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Emerson EWF2704. Loss of vertical. Straight line across screen. Thought there were bad solder joints and re heated them but still get the squeal. IC551 maybe?

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You have this listed under flat panel, but I am almost positive this is a CRT tv. Whenever you get straight line across the screen it is usually bad solder joint in vertical deflection circuit. Now usually this doesn't go bad. I would not just reheat the joints I would actually re-solder them. The VDC is quite easy to locate, if you need help on what one looks like let me know. Resolder the joints and you should be good to go. Here is a link to show you the steps. I have used this how to and repaired several tv's.
http://www.riddledtv.com/repair/journal/Vertical/
Thank you,
Lee

Posted on Jun 01, 2010

  • Lee A.
    Lee A. Jun 02, 2010

    Hi,
    I didn't get a response from you....if you need further assistance let me know. I would still re-solder it. Please take a moment to accept/rate my solution.
    Thanks,
    Lee


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Hi:
Usually when you get this problem there are three possible causes that will cause this.
1. The vertical IC itself
2. The pump up capacitor
3. An open Bias resistor usually no more then 10ohms in value, if this resistor opens it is usually related to the IC. What i mean by bias is the supply voltage to the IC.

Posted on Jun 01, 2010

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Hi.

The problem is likely the deflection yoke.

Try to understand if the noise is coming from the flyback transformer, from deflection yoke and ferrite beads in the horizontal deflection circuits or from one of the boards.
If the problem is one of the boards, then the noise may be produced by a melting capacitor.

If problem is the deflection yoke, then the most common fault is still a cold solder joint. Rather than randomly heating all joints you need to check continuity (read Ohms to verify circuit is closed) to ensure that the solder joints are fine.

Here a service manual

Posted on Jun 01, 2010

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1 Answer

White straight line across the tv


This is a faiure of the vertical section in the TV of the deleflection circuit.
Look for DRY SOLDER JOINTS in the vertical IC- trace the leads of the deflection coil to find the vertical IC, normally an IN -LINE IC mounted with an heat sink.
Solder , check the voltage , if not there is fusible resistor from the LOT that would have failed.
Also check the delfection coils, capacitors in the vertical section.

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1 Answer

TV turns on and a white line is horizontal, and i can hear sound.


Hello
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.

Nov 12, 2010 | Emerson EWF2704 TV

1 Answer

Why does television have a straight line across no picture but sound


Hello
It is due to total loss of vertical scaning. Your TV has both vertical and horizontal scan at predetermined frequencies to show the picture over the entire screen. If vertical scan fails, you will see a bright horzontal line, and if horizontal scan fails you will see a vertical line through the middle of the screen.
In your TVs case, there is no vertical scanning now. Usually this may be due to failure of Vertical Output Ic. In some cases, loose solderings on the sodered ponts of vertical Ic legs are noted.
Anyway, you have to open your TV. You must have a concept of soldering, and ability to locate and isolate faulty component. Usually vertical output Ics are screwed into a heatsink metal inorder to radiate heate from it while working. Locate the Ic, and look for any loose solderings first. You can determine it by giving a small hit with any noncuductive material like wood or so, never use a pencil for this as the core pf the pencil ic composed of Graphite, and it is electrically conductive. When you do so, if picture scans vertically for atleast a moment, you can make sure that the solderings are loose. Just resolder all the legs of that Ic, by applying a little more solder; will solve the problem
Just try these, and if you need any more help, ask me through Fixya. Ok.

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1 Answer

Emerson EWF2704. Plug it in and a high pitch squeal is coming from the board. Originally tv had no vertical now it won't come on at all. Thought there were bad solder joints and re heated them but still...


Hi.

The problem is likely the deflection yoke.

Try to understand if the noise is coming from the flyback transformer, from deflection yoke and ferrite beads in the horizontal deflection circuits or from one of the boards.
If the problem is one of the boards, then the noise may be produced by a melting capacitor.

If problem is the deflection yoke, then the most common fault is still a cold solder joint. Rather than randomly heating all joints you need to check continuity (read Ohms to verify circuit is closed) to ensure that the solder joints are fine.

Here a service manual

Jun 01, 2010 | Televison & Video

1 Answer

White line across center of screen


cold solder in vertical ic or bad.

Apr 03, 2010 | JVC AV-27820 27" TV

1 Answer

Just a straight line instead of a picture


A straight horizontal line across the screen means you have no vertical deflection. Could be as minor as a bad solder joint, a failed capacitor, or the vertical deflection IC is bad. Or shorted diode, burnt resistor....

Jul 14, 2009 | Televison & Video

1 Answer

Sound is one but very often picture goes to just a line across the screen, mid-screen


sounds like cold solder joint in the vertical circuit. May be schematic inside case, or look on main board for silkscreen labels, ones starting with V are for vertical circuit. look at solder side with magnifier and you will most likely fine one or more "cold" broken joints, especially where large wattage resistors or IC's with large heat sinks are attached to the main board. Just reheat them and flow new solder on them and send me 5 bucks (only kidding) should be a good fix.

Jun 12, 2009 | Insignia NS- 27" TV27 TV

1 Answer

Problem with tv


The problem is sometimes caused by the vertical output integrated circuit (IC) failing, but usually it's bad solder connections. If you or someone you know is comfortable with electronic soldering, a few minutes spent resoldering the IC pins to the circuit board will often solve the problem. Failure of these connections is common because the IC gets quite hot (and it's mounted on a metal heat sink). The heating and cooling cycles cause the solder joints on the circuit board to crack. You can usually see the trouble with light and a magnifying glass; gray grainy joints instead of shiny connections, and often visible ring cracks around the pins.

Mar 31, 2009 | Konka K1938U 19" TV

3 Answers

When turned on only gets a straight line of color in middle of screen


You lost your vertical sweep. most likely the vertical output IC or a power supply source is the problem.

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1 Answer

Emerson EWF2704 problem


Look for vertical output LA7804 7-PIN IC near right rear of set on heatsink. Look for bad solder joints in that area also.

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