Quote:
Originally Posted by BeamT
Nice TV!!
In my opinion your HV is too high. In the pictures you posted, you have a bright screen and the HV is 28KV. This is a 25KV set. The 25EC58 will have 5 Safety Capacitors, 2 mounted on the Horiz Output Transformer, and 3 located under the chassis, that hold the HV down. You have the 2 on the HOT that are clearly the original white American Radionic capacitors that are known to fail open. On your under chassis picture I see 1 of the original capacitors, and maybe that nearby Orange Drop that could be a replacement. You should be able to see the value on the side of the capacitor. They are all connected in parallel to ground but not mounted in the same location. If you follow the blue wire, try and locate the others. As these capacitors open, or are missing, the HV will rise, if they all open, you get the lightning storm Zeno describes. If you have SAMS 1370-2, you are looking for C265, C266, C267, C268, and C272. I have had good luck with this Panasonic Capacitor as a replacement.
ECW-H16182RJV .0018uf 1.6KV
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First of all let me thank you... I'm more of an "expert" when it comes to repairing cars. I just retired from a 30 year career in prototyping and testing, so it's incredibly frustrating to me when I see people (usually facebook) telling others to fire the parts cannon, or repeat a bunch of old-wives tales that don't even relate to the problem. That was exactly the kind of FB advice I was getting. When it comes to TVs, I'm sorta-knowledgeable, but not like I am with cars. I'd be the guy swapping ballast resistors rather than diagnosing a lean fuel condition.
With the schematic and your advice, I was able to locate the 3 under-chassis caps. Someone DID replace ONE of the five... Using the correct part, which means they SHOULD have known to do all five.
...and finally I located this
...which hopefully explains my elevated HV and poor focus
Thanks again for the part# on the caps. I just ordered these:
You mentioned delivery and setup. I can tell you that servicing in the home is quite disruptive, although era-correct shag would make it a little easier than the ice-skating rink terrazzo floor I poured this summer!
