Question about Toshiba MW27F51 27 in. TV/VCR/DVD Combo

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VERTICAL HOLD NOT WORKING PICTURE TUBE HAS HORIZONTAL LINE

HOW TO FIX OR REPLACE VIDEO BOARD.

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OK below is a service manual to download, this is what engineers use to troubleshoot and repair.

http://elektrotanya.com/toshiba_mw27f51.pdf/download.html

Posted on May 05, 2010

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I have a Panasonic TV CT-34WX50 every time I change channels


it sounds that have problem in the chroma board ( video board ) a small board that hooked up in the neck of the picture tube. if the color is greenish the cause is dead in red video driver transistor or open resistance. hope this can help good luck.

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My TV's video is out. A straight line goes horizontally along the screen. The sound is fine. It use to come and go, now it is gone for good. Does a tube need to be replace?


Hello.Theres a loose connection in your CRT board of your television.The problem is in vertical section maybe the vertical output IC is cold solder.Thats why harizontal lines appear in the screen of your TV.Your picture is good the problem is in the CRT board at the vertical section.

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Picture go into a thin line.


You have a thin horizontal line in the center of the TV. You, in this case have vertical IC that has bad grounds. Resolder the vertical IC pins and check the capacitors in the immediate area and replace these caps as necessary. If you still have a horizontal line, you will have to replace the vertical IC. Find a TV tech or someone with electronic experience to do this for you. Should be reasonable to fix. Thanks for asking and Good Luck!

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Distored picture


Well, if your horizontal is off frequency and you have diagonal lines then there's no need to look at the Horiz Output Transistor or the Vertical section. You will have to use your scope to check the oscillator freq. and go from there.

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1 Answer

Flatline!


the vertical drive ic that drives the yoke for vertical sweep has blown.
sometimes it is solder problems like sharp and toshiba had.
the part is 10$ the pc board will label it ,the yoke is the coil setup on the picture tube.if you follow the wiring half goes to the horizontal drive,and the others to the vertical section.the chip drives the coil directly.there are VERY high voltages in there ,even turned off. the pix tube cap on top is 30000v. like a stun gun.the horizontal drive 2000 volts and the main power supply 165 volts dc high current.you need a special setup to discharge the picture tube.

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1 Answer

Line across picture tube


It's a bad solder connection on the vertical IC.It will be mounted on the main board.It is vertical in length and will have thirteen pins..should be marked "LA7838" or similar.

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1 Answer

Line across picture tube


Had the same problem with mine. The vertical hold chip broke loose from the solder,Resoldered it works fine. You will need a magnifying glass to see this on the bottom of the board.

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Hitachi 51GWX Scrambled Picture


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No picture


gets white horizontal streaks for a split second, then back to no picture. i think sound will be alright. while horizontal streaks are called retace lines & is due to video section failure. please call skilled tech to fix it it is not a major problem & can be rectified. at your place without replacing much parts. your tube is ok. good luck

Sep 27, 2007 | Zenith SY2551S TV

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