Vizio M55-C2 No Picture, Has Sound, Backlights Work
I recently purchased a cheap Vizio 4K led tv in the hope of fixing it. The model is a M55-C2 and the previous owner had it for one year mounted on his wall. The power light turns on and it will either flicker the Vizio symbol for a 1/4 second or be blank when turned on. When I say blank I mean a extremely dim/blueish version of what’s on the screen. Here’s a really interesting part. I can hold the mute button to turn the backlights and panel off (audio only mode) and once I do I lose the dim/bluish picture and just I get a black screen. I then hold the back button to get out of that mode and I get a clear, perfect picture of what’s being played for half a second. It then immediately goes back being dim. I can also get a picture for half a second by unplugging the LVDS cable and then plugging it back in. The sound works perfectly and all the backlights work (removed panel to take a look). All the voltages coming out of the power board seem normal. I called 5 tv repair places and told them my situation and they had varying answers. They said it could be the t-con, bad panel, mainboard, or the backlights. I replaced the t-con, LVDS cable (t-con to main), and currently have another mainboard coming in the mail from Jimmy. They sent me the wrong board in the right box last week. I’m having a lot fun playing with this project but would like to see some progress. The biggest fear is that it’s the panel but I don’t know how it could be if I get a clear picture for half a second. It almost feels like the panel isn’t getting the power it needs. Any help would be much appreciated.