I have to scan my seiki tv every time I turn it on are turn the channels why

Your Seiki TV keeps repeating the startup process because local channels have nor been stored after having been identified. A review of the startup procedure should lead to a solution.

I assume you try to watch cable TV without box? Unfortunately some time ago government passed the law that cable companies are not longer required to provide basic programing in Clear QAM. Which basically means no free basic channels from cable company. Only way now is to get free channels is to use over the air OTA antenna. On most cable providers in USA you are not going to receive any channels without box. This is reason for "snowy" picture.

Main system control memory IC fault. Replace it. This is a very small IC, can be located very near to the main system control IC.
Will look somewhat like this.
DIL type SMD type http://electronicshelponline.blogspot.com/

Every time I try and connect my seiki tv to the internet it scans then my tv turns its self off, It worked for a few months then all of a sudden it won't let me connect it and it turns off! Someone help!

Your TV must receive a digital signal in order for the DTV option to be available. Since you are not seeing all of the channels when you auto scan then it can be assumed that the signal cable connected to your set is not providing the digital signal. Make sure you are scanning for the proper source of your signal ( Cable TV, Broadcast TV)

Using the TV remote unless you can do it manually switch TV to channel 3, not the cable box the TV, you don't need to scan for channels you do need a cable box though

Seiki SC323FI LCD TV download instruction manual pdf

try plugging your tv directly to the wall outlet and bypassing your power strip. let me know if this helps !

Go to your settings and Lock your TV ... What this does is Locks in your TV settings and channels .... This should Work for you

I bought the same TV wich is in fact a Seiki TV, see the warranty paper. The television has digital and analog tuners so is able to receive digital channels.Our television receive signal thru a rabbit ear antenna and we had some trouble to scan all the digital channels. We had to change the orientation of the antenna to receive correctly the signals and we had to scan many times. We finally conected the TV to a roof antenna so we where able to scan all the channels of Montreal, north Vermont and north New York areas since we are living in the south shore in front of Montreal. After the scan was completed we conected back the TV to the rabbit ear antenna and the television is working correctly receiving all the stations of Montreal area with a very good picture quality.
Claude