on the blink

Presumably from an appliance with poor electrical connection blinking from intermittent connection.

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on the blink

1. (idiomatic) functioning erratically, malfunctioning; not working or not working well. Usually refers to a mechanical or electrical device.

   My toaster is on the blink, making either charcoal or cold bread.

   • 1968, John Lennon (lyrics), “I'm So Tired”, in The Beatles, performed by the Beatles:

     I'm so tired, I haven't slept a wink / I'm so tired, my mind is on the blink

• (malfunctioning): on the fritz

• “on the blink” in Longman Dictionary of Contemporary English, Longman.
• “on the blink” in the Cambridge English Dictionary, Cambridge: Cambridge University Press.