My 30 yr. old Curtis Mathis console tv screen went black tonight after a white line went across the center of the black screen. Won't come back on. Is the main tube blown?
The TV is a floor model with a chromed swivel base. It is made of cherry wood. For years, on rare occasion, the screen would "blip" to black with a single, narrow white horizontal band across it. Tonight, the screen went out just after a white horizontal, and a white vertical band appeared on the black background. The vertical band had some white sqiggly lines attached to it also. Then, the entire screen went totally black and will not come back on.
Televison & Video - Curtis-Mathis - CM32010 TV
Answers & Comments
Any time you have just a white or a colored horizontal line across the "Middle" of your screen it means you have a loss of vertical deflection. This can be the result of:bad connections, a bad vertical output driver I.C., & usually its going to be bad capacitors. Other less common problems are a loss of voltage to driver circuit and on rare occasion a bad yoke.
When the picture collapses to a vertical line down the center of your screen, it means a loss of horizontal drive from the horizontal output stages which include the horiz. oscillator, horiz. output transistor, the flyback transformer & its associated capacitors, diodes, and voltage dropping resistors in the lower voltage and higher voltage screen circuits. A less common problem for this would be an open in the yoke circuit.
In this old of a set, bad solder joints in any of the above mentioned circuits should be a first consideration especially around the flyback secondary windings and the voltage input points in the oscillator stages. I have found everyone of these problems over the many years I serviced these older sets.
Unplug it,then wait 10 minutes,then plug it back in.