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I had the same red dots in the dark areas and it was driving me nuts. I also have a toshiba 50hp66. Luckily I found out that it's an easy fix. Open up the back of your tv and on the left side you will see two adjustment pots labelled Vsc and Vy. I first marked with a sharpie where the factory defaults were. Then I adjusted down (to the left) the Vy a little and the red spots were gone! My TV looks like new. Hope this helps.
This problem (known as sparkles) can be cured by adjusting the ramp control on the Y-Sustain board. If this does not cure the dots then there is a software remedy for the control board which an LG repair centre could fix. Failing that a replacement board is required. The orbitor & whitewash are like screen savers to help to prevent a screen burn from a permanently displayed image.
The set has sound and no picture.If you the SSB could be the issue but the tiny red dots on a black screen will need the panle replaced also. There is a way troble shooting can be done to determine if you will need the SSB or the SSB and the panel.
1. You've got dead pixels (in this case, the red dots would not move around and are in fixed to certain pixels.) If that's the case, most manufacturers offer warranty replacements, but I'm not sure about Maxent's, you'll need to go to their website, or read the warrenty information which should have come in the box.
2. You're cable/satellite receiver is acting up, try unplugging your receiver and plugging it in after 10 seconds.