Question about ViewSonic VPW505 50 in. HD-Ready Plasma Television

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VIEWSONIC VPW505 Screen flickering

Just bought this TV used. the screen flashes and flickes and it is mainly visible on light portions of the picture. Its a steady flicker around 2 times per second. Is this TV worn out? Is this a common problem? Is there a simple fix?

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  • Anonymous Dec 28, 2008

    Yep, same thing here. Began as follows: Problem presented only when display was first turned on...that is Cold. As it warmed up, problem went away gradually. Now, problem is constant. Believe it to be the LG control board 50WX1DP_CTRL which essentially decodes the video and then drives all the X-Y boards.

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Got it. I was the 'guest' who posted that I had the same problem. Not the CTRL board as I earlier thought. It boils down to the Y-SUS board (right hand side as you face the back of the display) In the upper-upper left hand quadrant you'll find a small capacitor labelled "C70".

This is the naughty one.

You can verify this by removing the back of the display, powering up and then with a small extended flame lighter, GENTLY warming C70. All it takes is about 2 to 3 seconds and the display will steady up just like always.

C70 is a surface mount capacitor, most likely 33uf at 25 volts. Haven't confirmed this yet. Will post again when I've affected the repair on my VPW505.................

BTW: This is not something you want to attempt unless you have experience with electronics. No.....really!

Posted on Dec 30, 2008

  • sparks513 Dec 30, 2008

    After removing and replacing capacitors, it works out to be (for mine at least) C78, which is right above (physically) C70.

    C78 is still (and this is confirmed, just like for C70) a 33 uf 25 volt capacitor. The polarization will be obvious from the markings on the circuit board.

    Again: If you have some skill working with electronics, please do so. If not, then please don't attempt any of this. It could be fatal to you.


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