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Frequency display showing row of dots on 432mhz

Kenwood Transceiver ts790 VHF/UHF.
When wanting to use 432mhz the display shows row of dots and fails to function. It will eventually come to life only after prolonged switching on of radio when heated up (2hrs+). No sound can be heard until display shows but this can be muted sometimes suggesting maybe dry joints on PCB.
I have been told this may be due to bad earthing of PLL unit for the 70cms board.
Many thanks if you can oblige.
Dave

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