Strange display problems with Apple II

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Strange display problems with Apple II

I plugged my Apple II original (Rev 1) into a PAL/NTSC dual plasma TV (i.e. modern flat screen)
On start-up I only get a black and white screen with vertical bars and a flashing cursor
The cursor moves when I type a key and goes to a new line when I hit return.

The RESET button gives a beep and all keys are responsive. It only seems to be a display problem.

I tried reseating the chips. Also tried plugging the video cord into the SupRMod II. Make no difference

Has anyone else encountered this issue? How can I fix this?