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Re: my blackpoint tv does not display anything when...
You can hear the sound of the show, means the TV's main board have no problem. The problem should be with its backlight inverter board. Just check it. Take a torch light, and light it on the screen, and see whether there is any picture on the background. You will see that, if the main board is OK. If so, concentrate on the backlight inverter board. It is common fault with most of the LCD TVs, irrespective of its brand. OK?
If you wish to get some details; check the sites linked here. https://elektrotricks.blogspot.com/ https://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault . Search the site by type in the Brand Name of your set, in its search bar at the right side column, and press enter. See it in Webview with mobile or by desktop. Mobile View has no search box.
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If you can hear sound but no picture that means the Data Display Channel card is good and that there is hope to bringing it back to life.
Now LCDS use ccfl (cold cathode fluorescent) as the back light that means they are not lighting up; for some reason mostly the invert-er that steps up 12vdc or 24vdc to light the ccfl. Check if the invert er is receiving voltage if it is receiving but not stepping it up then the invert er must be changed. If there is light ,sound but no picture then replace the T-CON BOARD
you may need to change the HDMI board in the tv. it will be the hole board the parts are just to small to replace them all to get the HDMI board working again. find a second hand replacement. should be fine with another known working one.
Tv turn on now,does it have a flashes of picture only a few second than dies and than have only sound left?Yes,than the tv 2 long LCD inverter boards are dead.These 2 long LCD inverter boards are one to the left one to the right both must be replace.The 2 long LCD inverter boards job are to help the LCD screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those 2 LCD inverter boards for the replacement.
I just spent an hour trying to fix the VIZIO with the same problem. The screen had no picture at all, but could hear the sound perfectly!! But we i figured out the solution! UNPLUG THE CABLE BOX AND LET IT RE-BOOT! and it WORKED!!!!!