xconv is replacement for iconv. In case after you use xconv, you always get a blank page, try do this:

For xconv v1.63:

line 44 of class/xconv.php:
if(!($this->getConvFunc())) $this = false;
change it to
if(!($this->getConvFunc())) unset($this);

The old version may result in the following error for some PHP:
Fatal error: Cannot re-assign $this in /XOOPS_ROOT/modules/xconv/class/xconv.php on line 44