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When a DVD, or CD won't read discs, or skips it seems to be a bad pickup about 80% of the time. If a new pickup doesn't fix it, you're left trying to fix a complicated board full of SMD devices. Typically it's not worth the time to even attempt to fix this type of problem.
A lot of DVD players do have simple problems like bad caps in the power supply and mechanical problems. I also see a lot of bad spindle motors. The brushes wear out quickly because DVDs spin at a much higher speed than a CD. Only a few DVD players use brushless spindle motors.
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