Blown fuse in convergence circuit


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Blown fuse in convergence circuit

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drvstrnz
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Nov 25, 2003, 12:00 AM

Post #1 of 2 (2294 views)
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Blown fuse in convergence circuit	Can't Post

How can I identify the blown fuse in a convergence circuit?

I have a Toshiba TP48D50.

I have narrowed it down to this, the "+" won't adjust the convergence, thus the ic's are bad and have blown an inline fuse, I can find the ic's but can anyone help me locate the inline fuse?

Either by color shape or size or all of the above.

marty_dawson
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Jul 29, 2004, 8:03 AM

Post #2 of 2 (2126 views)
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Re: [drvstrnz] Blown fuse in convergence circuit [In reply to]	Can't Post

There should be 2 2A 'picofuses', F701 and F702. The originals are rectangular, black w/ axial leads, but any type pico or pigtail fuse will work if you can make it fit. They fuse the 32V and -32V supplies for the STKs. If either are blown, one of the STKs may be shorted to ground, if one's bad I usually replace them both. However I have one right now that makes the R/B (front) STK run hot and will play about 30 min before knocking out the -32V fuse. Toshiba told me to check all the 2.7 ohm 2W resistors, I've checked them twice and can't find any out of tolerance, but they claim that can cause STK and fuse failures. I think the one I have has a problem with the drive input, just ain't figured it out yet. Hope yours is easier than this one Smile

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