Sansui DTV2798 Model-Has horizontal lines at top of screen

You should use a signal booster.
http://electronicshelponline.blogspot.com/

Diagonal retrace lines at the top are usually the result of bad electrolytic capacitors in the vertical deflection circuit most vert. deflection circuits derive operating B+ from a horizontal flyback transformer winding rectified & filtered usually around 24 volts the electrolytic capacitor on this supply loses capacity or may totally go open causing the retrace lines,sometimes other electro. caps in the vert circuit can cause this too, depending on the age of the tv you may find multiple substandard electrolytic caps it's best to test all for capacity & esr. Without knowing more details about your tv brand,model and/or chassis i can't help further.

The vertical and horizontal adjustments are out of sync.

Check whether the input selection is set to A/V.

The problem is vertical failure. Vertical output section to your TV ahs the fault. You ahve to check the vertcial output circuit for any component failure or loose solderings.

sansui k2k 21 tv service code

Welcome to FixYa!

The code for a SANSUI TV is 0463 or 463.

Thank you for using Fixya, have a great day.

Jas247

Sorry this is the best I could do for you. I tried to get a free copy for you but could not find one. Just copy and paste this link into your browser to see info about getting your manual.

http://www.manualuniverse.com/manager/products/manualExp.asp#mrcI

Hope this helps, let me know if I can help you with anything else.
JimmyC

I HAVE A SANSUI TV MODEL DTV2798 AND THE VCHIP IS ACTIVATED. I DO NOT HAVE THE CODE. DOES ANYONE KNOW HOW TO FIX THIS ISSUE?

Yes. It takes a while to scan for all the channels.