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I realize that this is a old post, but for the sake of anyone else with this issue; I'm visiting my mother and found that she has the same issue. After some investigation, I've been told that this is an issue with something called the "Control PC".
The service tech told me that if it was colored dots, the issue is the "Y Sustain", but white dots are due to the Control PC.
Rough estimate for repair would be in the range of $300 - $400, for a repairman to come out and fix it.
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.
Most times this can be corrected by the correct alignment of the diffusion. The unfortunate part is that will require a tech that knows how to set all of the power supply voltages and then align the diffusion pots on the ysus pwb. This could mean a defective ysus bd. but most times the alignment will correct this problem.
The diffusion is slightly out of adjusment. This timing adjustment is difficult and on a single scan LG plasma the proper operation requires voltage settings first, then a scope to finalize the adjustment. I have good luck with this alignment by eye but have had alot of practice. This will require taking the back off and a person with the technical background to set this alignment properly. Sorry no easy fix.
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