be bad too?





  • Catinthewash Jun 04, 2009

    Never mind I got it. Now it makes sense. Certain horizontal lines are controlled by one of the boards, other horizontal lines are controlled by the others. These boards are on the side of the screen, Y axis. The vertical lines are controlled by boards at the bottom of the screen, X axis. I unplugged a big ribbon connector corresponding to the problem lines on the screen, and it went away. So did the image but it's a sure thing this is the right board.



  • Catinthewash Jun 04, 2009

    I ordered a new upper Y-buffer board from an ebay source. I'll let you know how it goes!

    Thanks

  • Catinthewash Jun 04, 2009

    nicolocarlo:

    After several people gave me advise, I think the upper Y-buffer board is the problem. I ordered one today. If this works, I'll let you know. Thanks.

  • Catinthewash Jun 05, 2009

    Castelll:

    Thank you. I was able to remove the board with no trouble. I should have the new one in 3 days. I'll let you know how it goes.

  • Catinthewash Jun 09, 2009


    Success! Thanks to everyone who helped me out with this one. I learned a lot about how these TV's work and believe I can keep it running indefinitely. My advice to anyone in the same situation is to buy parts now while they are available. I bought my upper Y-buffer board from www.techbargains4you.com I plan to buy the parts most likely to fail as soon as I can.

    Thanks again everyone! This DIY repair saved me a ton of money and grief!

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The new Dell 4201C 42" Plasma HDTV delivers spectacular High Definition picture quality with bright, vivid images and superb contrast. The W4201C is multi-media optimized with a wide aspect display providing 1024 vertical lines and 768 horizontal lines of resolution.and in which the optimized multimedia is controlled by logic board.in your tv logic board is bad.because if the main board is bad.this horizontal and vertical line would not been shown.only a thick black line shows up on the screen and nothing else if the main board is faulty. its the faulty of logic board. you can order required pars at  www.partstore.com or at  www.shopjimmy.com thanks.please do rate the solution.thank you for using fixya.keep updated.

Posted on Jun 03, 2009

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  • Dell Master
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Replace the pixel generating circuit board and retest.

Posted on Jun 05, 2009

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  • 187 Answers

Ok, let me explain it a bit, your TV have 5 "mayor" boards POWERBOARD, MAINBOARD, TIMER CONTROL BOARD, Y SUSTAIN BOARD AND Z SUSTAIN BOARD.

Your problem is the Y Sustain Board, it is located on the far left of the TV (from the back).

To replace it you must unplug all cables first (of the Y sustain board), then take all the screws, replace it put back all the screws and plug all the cables again.

Be careful with the cables, those are the most sensitives of the TV and have a lock that you need to pull before actually pulling the cables.

Contact me as soon as you have the board and I will send you step by step instructions.

Bye

Posted on Jun 05, 2009

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  • Master
  • 2,187 Answers

I have heard of this issue before.. let me take a look at it...

Posted on Jun 04, 2009

  • Nicolo Carlo Parazo Jun 04, 2009

    I would think that your logic board is bad... if it were caused by bad "pixels" or small segments on the actual LCD screen, you should not have the entire row go bad. IT would be unlikely that the entire row is bad but I am not saying that it is not possible.



    I have to warn you that there were individuals who tried replacing the logic board but did not solve the issue.



    Others also had the same porblem with different locations of the lines.



    I have not tried opening up a Dell Monitor but there are some that has a single board to support the whole screen. Which means a damaged component means to replacing the entire board. Apparently the insides of this montor cannot be repaired unlike old monitors where soldering and replacing of ICs may work.

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The correct part number of the relevant lgic board is LJ92-01270E. Just check with http://www.ptscorp.com/ to order it online. Verify with your hardware that it is the correct number! Some models differ slightly.

Posted on Jun 04, 2009

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HI, thanks for the picture. it makes it very easy to diagnose.This is the result of a failed buffer board. replacing this failed board will eliminate this issue. the main is fine.

Posted on Jun 03, 2009

  • Michael Masters
    Michael Masters Jun 04, 2009

    I apologize for the late reply. The Y buffer on right is the bad board here, i should have stated that in my previous post.

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  • 136 Answers

Okay i think you should check out your RCA cables or your component cables... a bad connection to those can cause the static or the fuzzy lines. you also need to make sure there isnt any other kind of connection issue with your cable... after all it might not be your tv.

Posted on Jun 02, 2009

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  • Master
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Hi there,

check the mainboard for any burn or leak on the resistor area. use a VOM meter to test the board. if you have no idea or experience servicing the unit better to call for help, working inside is not so easy and very dangerous because of the high voltage store on the unit.

Posted on Jun 01, 2009

  • micromaster
    micromaster Jun 01, 2009

    first check the video output module look for any faulty or leaking resistor on that area.

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