I'm sorry to hear that you're having this issue.
Often, picture drop-out issues are a result of HDCP, and if you're connected to a cable/sat box, try unplugging it to reset the unit. In many cases, this fixes the issue. If that doesn't work, the box may need to be refreshed or upgraded (this can often times be done over the phone with your service provider).
Before paying anyone, try troubleshooting that first to see if that fixes the issue.
We have a Samsung tv, about 3 years old . After the set has been on for around 2 hours, the picture goes off, sound stays on. We turn the set off and then on again, the picture will go off again, may be straight away or it may stay on for an hour or more. Wondering what the problem might be and cost to fix. Appreciate any help and imput. Thanks