Upon trying to use my Panasonic portable DVD player (DVD-LS90)
I noticed the remote control has no effect on the unit. The battery
is good and makes good contact.

Is there a easy way to determine if the problem is the remote
transmitter or the receiver in the DVD player?


** No.

But an easy way to check if the remote is driving the IR LED with current is
to hold it near a portable AM radio tuned to a blank spot on the dial.

As you press each button a distinctive buzzing should be heard and each
function should sound a little different.


..... Phil