Quote:
Originally Posted by Tony V
It was just installed before i bought the tv so i have no idea about that.
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I put in maybe a thousand HV flybacks in color TVs over the years, but confess to never having used my finger thermometer to test core temperatures after several hours of running, so I don't even know what's normal.
If you have an IR thermometer, take a core temperature and hopefully someone here with a similar chassis can do the same for you for comparison purposes. For all we know, your TV may be normal.
If you think this is something that might affect the long term surviveability, you can remove the fly and see if it does have a cracked core. If the core is cracked *and displaced* even a small bit, it will have eddy losses.
I've repaired late model SMPS transformers with cracked cores by getting the two sections to fit perfectly, and sealing with a FRESH tube of cyanoacrylate adhesive. The cyano won't add any gap whatsoever, but will soak into the ferrite and bond the two sections. Make sure NOT to use the gel type. You want the low viscosity cyano to bond ferrite, ceramic, and other porous hard materials.
If you can get the two pieces to fit perfectly and bond it perfectly, the difference in performance will be virtually indistinguishable from a non cracked one.
Also, what you are experiencing may be normal although disconcerting. I've seen ferrite core transformers have heatsinks strapped to the core.
Maybe adding a heatsink if there's room enough and even a very small, very slow CCF fan will improve the situation to where you won't get wax loss at the core. You would be amazed at low a fan speed you need to drop the temperature of a part contained in an enclosed area.
John