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#1
07-08-2011, 02:54 PM
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Bpc doa
thunder storm yesterday, nearby lighting strike, and now one of my BPC's shows no sign of life. hoping for something simple like a fuse, as I have no clue how to work on these POS's. My vintage stuff just laughs it off.
the CRT is in good shape I wonder if I end up scraping this thing of there is any reason to save the CRT, like in 20 yrs from now will these be sought after. due to the cheapness of them I dont think anyone saves them. Unlike older vintage stuff that actually cost a lot (and there for the folks that actually paid for them did not junk, not until the kids or grand kids got them did the vintage stuff get tossed). Of course with all the NLA parts perhaps even the CRT's will be useles since a chassis could not be repaired. 
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#3
07-08-2011, 04:39 PM
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On a lot of the newer BPC sets, I find that lightning will take out the fuse and one (or more) of the bridge rectifier diodes. Sometimes, the voltage regulator IC or switching transistor will be shorted and there will sometimes be a burnt trace or two in the power supply. If it turns out to be anything deeper, I'd junk the TV.
I've seen lightning strike a TV and only do minor damgae and I've seen it strike a TV and literally turn the PC board chassis to toast. And, I have done extensive repair to lightning damaged TV's; but, that was back when a BPC TV was still worth the effort. Now, I wouldn't go past the power supply.
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#6
07-08-2011, 06:36 PM
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I know it makes little sense to fix this thing, esp with others in line to be fixed, but I guess I am just wondering how you go about trouble shooting something this late? is it a check here then look for this kind of approach? I can barele follow the traces as they are so small.
The relay is not energising. the transformer has 10vac on the secondary from there I get lost quick. I found a single diode that had 10vac on one side of it (compared to other side of the secondary), but on the other side of the diode I get 8vdc? seems odd.
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#10
07-09-2011, 01:54 PM
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I've been wondering for a while now, is it possible to adapt an inline CRT from a BPC set to a vintage TV? Reason being older delta gun CRT's are getting scarce and nobodys rebuilding them anymore. Perfectly good BPC inline tube sets are being tossed out every day so why not try to use them?
Sorry for the sidetrack!
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#13
07-11-2011, 08:06 PM
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I would fix it, its always worth it to learn something new! And you can take this to the bank, someday someone will be saving those sets too. I remember everyone thinking '74 mustangs were junk, and ugly, back in the 90's now they are being restored just like the older ones. All you guys turning your nose up at black plastic crafted tv's should be embracing the last in the generation of crt sets. I have been carefully picking and choosing the free and $10. 20" - 27" BPC sets on CL and just sticking them in the shed. And I use them for our living room set, main watchers. Just like when I was a kid and people were tossing round screen sets and no one thought about it, history repeats. history repeats.
__________________
Yes you can call me "Squirrel boy"
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#14
07-28-2011, 11:53 PM
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I pretty much stopped sharing schematics because no one ever says thank you or anything. Must be that entitlement virus going around. But hey, this is DAVEWM... so, here you go, this should get you going.
Have fun with the surface mount world. 
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