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The dimmer is very eratic. It will start out at 100 and then get dimmer at 90, 80, turn OFF at 70 (black screen), come on a little brighter at 60, full bright at 50, etc. Also, if I set it to 100 and keep turning the knob to the right, the display will change brightness while all the while saying 100%.
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Ruffles gave a very good description of this problem...

Am I correct in assuming only about 7 or 8 people have this problem, or is it more widespread then that...???

Does anyone notice that it doesn't happen all the time? My player was fine for about a week, then it happened again. Then I messed around wiggling the ac connector and plugged it back into my truck and it was fine for a day, now it's messed up again. Everytime I think I figured out what it is, reproducing those same steps again to fix it doesn't work.