Philips 15PT6807 TV/DVD combo- repair faulty DVD?

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Hi, does anyone know how to fix the 'DEAD DVD' problem on the Philips
15PT6807? Happens on the 14" version as well: 14PT6107

About 9/10 of the DVD drives fail within a few weeks on these units, so
I guess someone must be repairing them!

Symptoms: Blank screen when DVD is selected. No buttons for the DVD
drive work.

Any help greatly appreciated

Cheers...