I have a LUMIX FZ28 and the controls do not respond. Any idea of what could be wrong? The camera has an internal battery?

I would send it in for repair. If there are 3 contact pins when there should be 4, you will need that part that holds the pins. It is unusual to have a Service manual for cameras, but here it is and shows disassembly.

https://www.google.com/search?q=panasonic+lumix+fz28+repair+manual


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Previously posted and asked question. Does unit do anything?
Remove and replace battery.

More than one possibility can cause this. Your battery can be on the end of life. Only when the battery works in another camera, of the same model, you can check the capacity. Or with a multimeter, but you must have some electronic skills. Then the contacts on both the battery and in the camera can be dirty or oxidised. Sometimes users manage to put in a battery the wrong way around. This should be virtually impossible with your camera. Try cleaning the contacts in the camera and on the battery, using some cotton swabs. Never use anything sharp.
Then again try charging the battery. Look if the charger light starts green. And is it stops after some time. If you already charged the battery, it could be the light goes out after a few minutes.
If the charger light starts flashing, you know something is wrong with the battery to the connectors. Don't forget to close the battery cover correct. There is a switch, and if the door is not locked correct this switch still indicates open battery door and the camera won't switch on. Check your manual page 17 and 18.

There is no such button. Instead, use the "Copy" command in the Playback menu.

You can erase them as you normally would when you have a memory card in.

To access the pictures in the internal memory, you need to remove any memory card that you have in your camera first. Then go to preview mode, push the trashcan icon and select "Yes" when asked if you are sure you want to delete the picture.

That's all!

CHECK-OUT .....DPREVIEW.COM TESTS

Hello

A the link below you can download the manual requested.

http://www.retrevo.com/support/Panasonic-DMC-FZ28-Digital-Cameras-manual/id/22085bh427/t/2/

Kind regards
Andrea

In the setup menu under "language".

http://www2.panasonic.com/consumer-electronics/support/Lumix-Digital-Cameras/model.DMC-FZ28K

You can download it from here...
Good luck!

You can view / downlaod your instruction manual here

http://www.panasonic.co.uk/html/en_GB/Support/Downloads/220239/index.html#anker_220239