Chosen Solution
My tv screen stays black when turned on but I have sound
Sean colgan, it seems most likely that the problem is either the backlight or the power supply for it. Samsungs have a well-known issue with bad caps in the PSU section. Check those first. Of course you do want to make sure that your TV is unplugged. Leave it unplugged for a couple of hours (overnight) Of course you also want to try a different video source. More information when we know what model this is. Check the diodes on the power supply. Those have a tendency of failing on this model.
Maybe you got problem with your backlight. What tv you use? Led or Lcd? If you use Led tv mybe LED at the backlight is broken. Check your led with multimeter 1xohm. Detect which one not working and replace it. You can order your led at taobao.com
Unplug and remove back.Check all ribbon cable connections. Make sure they are all fully seated.Put back on and check.If still nothing, see if led backlight is working by turning on in a dark room. Should see slight glow if led is on.
