Humming noise coming from television - Sansui 19 in. LCD TV

There are multiple fans and a high speed light device and a ballast in that television. All could be causing this.

Check power supply filter capacitor that goes to Audio IC.

usually it means your screen is going bad unless it is a fan or some mechanical part thats humming if it comes from the screen itself the screen panel going bad.now you can check cables and eveything else for this a signal loss type of short but if you have allready checked all cables or recievers or connected devices for this then its a simple main panel humm means a bad screen panel sorry to say but i hope this helps..

Maybe it's a fan?

It is very possible that it is the fan you are hearing. They run constantly running, and their bearings tend to overheat casing a hum noise.

lost the lamp, replace lamp

sounds like the color wheel. Do you have a DLP TV?

replaced the light engine. yhis set is probably not cost affective to fix.

Usually a humming noise is a transformer going bad.

. These are the caps I replaced they where only a little swollen I was worried if they where even the problem but I changed these three and was very happy that my TV is now working like new again the two top ones I replaced with 1000uf 16v the lower one is 1000uf 35v ok well I hope this helps ya