The Mystery of the Not-So-Dead Pixel

[mythic1310]

I have a Seiki 32" Class LED SE32FY22 TV I've been using as a monitor for about four months now. Tonight I noticed a black spot on the monitor which wouldn't go away when I wiped it with a cloth. My first thought was that it must be a dead/stuck pixel, so I tried to "massage" it away to no effect. Next I tried tapping the screen gently with the edge of a plastic flash drive. To my surprise, this moved the black spot, suggesting it's not a dead pixel as I had thought. Here's a before -

and after -

- you can see that the spot has moved down somewhat on the screen (as well as slightly to the right, but that's less apparent).

I then noticed a pattern which confirmed that there is no "dead pixel". In fact, the pixels themselves are all fine - I tried running UDPixel and noticed that the black spot is actually an inch or two behind the screen. Here's a primitive .gif of what I'm getting at -

- sorry for the low quality! Notice how the black dot at first appears in the center of the flashing box but as the angle changes, the dot passes out of the box. So, what am I looking at here? Is this a speck of dust that somehow got trapped behind my screen? Most importantly, how can I fix this? Thanks very much for your time!

 

[bloc97]

It seems that dust has found its way between the LCD Lighting and the light diffuser sheets. There is no easy solution, you will need to disassemble the LCD Screen itself.
Not only opening the Monitor, but you will have to open the LCD layers itself. If you attempt that, be sure to record everything and do it in a dust-free room. Failure to do either of those will cause you to not be able to reassemble the LCD correctly or get even more dots behind the screen.

Be careful to not touch any 900V Capacitors or crack the screen. Glass can get stuck inside your skin.

The lazy and hassle-free way is to send it for repairs.

Regards,

 

[mythic1310]

It seems that dust has found its way between the LCD Lighting and the light diffuser sheets. There is no easy solution, you will need to disassemble the LCD Screen itself.
Not only opening the Monitor, but you will have to open the LCD layers itself. If you attempt that, be sure to record everything and do it in a dust-free room. Failure to do either of those will cause you to not be able to reassemble the LCD correctly or get even more dots behind the screen.

Be careful to not touch any 900V Capacitors or crack the screen. Glass can get stuck inside your skin.

The lazy and hassle-free way is to send it for repairs.

Regards,

Hrm, I was hoping that wouldn't be the case. Ah well, thanks very much for your answer!