My Sharp TV is from the 1990's. I hooked up HDMI to get Sling TV and this worked for months until the picture started rolling. How do I find the vertical hold button?

SOURCE: Quasar 32" TV VERTICAL HOLD

well most of the modern tv today doesnt have vertical hold anymore. this symptom is caused by a trouble in the IC integrated circuit or the vertical oscillator circuit. let the service guy do the job if u dont know anything about this. good luck!

SOURCE: vertical hold problem

Maybe sync separator transistor is faulty

SOURCE: PS3 been working fine over

TV Connectivity
The issue of connectivity between the PS3 and the display is very complex and depends on the type of TV (Analog, Digital or HD Ready), the maker of TV (until recently, only Toshiba TVs have component AV connections as standard in Europe, most other Euro TV sets use SCART which can not carry an HD signal) and specification of TV (the very latest HD Ready TV sets have wider connectivity options than earlier HD "capable" TVs from the same manufacturer which may have lacked HDMI), and finally the configuration of the PS3 model purchased.

SOURCE: HDMI audio problems with my sharp LC42D64U

the problem is that your cable box is putting out too low of a bandwidth to your tv and is cutting out completely. Since its all digital either its there or not. try switching to componant cables. Cable boxes only support up to 720p anyway so you wont sacrafice any quality.

Hope this helps

SOURCE: vertical hold on tv

no control over the remote..but impossible not to have vertical hold control in the TV itself. it should have one maybe at the back.