Many devices look like crap when using different connections.
The xbox360 looks great on hdmi and component but looks like like crap on VGA. Then they had to have an update to fix it.
Try to update your firmware. and see how it does.
TV will display whatever signal it is designed to to accept. Sometimes you have to change the settings to have it display correctly. If you cannot resolve it then use POE to see which one is causing the problem.
Plus device into another TV of same settings/specs to see if it still look like crap. If it does then it's your device.