50 sanyo hdtv model dp50747 with a black bar or colored lines about 1 wide down left side of screen. I have checked all the ribbon cables and made sure all were tight and good conection. What next?

Contact any service technician. Did you thought it is an easy job like swallow a banana? Spend some for others too; man. https://electronicshelponline.blogspot.com/

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

If you have JUST two green lines then your choices are between the buffer boards, YSUS board (all boards on the LEFT side of the TV when looking from the back) and , less likely, the main or plasma controller board. I'd really focus on the first two.

if you have two lines ON TOP of otherwise normal picture then you most likely have a bad panel, specifically the address register ICs embedded in the display's fabric underneath the display ... there's no solution to that I'm afraid.

www.coppelltvrepair.com

if it runs across the screen its a buffer board usually. Can you paste a picture of the line?

My best advise is to Return it NOW ! Plasma sets only a expectancy of non repair for only 2-3 yrs. I would exchange it for an LCD version.

There is no invertor board on a plasma tv. The fault is the X address buffer board. This is located on the bottom of the screen and runs horizontally the whole width of the screen. If you remove the heatsink plate that covers the x address boards and you need to look at the screen ribbon at the same position as where the bar is (in the middle).Vary gently lift the Xbuffer ribbon lock and gently take out the ribbon.Clean the contacts very carefully with a fibre pen or an electrical cleaning fluid.Insert ribbon back and heatsink and check.Here is a picture of the board and ribbon


a 1 inch bar is associates with 1 ribbon fault. So if the bar was 3 inches in from the left of the screen, the faulty ribbon will be 3 inches in from the right working from behind the TV. If cleaning dont cure the fault, then the Buffer IC will be blown and order a new centre buffer board (you can buy off Ebay)

hi...
It sounds like an Intergrated Circuit (IC) has fried.
Your best bet in this situation is to contact ur tv service operator and let them recommend an authorized service center in your area....

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The screen does not work properly .Ribbon wire fails.

This is a Sanyo Vizon 50" plasma the model number is DP50747 .. hope this helps the website for this product is www.sanyoctv.com and the phone number is 1-800-877-5032

PiP or bad connection. disconnect the set with all cables and reconnect and see what happens