Quote:
Originally Posted by technoman9
Tonight I did as you suggested and measured the B+ voltage at pin 4 of the LV regulator, which I presume is the same thing as the B+ regulator, aka THE regulator. You can see it in the attached image; it's an STR3115.
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Yep, that's a 115V regulator. These do require a load so you can't measure the output with the TV in shutdown to get an accurate reading. If the sweep is running, you can get an artificially high B+ reading because a weak or open bypass cap will feed back to the regulator.
Still, you should not be getting a shorted reading across the big pass resistor, so the regulator is bad.
As Zeno says, careful where you get them. I just checked and don't have any of these left, but you might be able to find old stock somewhere including the bay.
Quote:
Originally Posted by technoman9
I will check the flyback bypass capacitors tomorrow, I believe those are C437 and C443 in the second image, correct?
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C443 is the bypass filter for the 177 volt line and won't cause the shutdown but will cause pic issues.
C437 is the cap that snubs voltage spikes from the sweep when it's running, and this cap will cause excessive B+ even if the regulator was good. I'd change them both anyway.
John