Pioneer CLD-99 VWR1200 power supply board

[Electronic M]

L1 is a line RF noise filter choke as I suspected. Any differential noise* on the power line from the switch mode transistors or the wall outlet will cancel it's self out.

* Common mode noise is not as prevalent.

If that was a working LD player you could replace that with 2 jumpers and it would still work (though there could be more noise in the picture and sound with it gone).

Almost every modern switch mode power supply has one of those, and one from just about any other device that has one will work as a replacement...if you have a junk power supply from something else with a dual line choke like that that will physically fit it should be a usable replacement.

[Notimetolooz]

Switching power supplies are not easy to troubleshoot. The power levels are high and the safety margins are thin. Because they use feedback circuit methods it is difficult to isolate the problem.
If you want to be successful with electronics you cannot just use parts you happen to have on hand at the moment, there are too many variations and you know too little.
Modern electronics are harder to find the right parts for because things are seldom documented well because few people will have them repaired. The repair costs are too high. Most people will simply buy a new unit.

Please do not open many threads on one unit. It is rude.