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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Sanyo DS-31650 shutdown - here we go again! :)
Hey guys, left a post about this Sanyo 31" DS31650 TV a while back, that had
a bad flyback and HOT. After replacing the set would turn on, but only for about 3 seconds and then turnoff. Repeating pressing of the on switch will get the tube to light up enough to show there is a raster, but no video. Sound is fine. The customer decided to buy a new set right after this one was brought in to me, and said he was in no hurry to fix it, so I set it back while I had more pressing things to work on. Now I would like to get it out of the shop. Before I order a schematic on this thing, I was wondering if anybody had at least enough info on this chassis for me to take a crack at fixing it without the schematic. The problem is the set won't stay on long enough to do much. I'm sure the micro is tripping the set and shutting it off, but I don't know if it might be the micro itself, which some have claimed to replace and solve this problem, or whether the lack of a video signal, is tripping the micro. If anybody has any info, schematic, or at least the correct voltage points/waveforms to check that would cause the micro to shut down, it would be appreciated. If not, I'll probably just order the schematic and a new micro. I just hate rapping much money up in this thing, since I doubt it will have all that much more life left in it. Thanks! |
#2
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Sanyo DS-31650 shutdown - here we go again! :)
If it is on 3 seconds or so, the micro is not seeing either the h-pulse or
the v-pulse to tell it that both circuits are running. Since the flyback was back look for a line that goes to a zener diode that gets buffered and goes to the micro for the h-sync pulse. David BigMike wrote in message m... Hey guys, left a post about this Sanyo 31" DS31650 TV a while back, that had a bad flyback and HOT. After replacing the set would turn on, but only for about 3 seconds and then turnoff. Repeating pressing of the on switch will get the tube to light up enough to show there is a raster, but no video. Sound is fine. The customer decided to buy a new set right after this one was brought in to me, and said he was in no hurry to fix it, so I set it back while I had more pressing things to work on. Now I would like to get it out of the shop. Before I order a schematic on this thing, I was wondering if anybody had at least enough info on this chassis for me to take a crack at fixing it without the schematic. The problem is the set won't stay on long enough to do much. I'm sure the micro is tripping the set and shutting it off, but I don't know if it might be the micro itself, which some have claimed to replace and solve this problem, or whether the lack of a video signal, is tripping the micro. If anybody has any info, schematic, or at least the correct voltage points/waveforms to check that would cause the micro to shut down, it would be appreciated. If not, I'll probably just order the schematic and a new micro. I just hate rapping much money up in this thing, since I doubt it will have all that much more life left in it. Thanks! |
#3
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Sanyo DS-31650 shutdown - here we go again! :)
I think I would check the 200 volt line. The timing sounds about right. Beam
current starts, gets excessive, shuts down. Mark Z. "BigMike" wrote in message m... Hey guys, left a post about this Sanyo 31" DS31650 TV a while back, that had a bad flyback and HOT. After replacing the set would turn on, but only for about 3 seconds and then turnoff. Repeating pressing of the on switch will get the tube to light up enough to show there is a raster, but no video. Sound is fine. The customer decided to buy a new set right after this one was brought in to me, and said he was in no hurry to fix it, so I set it back while I had more pressing things to work on. Now I would like to get it out of the shop. Before I order a schematic on this thing, I was wondering if anybody had at least enough info on this chassis for me to take a crack at fixing it without the schematic. The problem is the set won't stay on long enough to do much. I'm sure the micro is tripping the set and shutting it off, but I don't know if it might be the micro itself, which some have claimed to replace and solve this problem, or whether the lack of a video signal, is tripping the micro. If anybody has any info, schematic, or at least the correct voltage points/waveforms to check that would cause the micro to shut down, it would be appreciated. If not, I'll probably just order the schematic and a new micro. I just hate rapping much money up in this thing, since I doubt it will have all that much more life left in it. Thanks! |
#4
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Sanyo DS-31650 shutdown - here we go again! :)
