Sony CD Discman D-5 No Power. Lets Fix it 

Nice work; time for Techknight’s 44.1kHz dance party!

Great job techknight! Impressive to see it come back to life. It is amazing what you can do.

Well done

I have a D7 that I for sure did that reverse polarity thing to when I was younger. Almost assuredly has these similar parts damages as it doesn't power up either. This vid will be a great help fixing it! Thanks!

Good catch! Most people would have called it a day after repairing the main DC-DC convertor. That 8v would have killed the controller. well done sir!

Old Sony gear was built like a tank - this was PEAK Sony era - aesthetics, design, the chonnnnk

I have one of these I got a few years back, and was using it at work before the pandemic. It worked absolutely flawlessly until one day. It skipped a couple times playing a disc. When that one ended and I put in a new one, it had some trouble reading it. And then that was it. It wouldn't even read a disc anymore. I haven't been looking forward to troubleshooting it, knowing that 80s-era Sony portables were just a mess of tiny fragile wires inside. But some day I will, because it's a great little player, and like you saw, even handles CD-R just fine.

0:20 The Sony CDP-101 was the first commercially released CD player for consumers. It was made in 1982. ( en.wikipedia.org/wiki/Sony_CDP-101 )

I have one of these that was acting up but almost worked, and then I accidentally fried it thanks to Sony's infamous center negative power supplies. Now it's a shelf piece. It might be fixable, will try someday...

I've right now on my bench a D-5. I've repaired the DC-DC circuitry, but no sled action or focus search. Do you have any tips?

I have a D-5 with the green switch. The display powers on even when the device is powered off. Any ideas?