Why does my replacement front panel assembly not work?

I have just received my (2nd) replacement touch screen for my iPod Touch (2 Gen), have plugged it onto the main board, but it does not work. Anyone with any ideas. Maybe there is a trick to installing it. Is it possible that the replacement front panel assembly is faulty? Is it possible to damage the connector plug on the main board?

The previous one worked fine until I ripped the connector by the plug by being too rough. 8-(

(BTW, since having wrecked two ribbon connectors, I have been super careful with this one.)

One final question, the replacement front panel assembly has protective film on both the front and back that need to be removed, correct?