Since that set is completely digitally controlled for all adjustments,
it is highly unlikely any adjustment is going to fix the problem. You
have a parts failure that needs to be repaired. Could be in either the
h-deflection or video h-phase circuit.

Although possible, the eeprom could have become corrupted, in which
case the full chassis alignment will need performed after replacement
per the service manual.

Time to take it into a JVC experienced shop that has the service manual
and equipment on hand in order to complete a diagnosis and repair.