JVC HR-D721EN black image only sound

JVC HR-D721EN black image only sound

"hello, from uruguay

I have two vhs jvc version HR-D721EN and both play with sound but black image, I already cleaned the heads and it's still the same, if I fast-forward there you can see the rain but then it's black with the play logo. any idea how to repair it or a circuit that is wrong.

here a picture"

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