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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 get the squeal.

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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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