Sanyo DP50749 3 vertical lines

Read the Service Manual and see if it covers it.

https://www.manualslib.com/manual/911464/Sanyo-Vizon-Dp37647.html

Video help here

https://www.google.com/search?q=sanyo+vizon+vertical+lines+on+tv

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The Vertical output Stage of the TV is Faulty. Can be drysoldering joint in the leg of vertical output IC Or the vertical output ic is faulty.
If you wish to get some details; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/

Check the ribbons going in between the boards and "work" them to clean up all connections. And on the main board look for possible bad caps.

Your t con board is responsible for all picture distortions but not the vertical lines you described.

There are two possibilities.
1. Deflection yoke mismatch.
2. Shorted component/s at its horizontal oscillator section circuit or at its main power supply regulator [SMPS].
Contact any service technician
http://electronicshelponline.blogspot.com/

vertical ic fult or vertical section supplys missing

If the line is "vertical" then the vertical circuit sounds OK. The problem would be in the horizontal deflection.

Check yoke connection and solder around horz defl circuit.

If the line is horizontal then I would suspect the vertical IC.

did you try their web site
sanyo.com

no you have no vertical bad chip ic

what have you picked. to the tv

Hi there!
This is called a frame collapse. The Amp that drives the vertical sync has failed. This could be from excesive voltage on the mains, Lightning in the area, if you had or simply general failure. May also be dry joints( or loose connections) in the vertical amp or scancoil terminals. Good Luck,JUS004