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Bumping this thread because I had the same symptoms on an Instek GOS-620, which is pretty much identical. In my case, Pin 3 of the HV Transformer (T601) had a bad trace to R623. It wasn't visible, but tested open. No initial symptoms, just one day, no display. A little cleaning and a solder bridge onto the trace was enough to repair it successfully. Thanks to BradtheRad!
Your post showed up in my update list. Glad to hear it took just a bit of detective work by you, to get your scope working. Your clicks on the 'Helped Me' button were appreciated.