Poor soldering of flash rom is most likely. Manufacturers are having to use lead free solder and it doesn't flow well in manufacture, causing this type of problem. It's becoming a real headache.
Flash ROM is IC 37001 btw.
Cobweb
December 2005
I can answer this question...
How can I fix my panasonic DVD/VCR player model NV VHD1B?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix dvd players.