Why does the viewer display a blank screen?

Hi,

We have a Panasonic SDR-H101 and it was working fine till yday. Suddenly the viewer started displaying a white and black screen like vertical lines.

Could you help solve the issue.

Thank you.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0