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#1
03-28-2022, 05:15 PM
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19" Sanyo from 1992 that isn't worth fixing
Back in the '90's and very early 2000's, I was seeing a good many Sanyo sets from the 1990's and they were usually easy to fix. They produced a good picture and were better than many of the other bargain-basement TVs.
A few years ago, an older guy that I know brought me this 19" Sanyo for repair. The set worked well, after replacing some bad capacitors, touching up some bad connections, and touching up the greyscale. A few weeks ago, the owner called and said the TV would not turn on and would I look at it. When he brough it, there was no activity (not even a relay click). The 12V for energizing the relay was down to about 9V and the 5V stand-by was at about 3.7V. Before digging further, I jumped the contacts on the relay, to see if the HV would come up. When I did that, one of the rectifier diodes shorted and blew the fuse. I replaced all 4 diodes, just to be on the safe side, and the fuse. Now, with the relay still jumped, I had HV and snow on the screen. The stand-by voltages were still low and after doing some digging, I found the problem to be a defective remote receiver. After removing the remote receiver, the stand-by voltages came up to normal and the set powered on and off as it should have. I dug around in my junk and found a remote sensor, but something told me to turn it on one more time before installing it. When I pressed the power button, the relay clicked, no HV, and then the relay let go. These sets have a protection circuit that will de-energize the relay, if horizontal drive is not detected. After doing some checking, there was no drive at the base of the horizontal driver transistor and even though I'm not 100% certain, I suspect the jungle IC (I have no schematic for this set). I feel like lightning hit this set and even though it might not have fully blown out parts, it might have weakened them to the point of blowing out the next time voltage hit them. Assuming the jungle IC could be found and assuming that it fixed the drive problem, the tuner could have been fried, or it could have played for 5 minutes and something else would have failed. In the past, it's been my experience that sets that experience one failure after another before my very eyes are going to be nothing but trouble and there is no need in spending time on them. This was going to be a free repair, but the owner is the type who'd insist on giving me something. Whatever he gave me would be too much, especially considering that his set might not hold up and considering that sets like this often turn up for free or very cheap. This guy really does not want to replace this set with a flat screen and I can understand that, but there comes a time when you have to let something go. I watch a 38 year old 19" Zenith TV and if it takes a dump, I'll fix it as long as it's quick and cheap. However, if it looks like something that is going to require a lot of money and/or time on my part, it will go bye-bye and be replaced with something else. As far as his Sanyo, If I had a 19" BPC or SPC set, I'd give it to him, but I normally don't even take them because they are too hard to get rid of.
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http://www.youtube.com/user/radiotvphononut 
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#2
03-29-2022, 02:31 PM
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I remember your repair video on that set. I must say that TV did pretty good for being a sany that had a bunch of use. My borther had a sanyo from the late 90s and it had very good picture. It was uesed for many years. Then my grandma went to use TV but she could change the input to rf do to needing the remote. My grandma being someone that things new is better, she but a new TV instead of a remote. I just don't understand some people any way the Tv went into the building for awhile then it was given to me. The av jacks started given intermittent problems doto the jacks probably having bad solider jonts. I was only 8 at the time so I didn't no at the time nore how to fix the TV. I only started fixing CRT TVs and other vintage electronics in 2015 so I'm pretty new to this. Your videos helped me alot with fixing TVs.
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#3
03-29-2022, 04:37 PM
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Today, I tore back in it and when I hit the power button, it fired right up, but that didn't last long. I don't have a print for this set, the free one that I downloaded isn't worth a crap, and I'm not paying $18 for a download that may not be any better than the free one (the TV isn't even worth $18). I soldered the crap out of it and flexed/beat on the circuit board. I don't think the trouble is vibration sensitive and I subbed in a new horizontal driver transistor, to no avail. At that point, I said, "enough of this s***" and slammed it back together. Hopefully, he'll come get it and I'm not taking in any more crap like this. If people want a BPC '90's TV, then go to the thrift store and buy one for $10 or ride around the night before trash pick-up.
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http://www.youtube.com/user/radiotvphononut
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#4
03-29-2022, 09:01 PM
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I surprised both that you'd bother that long on a train wreck like that, and that garbage by you takes TVs.
Out here garbage doesn't take them, and occasionally someone learns the hard way by leaving it outside for a couple of months till it gets run over, copper scrapped, or lit on fire by angry neighbors...
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#5
03-29-2022, 09:08 PM
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I got the horizontal drive to come back up and while it was on, I connected a DTV box, just to see if I could get a picture and it appears that the tuner or tuner control circuit is also jacked up (just more reason for me to condemn it).
I talked to the owner, told him what all I found and that it wasn't worth fixing, and he said he'd pick it up in a few days. He wants it so that he'll have a spare picture tube for his other Sanyo. I think his other Sanyo is a newer one with a small neck tube, but I'm not saying anything because I just want it gone from over here.
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http://www.youtube.com/user/radiotvphononut
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#6
03-30-2022, 08:32 AM
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You spent more time then I ever would have on that TV. I do have BPC TVs and the aren't may favorite by any means but the work so I will keep them. The TV's I have hooked up are 1985 Sony, 1992 GE, 1989 Magnavox console TV, 2002 Sony, 2005 Funai, and late 90s JVC.
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#7
03-30-2022, 06:26 PM
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While the TV itself is long gone, I still have the manual from the TV that was a major part of my childhood, a Sanyo AVM-2501. It wasn't anything revolutionary but it served my family well for 20 years (1990-early 2010s) before it was retired and given away.
https://i.imgur.com/0KeLjXw.jpg
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#8
04-08-2022, 01:09 AM
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He picked up the set and told me that lightning hit it. He also said that lightning hit his late '80's RCA console (I think he said it used a CTC149 chassis). My experience with lightning-damaged RCAs from that era has not been good. Usually, on those sets, I'd find burned traces, destroyed ICs, and/or a destroyed tuner. Those RCAs seemed to never be just a diode and fuse job.
__________________
http://www.youtube.com/user/radiotvphononut
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#9
04-08-2022, 03:20 PM
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Gotta love it. Hit by lightning & didnt tell you.
Other crap they often did was " never been fixed" "its just the power tube" or they just pulled the set from another shop.I could go on....... Even back then honesty was less common than common sense. After CATV came in we started getting lightning jobs that were total losses instead of gravy jobs. If we found blasted trace or burned antenna isolation units we totaled it. Pissed a few people off but a good hit would take out the PS, tuner, half the IC's & a lot of small stuff. Its what EMP will do. enuf fer now 73 Zeno  LFOD ! Quote:
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#10
04-09-2022, 10:18 PM
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Quote:
__________________
http://www.youtube.com/user/radiotvphononut
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#11
04-10-2022, 11:48 AM
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Quote:
the Zenith spark gaps like on the 9-160's. Saw many that the gap was all melted but the sets only needed a fuse. The patent is on this page. https://patents.justia.com/assignee/...oration?page=2 Lots of other interesting Zenith patents. Some we saw. 73 Zeno LFOD !
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