Question about Toshiba 27AF43 27" TV

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White lines at top of TV

I have white lines at the top of my TV which come down approx. 2 inches. I've read around the site and found that it could be a problem with the Vertical Output. I took the TV apart, and noticed that this Capacitor (C521 on the board) had some white stuff that appears to have come out of it. Does it mean it's blown and that it is my problem?

I took some pics:

http://img.photobucket.com/albums/v287/2001championsr6/Image007.jpg

http://img.photobucket.com/albums/v287/2001championsr6/Image004.jpg

Any info on this would be great...

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I had the same problem with horizontal white lines about 4 inches at the top of my 5 year old 27AF43 Toshiba. Solution, I found by google was to replace C407 but no directions. Here is how I did it.

First is to locate a new polarized 100uf 35V capacitor. I was able to buy 5 of these at a local electronic parts store for $2.50.

Next is to open up the TV. Turn off the TV and unplug all wires, place TV screen side down, remove the seven large screws, three on each side and seventh a couple of inches up from the bottom and about nine inches in from side. Then remove the two small screws in the area where the cables plug in. Gently lift off the back cover.

Put a large magazine or newspaper over the bottom part of the picture tube to protect if from scratches.

Next is to pull out the cicuit board at the bottom of the TV, it's the only one. Clip the cable ties holding some of the wires to give more freedom of movement and then gently pull up on the board. It doesn't need any fidling with clips or tabs or such, just pull straight up. You don't need to disconnect any wires.

Then locate capacitor C407. It is black and marked on the cicuit board and is 3 1/2 inches in from the edge and right by the corner of a heat sink. It will have 100uf 35V written on it. Note which side is the negative (this is important). It will be the same side as the other capacitors close to C407.

Next is to replace C407. Take some measurements from the edges of the cicuit board so you can locate C407 (from the bottom) and then flip the board over and locate C407's leads. Draw a circle around its leads with a felt pen. Us a fine tipped soldering iron and a solder ****** to remove the solder. Be careful with this. Might take a couple of goes but eventually you will beable to wiggle C407 and it will come out.

Put the new capacitor in and make sure the negative is on the correct side (this is important). Solder the two leads and be very careful the solder doesn't bridge between the two leads. Let it cool for a few minutes then use a pair of side cutters to cut off the excess leads.

Slide the circuit board back and push gently down until it snaps into position.

Remove the protective magazine or newspaper.

Use a couple of new cable ties to replace the ones you cut.

Replace the back cover being careful that the power cord is positoned correctly into its little notch. Replace the two small screws and the seven large ones.

Reattach the cables. Cross your fingers and turn on the TV. With luck your white lines will be gone.

Good luck

Brian
VE6IMB

Posted on May 05, 2009

  • 1 more comment 
  • brgibson Aug 27, 2010

    Hi, I noticed that the sticker on the tv warns about shocks. My friend has a Toshiba 27AF43 with this problem and would like to replace the capacitor that you suggested. However, he would like to know if there are any other capacitors that may have voltage stored up or any part of the circuit board you should not touch, to avoid an electrical shock. Thanks for any suggestions.

  • ve6imb Sep 12, 2010

    Be careful of electricity. I am not an expert. I let my TV sit unplugged for about four hours before fooling with it and did not get shocked.

    Good luck

    Brian
    VE6IMB

  • Brett
    Brett Feb 11, 2011

    As a motorcycle tech, not an electronics wiz, I found your descriptions and instructions crystal clear. Along with a little advice from Youtube and the electronics store, I was able to put it together cleanly and cheaply.
    Now we can use this TV for at least another year while saving for a more current LCD TV that will carry us into the next generation of digital media.
    Thanks Brian!

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Same problem on a Toshiba 27DF46 fixed by replacing capacitor C407 (100uF 35V.) The faulty capacitor looked absolutely normal, no bulges or leakage.

Posted on Oct 14, 2009

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I love you guys. i replaced c407 & 408. since the lines were stationary, i replaced the V.O. ic as well..was getting ready to change c407 but googled it first and found your same solution. i felt confident as i changed the cap and sure enough, it fixed it! thanks to all!

Posted on Dec 04, 2009

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