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.
for some reason it is blocking the image
here a picture
[Attachment 63273 - Click to enlarge]
Thanks so much
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Last edited by langeloso; 11th Feb 2022 at 03:46.
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Check your RF preamp with the oscilloscope to see how the RF envelope looks like, there are test points that you can find according to the service manual.
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