just try to replace true/false object with string('true' / 'false') in there. and it should work fine.

function onChange(control, oldValue, newValue){

  if (newValue == 'true') {

  g_form.setValue('u_member_firm_impacted_nrfa', 'true');

  g_form.setValue('u_member_firm_impacted_nrfcan', 'true');

  g_form.setValue('u_member_firm_impacted_nrfllp', 'true');

  g_form.setValue('u_member_firm_impacted_nrfsa', 'true');

  g_form.setValue('u_member_firm_impacted_nrfus', 'true');

  }

  else{

    g_form.setValue('u_member_firm_impacted_nrfa', 'false');

    g_form.setValue('u_member_firm_impacted_nrfcan', 'false');

    g_form.setValue('u_member_firm_impacted_nrfllp', 'false');

    g_form.setValue('u_member_firm_impacted_nrfsa', 'false');

    g_form.setValue('u_member_firm_impacted_nrfus', 'false');

  }

  }