Question about Toshiba MW27FN1 27 in. TV/VCR/DVD Combo

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Unwanted horizontal lines

We get these continuous (white) horizontal lines at the very top, about 10% of the CRT screen height. It detracts quite a bit from the quality of the picture. This is now for about 2 years.
Is there any adjustment for this I can access, or what is a possible cause/solution.
The product is MW27FN1C and was purchased July 2003.

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  • blgardn Jul 27, 2008

    I have a 27" model MW27FN1 with the same horizontal lines at the top 4" or so. I know the only adjustment is vertical position. Can I replace the circuit board with the vertical circuits?

  • Anonymous Dec 01, 2008

    Unwanted horizontal lines problem

  • janaindc Dec 01, 2008

    Same horizontal lines on my TV. I've read the solutions, but I'm not technical and wish someone translated "caps, CADs" into plain English. Another problem is the DVD player: DVDs get stuck every now and then, DVD player won't open even though the motors keep running. Obviously, not a good TV model :(...

  • Anonymous Mar 06, 2009

    I have well had the same problem with the lines and replaced C427 that fixed thank you guys so much!!!!

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I had the same problem on a 2003 Toshiba 32A13 TV. I replaced C407, 100 uF 35V and it fixed the lines. I noticed that this capacitor was mounted near the heatsink for the vertical output IC. I don't know if the heat aged the capacitor faster or not. The only cost was $9.99 for a 32A13 service manual download. I had a new capacitor in my misc parts box and it has a 105 degrees C rating.

Posted on Jun 17, 2012

  • travishill02 Mar 29, 2015

    This fixed my Toshiba 32A13 TV. Bought a capacitor for like 1$ and replaced C407, found a site to download the manual free!

  • travishill02 Mar 29, 2015

    Thanks for posting this fix

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Well that depends on 1) what have tried to fix it, have you tried a reset on the monitor or any other tools that are available on it. 2) have tried updating the drivers for the monitor or your graphics card. in lew of that there could be a component thats going to fail. Personally CRT's are out dated I would get a flat pannel if its affordable for you price wise you can get a good one very reasonably priced

Posted on Mar 29, 2015

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It is C427 electrolytic cap 100uf @ 50V. I had same problem - just replaced it on 2003 Toshiba TV and all is back to normal. Cost $1.5CAD for the part, $16CAD for soldering iron, $2.5CAD for solder and $8CAD for solder ******. New cap is a bit larger then original - no issue.
Good luck!

Posted on Nov 02, 2008

Vert. circuit shows IC 401 LA78041, pumpup Lytic C427 is 100 uf@ 35v., c421 4.7@50v, c429 100uf@35v, c430 2200uf@25v, c438 100 uf@ 6.3v, c434 1000 uf@ 35v, r429 1.5ohm @ 1/2w, r434 1.5ohm @ 1/2w. Try caps first in order above start with C427 ...

Posted on Oct 27, 2008

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A single horizontal line means that you have lost vertical deflection. High voltage is most likely fine since there is something on the screen.

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Dirty service switch contacts. There is often a small switch located inside on the main board or perhaps accessible from the back. This is used during setup to set the color background levels. (On some sets, this is located on the CRT neck board and may be a jumper plug or other means of selecting service mode - not an actual switch.)

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Hello e26pitts,

If the line is horizontal then it could be a problem in your vertical deflection section, if the line is vertical then the problem is in your horizontal deflection section. Now for a little more detail.

If Horizontal line is present the vertical section of the yoke transformer is nit responding to current flowing through it due to being open, or the vertical coupling capacitor is open, or even the vertical drive transistor might be defective.

If Vertical line is present the horizontal section of the yoke transformer might be bad. Now this gets kind is easy in a way, because the yoke would be the sole cause of your problem here (maybe there is some circuitry doing some horizontal coupling check that to) because the horizontal section controls other functions that would also respond if this were a horizontal drive issue. In any event these problems should be checked by a qualified TV technician, I would suggest that you take the TV to a repair shop to have it worked on.

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