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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Dec 31, 2013 1:21 am Post subject: |
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Great pictures.
2 things
1: can you get me a picture of the back side of that board also? I only need the half where we are looking.
2: Set your DMM to diode scale and test across those 2 AC input pins and tell me what you get.
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Dec 31, 2013 1:40 am Post subject: |
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Ok, back. Used a different pic host because the other one said this pic was too big:
http://minus.com/i/bl3WjoHbvBMv7
In "diode mode" across the AC input pins I get OL, but there's no fuse, remember....
(Again, keep clicking on the photo to get it really big....)
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Dec 31, 2013 1:47 am Post subject: |
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Oh yeah, no fuse, lol. Do you have another fuse to snap in? I could have you test on the back but we may be trying it again so you will need a good fuse in there anyways.
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Dec 31, 2013 2:10 am Post subject: |
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Ok, wrapped a piece of solder to bridge the fuse, measured across the AC input points, and it read 0.00 in "diode mode".
I *might* have a fuse I can put in, but I want to put off rooting around in the -14 C garage as long as possible...
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Dec 31, 2013 2:20 am Post subject: |
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No problem, that's good for now. We are showing the short. According to the pic of the bottom of the board your part is not a DS but rather a VS, and 2 of them yet. Are you able to at least unsolder these 2 devices, VS101 and VS102?
If you can remove them then after they are out test on those 2 AC pins again and see what you get.
I will probably be going offline soon so i will check back tomorrow and see how you made out.
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Dec 31, 2013 2:26 am Post subject: |
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Thanks, I'll try that, btw, I found a 250V 2A fuse in an old SEOS board, put that in, and got the same result...
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Dec 31, 2013 2:49 am Post subject: |
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With those two diodes clipped, I get a reading across the AC pins that climbs steadily till it reaches OL...
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Dec 31, 2013 2:59 am Post subject: |
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You can try turning it on with those out but you will need a larger fuse then that 2 amp you found. Those MOV's suppress minor surges so the fuse may be more susceptible to blowing so don't connect any inputs with it turned on if it does come on. Turn off, then make connections and then turn on. Remember, at least an 8 amp fuse but it can be a 120volt one.
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Dec 31, 2013 3:01 am Post subject: |
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Ok, I tried it with the 2A fuse and blew it right away*(before I read your response)...I've got to buy some fuses now, or dig out the old 808 chassis buried in my garage, hahahah...
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Dec 31, 2013 3:26 am Post subject: |
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So, found a 6A/250V fuse in an old Ampro board, tried it in the Toshiba power board with the two diodes clipped, and it powered on and showed 'No Signal'....
Do I *need* to replace those diodes, or just leave that fuse in and go for it ?
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Dec 31, 2013 5:05 am Post subject: |
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So I went for it, haha, unplugged, connected a computer via HDMI, replugged and turned on via power switch, it works.
So, is it important to replace those diodes, or not....it will be a dedicated computer monitor, if that makes any difference...
Also, does anyone know if there is a "secret" menu in this set that will tell me the hours, etc. ?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Dec 31, 2013 3:02 pm Post subject: |
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You can run it without those MOV's. It just may blow a fuse occasionally for no reason. Or a good surge may take out a component.
Hours are meaning less like miles on a car. If you need the service menu for something important I can look it up.
So do you feel like a repair tech now, LOL?
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Dec 31, 2013 10:45 pm Post subject: |
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| macgyver655 wrote: | | So do you feel like a repair tech now, LOL? |
Ha, ha, I wish...if I could ever learn to solder...and de-solder...and understand circuits...then, MAYBE, I'd feel like a tech !
Just borrowing your expertise makes me feel grateful, thanks very much for the insight, but I likely feel LESS like a tech now, seeing how little I know about this stuff, haha.
Seriously, thanks very much for the help. I do love rescuing stuff that would have otherwise been scrapped...
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 01, 2014 2:32 pm Post subject: |
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| Elaine Benes wrote: | | . I do love rescuing stuff that would have otherwise been scrapped... |
And it's even better when it doesn't cost anything to repair.
You may want to consider plugging it into a surge protector. They use the same type protection as what you clipped out. If you could solder you could of probably robbed the parts you need out of one. But plugging it into one should give equal protection as to what it had. Nothing expensive, just a cheapie should do fine.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 01, 2014 2:42 pm Post subject: |
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Oh, and just for your own knowledge, those 2 devices in your circuit are called TVS. Same function pretty much as a MOV but handles higher voltages and faster response. Of course I guess they didn't handle what ever this time, lol. But they probably did there job since nothing else was damaged.
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Wed Jan 01, 2014 3:10 pm Post subject: |
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Thanks again for all the knowledge. I've got several good quality surge protectors I can plug it into.
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