Question about Emerson EWF2704 TV
There is total vertical swee failure occured on your TV. All CRT based telivisions have both vertical and horizontal sweep to display picture on the screen. In your TV, vertcal sweep has gone out; and horizontal sweep is there, that is why you see a bright horizontal line on the screen.
There are mainly two reasons for this fault. One is bad soldering at the legs of the vertical output Ic, and the other is Vertical Output Ic failure.
You just open your tv, and locate the vertical output Ic. It can be located by following the wires that goes from the deflection Yoke of the picture tube to main board. This will contain four wires, out of which two of them will be thick, usuall red and blue, and the other two will be thin relative to the above said pair, may be green and black, or green and yellow. You just follow the two thin wires, as they are carrying vertical sweep signal to the deflection yoke.
Normally these four wires are socket pin type arrangements, which has pluged into the printed circuit board, and can be detached by pulling its plug from the board. Just make the board upside down and carefully look for any loose contacted solder joints of any other to the solderings of this plug. If it is found ok, then follow the print to where it goes to. it will lead you to vertical output Ic said above. It will be screwed onto a metal plate, to radiate heat out of it when it works. Just look for any loose solderings there on the legs of the Ic. It is quite normal that these solderings will get loose with time, as these ponts are heated and cooled several times.
Resolder all these legs with applying a little more solder, without any short between these legs. Switch on the TV all connections have given. Normally this will retify your problem. If not, IC stated above is faulty. Resolder it out from the board and go for a same type and number. Replacing it will rectify your complaint. OK.
Posted on Nov 13, 2010
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Posted on Jan 02, 2017
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