Grundig ST-84-796-9 Fault

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Hi All , i have an 80cm grundig ctv in for repair with the following fault.
Powers up to standby ok but when turned on all you get is a loud ticking
noise.
B+ cycling up and down.Have checked HOT and flyback and ok.
Replaced flyback but fault remains.
Checked diodes and caps in horizontal stage and all seem ok.
Has anyone seen this before.
Cheers
Joe



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