"David" wrote in message ... If it is on 3 seconds or so, the micro is not seeing either the h-pulse or the v-pulse to tell it that both circuits are running. Since the flyback was back look for a line that goes to a zener diode that gets buffered and goes to the micro for the h-sync pulse. David Thanks David, I'll give it a look. I have a raster for those 3 seconds, just no video. However, I can see faint retrace lines in the raster, but it's hard to tell if that might just be the screen control set too high, since all I can see on the screen is the on-screen menu for those couple of seconds. Anyway, I'll check it out. Thanks again. BigMike wrote in message m... Hey guys, left a post about this Sanyo 31" DS31650 TV a while back, that had a bad flyback and HOT. After replacing the set would turn on, but only for about 3 seconds and then turnoff. Repeating pressing of the on switch will get the tube to light up enough to show there is a raster, but no video. Sound is fine. The customer decided to buy a new set right after this one was brought in to me, and said he was in no hurry to fix it, so I set it back while I had more pressing things to work on. Now I would like to get it out of the shop. Before I order a schematic on this thing, I was wondering if anybody had at least enough info on this chassis for me to take a crack at fixing it without the schematic. The problem is the set won't stay on long enough to do much. I'm sure the micro is tripping the set and shutting it off, but I don't know if it might be the micro itself, which some have claimed to replace and solve this problem, or whether the lack of a video signal, is tripping the micro. If anybody has any info, schematic, or at least the correct voltage points/waveforms to check that would cause the micro to shut down, it would be appreciated. If not, I'll probably just order the schematic and a new micro. I just hate rapping much money up in this thing, since I doubt it will have all that much more life left in it. Thanks! |
#5
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Sanyo DS-31650 shutdown - here we go again! :)
"Mark D. Zacharias" wrote in message rthlink.net... I think I would check the 200 volt line. The timing sounds about right. Beam current starts, gets excessive, shuts down. Mark Z. I'll give it a look. Thanks! "BigMike" wrote in message m... Hey guys, left a post about this Sanyo 31" DS31650 TV a while back, that had a bad flyback and HOT. After replacing the set would turn on, but only for about 3 seconds and then turnoff. Repeating pressing of the on switch will get the tube to light up enough to show there is a raster, but no video. Sound is fine. The customer decided to buy a new set right after this one was brought in to me, and said he was in no hurry to fix it, so I set it back while I had more pressing things to work on. Now I would like to get it out of the shop. Before I order a schematic on this thing, I was wondering if anybody had at least enough info on this chassis for me to take a crack at fixing it without the schematic. The problem is the set won't stay on long enough to do much. I'm sure the micro is tripping the set and shutting it off, but I don't know if it might be the micro itself, which some have claimed to replace and solve this problem, or whether the lack of a video signal, is tripping the micro. If anybody has any info, schematic, or at least the correct voltage points/waveforms to check that would cause the micro to shut down, it would be appreciated. If not, I'll probably just order the schematic and a new micro. I just hate rapping much money up in this thing, since I doubt it will have all that much more life left in it. Thanks! |
#6
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Sanyo DS-31650 shutdown - here we go again! :)
"Mark D. Zacharias" wrote in message thlink.net... Yeah, now it REALLY sounds like the 200 volt line. Mark Z. I have a raster for those 3 seconds, just no video. However, I can see faint retrace lines in the raster Yeah, it does. I will try to track it down tomorrow and I'll let you know. "bigmike" wrote in message m... "David" wrote in message ... If it is on 3 seconds or so, the micro is not seeing either the h-pulse or the v-pulse to tell it that both circuits are running. Since the flyback was back look for a line that goes to a zener diode that gets buffered and goes to the micro for the h-sync pulse. David Thanks David, I'll give it a look. I have a raster for those 3 seconds, just no video. However, I can see faint retrace lines in the raster, but it's hard to tell if that might just be the screen control set too high, since all I can see on the screen is the on-screen menu for those couple of seconds. Anyway, I'll check it out. Thanks again. BigMike wrote in message m... Hey guys, left a post about this Sanyo 31" DS31650 TV a while back, that had a bad flyback and HOT. After replacing the set would turn on, but only for about 3 seconds and then turnoff. Repeating pressing of the on switch will get the tube to light up enough to show there is a raster, but no video. Sound is fine. The customer decided to buy a new set right after this one was brought in to me, and said he was in no hurry to fix it, so I set it back while I had more pressing things to work on. Now I would like to get it out of the shop. Before I order a schematic on this thing, I was wondering if anybody had at least enough info on this chassis for me to take a crack at fixing it without the schematic. The problem is the set won't stay on long enough to do much. I'm sure the micro is tripping the set and shutting it off, but I don't know if it might be the micro itself, which some have claimed to replace and solve this problem, or whether the lack of a video signal, is tripping the micro. If anybody has any info, schematic, or at least the correct voltage points/waveforms to check that would cause the micro to shut down, it would be appreciated. If not, I'll probably just order the schematic and a new micro. I just hate rapping much money up in this thing, since I doubt it will have all that much more life left in it. Thanks! |
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