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Discussion Starter #1
Re: CRT based RPTV Convergence Repairs

This is my 10 year old Panasonic 32SF35, I've been thinking it's a convergence issue, but don't really know where to start. It seems more severe than the problems discussed. Can someone verify if this is the same issue presented in this forum and recommend which IC's I need to start replacing?



I truly appreciate any help.
 

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Re: CRT based RPTV Convergence Repairs

Your post has been moved to the Panasonic forum to maintain forum organization.

Your problem is not convergence, it is purity. You have a severe magnetic field on your tube and the internal degaussing coil in your set is either not working or is insufficient to demagnetize the tube. It is not uncommon on these sets to have bad connections on the relay or thermistor or have a bad degaussing thermistor. Usually when the thermistor is bad it blows the fuse and the set will be dead. My best guess is a bad solder connection.

It is also possible that a nearby lightning strike can leave this kind of magnetic field on a CRT and the internal degaussing coil is insuffient to clear it up. If this is the case, you will need an external degausser.

Another possibility is that the set has physical damage to the shadow mask due to a shock like being dropped. There is no fix for this other than changing the CRT.
 

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Discussion Starter #3
Re: CRT based RPTV Convergence Repairs

I appreciate the info. Definitely didn't get dropped. Turned it on one day, heard a "pop" and that's what we had. I suppose I should start with checking fuses? Then look for bad solder connections?
 

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Re: CRT based RPTV Convergence Repairs

The fuse is likely fine, or the set would be completely dead.
 

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Re: CRT based RPTV Convergence Repairs

Ok, I manually degaussed and everything looked great, for a couple days. I'll assume that means the coil or the thermistor are shot? Is there a way to test them or just replace them?
 

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Re: CRT based RPTV Convergence Repairs

So the problem came back after manually degussing cleared it? Look for a bad solder joint in the circuit.
 
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