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Question about Sanyo DS31590 31" TV

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Picture will suddenly get horizontal lines then may only get a bright horizontal line in the middle of the screen. I can rap the top of the set and the problem may go away, but it returns again at a later time. The TV is 9.5 yrs old. Sanyo Model DS31590, Chassis 31590-05

Posted by farlop65 on

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1 Answer

Francisco Mauricio G

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  • Sanyo Master
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Maybe you´ve cracked solder joints on the vertical Ic and need to resolder it

Posted on Jul 27, 2010

  • daniel timmons Aug 17, 2011

    wondering if this fixed the problem mine is doing same thing

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Screen suddenly has only a thin bright middle

If it has a white line in the middle running left to right the problem is in the vertical circuit.

This can come with age as solder connections (this is the most common cause) come loose or break at the chip in that circuit.

Much of the time with set on a good hard rap on the top or side and the line will try to open and return a full picture.

Someone who can get to it and can solder can fix that---the chip will usually have 7-13 pins and be mounted on a metal plate that is fairly small(it keeps the part cool)---fixed a lot in less than ten minutes.

You will have to open the set, locate the chip(usually a location number on top of board by it will be something like IC301 or 401).

Most of the chips will have a generic number on them a LA------ or such. You will have to remove the board to look at the bottom where the chip solders in.


I attach a photo of a typical chip.
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If you have a white line on screen---middle that runs left to right it is a vertical circuit problem.

This can be a easy repair: The set uses a chip---usually 7-13 pins in a straight line package-----a lot of these sets the solder from heat breaks loose and all that is needed is to resolder the pins on that chip.

A hint: usually a good solid rap on the top or side will in this case try to make the picture open up.

You need to be able to get to the part and solder.

use the make a comment button if you have questions or need more help.
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