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Bought a Black G74 and it turns on and I hear it degausse like it should but no video

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    It wouldn't normally kill the flyback transformer but it could kill the Horizontal output transistor and its driver circuitry and possibly the gun driver transistors. But there is no absolute proof there is air in the CRT yet. Usually, if there is, the CRT heater reacts with the air and burns up leaving a white smoke like deposit on the inside of the neck , near the CRT's base.

    So, if it were my monitor, despite finding that crack in the glass, I would proceed with the usual investigations, just in case the CRT has not let down to air yet.


      Yeah I will try that and see what happens, hopefully it is still fixable.


        It might be possible to put some glue over the crack to keep it from getting air. I'm not sure which I would use, but I think I would try that if it was me.


          This one looks promising. It's advertised as being designed for patching vacuum leaks


            I have patched over a crack in a vintage TV CRT once 20 years ago, successfully, the CRT is still working. I used a product called TORR SEAL, made by Varian Vacuum. It is a white two part epoxy resin. But it is costly. It is a very low vapor pressure resin.

            Edit: this is the product:


            Probably, a quick check would be the continuity of the CRT's heater. If that was ok, then the heater at least has not been running in air. Another check could be to power the heater with a power supply, most heaters, are 6.3V. If it behaved normally then likely the CRT is still under vacuum.

            Probably though the best bet initially is to fault find the set in the usual manner.
            Last edited by Hugo Holden; May 12, 2021, 02:31 PM.


              Wow, that's probably more expensive than what the set's worth. But it's good to know it exists. If I got a crack on anything really valuable, I'd try that.

              Personally, I'd still try the loctite that advertises vacuum stability, it's less than $20 and might work. I'd also probably do it and let it cure for at least 2 days before I so much as breathed on that thing again.


                Originally posted by vol.2 View Post
                Wow, that's probably more expensive than what the set's worth. But it's good to know it exists. If I got a crack on anything really valuable, I'd try that.

                Personally, I'd still try the loctite that advertises vacuum stability, it's less than $20 and might work. I'd also probably do it and let it cure for at least 2 days before I so much as breathed on that thing again.
                I might try finding a beige G74 that works and switch all the guts out, the CRT, and the Board cause it is exactly the same other then a black case, Haven't decided for sure yet though.