Sony watchman FDL-330S Screen going black issue

[yekwart]

Hi, I’m hoping for a bit of technical help here.

I have a Sony watchman FDL-330S portable TV. https://www.youtube.com/watch?v=nUjJN-Vpkz8 Not my youtube video but same model TV.

It has an issue where when I turn it on it works for only about 30 seconds then the screen goes black but the sound will still be running. If I turn it off, then on again several seconds later, it will work for maybe another 5-10 seconds then go black again. It does this if I am playing a video using the 3.5mm a/v input jack or when I’m just tuned into static, on the analog bands.

I figure this must be a capacitor issue as the device is 30 years old and they have never been changed. But, I thought I should just check here to see if it may be something else. I did open it open and check the capacitors, no obvious damage could be seen, though there were a few capacitors I couldn’t see clearly.

Thanks,