Panasonic CT-1310M keeps blowing horizontal output transistor

[ARC Tech-109]

At that time I wasn't interested in lugging the brutes around and they were looking to retire, I remember hauling a few of those big 30+ inch CRT's to the bench but never got into the RPTV's. I miss the days of the EZ triplers and sagging 3A3 heaters that took out the flyback.

Getting back to the Panasonic I see so many suspect connections I don't know where to start but D551 anode is just as good as any. First soldering takes a lot more than globbing it on the connections and hoping it conducts, they need to be heated until the solder flows. Those connections on the flyback are not up to par by any means. I see the majority of solder connections have not been touched and they are all suspect until addressed. Soldering is a skill that comes with years of practice, not something you can learn from a book. Honestly I think you bit off more than you can chew with this one.

Originally Posted by luRaichu
Can't power on the set yet so here are pictures of the mainboard I took today. Feel free to pour over them, I cannot see anything wrong myself.

And this is what separates the experienced. just a quick glance I see a halo around the anode of D551, the posts around the DY terminals esp #3 don't look very good. TPB4 looks to be shorting across to the adjacent trace for TPB3 just above R603. All of the connections around the flyback pins need to be reflowed and when I say this I mean heated until the entire solder connection melts and flows around the pin, simply touching the glob is not going to cut it and with all that has been done so far I wouldn't be surprised to find blown semiconductors. You're going to need a lot more luck to get this one working right again.

[JohnCT]

Originally Posted by ARC Tech-109

At that time I wasn't interested in lugging the brutes around and they were looking to retire, I remember hauling a few of those big 30+ inch CRT's to the bench but never got into the RPTV's. I miss the days of the EZ triplers and sagging 3A3 heaters that took out the flyback.

Man, triplers were great - they'd generally arc and burn through and people were so happy when the price to repair the TV was half of what they were afraid of what it would be because of the acrid smoke they'd belch..

As an ASC we had to have a test jig, so I didn't do much lugging. I also cheated a bit - if we had a big tube Sony that was dead, I'd just grab the chassis even though I didn't have any test jig adapters for them and just use a scrapped yoke and HV probe. I kept a bunch of yokes on the shelf for that reason. When I got the power and HV repaired as indicated by the HV probe, I'd just return the chassis.

John

[ARC Tech-109]

Originally Posted by JohnCT

Man, triplers were great - they'd generally arc and burn through and people were so happy when the price to repair the TV was half of what they were afraid of what it would be because of the acrid smoke they'd belch..

As an ASC we had to have a test jig, so I didn't do much lugging. I also cheated a bit - if we had a big tube Sony that was dead, I'd just grab the chassis even though I didn't have any test jig adapters for them and just use a scrapped yoke and HV probe. I kept a bunch of yokes on the shelf for that reason. When I got the power and HV repaired as indicated by the HV probe, I'd just return the chassis.

John

We didn't cheat so much, I was a 20-something who was bigger than his britches and would literally pick those big tube sets up solo and gracefully load them in the van, now at 55 I'm feeling every one of those on every bump I hit on the road... not so graceful today.

[luRaichu]

Originally Posted by ARC Tech-109

TPB4 looks to be shorting across to the adjacent trace for TPB3 just above R603.

No, it is not. See the 2nd pic.

Also, I guess it wouldn't hurt to work on the flyback's pads a bit more, and the other things you'd mentioned too...