SOURCE: Sanyo DS31590 31" TV vertical deflection
If the vertical is not defective or shorted there is a possiblity of bad solder connections on the vertical ic. If connections are good and has b+ voltage to the chip replace chip which is IC 501 LA7841 or LA7845 and change c511 (decimal point 1 film capacitor)
SOURCE: Sanyo DS31590 31'' TV DO I NEED CONVERTER BOX?
If you do not have cable or satellite YES you will need converter box anyone and everyone that uses antenna to watch tv needs converter Box.
SOURCE: my sanyo ds31590 31 has a black picture with a thin white line in
check the voltage at vertical ic must get 24volt dc then replace the IC that all
SOURCE: picture will suddenly get horizontal lines then
Maybe you´ve cracked solder joints on the vertical Ic and need to resolder it
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