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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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What to replace a blown voltage regulator... Cross referencing...
I'm trying to fix a netvista mobo that shot the bucket...
3 caps and one (I think it is a voltage regulator) blew the roost. I'm looking for replacement information on the regulator CET CDB6030L (delta)13U1A I just need to know what item I can order or get at RadioShack or some online seller, or find as commonly found spare on tossaway boards (I rip apart alot of junk for fun, so maybe I can find one on a mobo somewhere). Your help is apreciated. NOTE, I lost 3 caps (at least visually they are the only other parts fried) which I know the values, 1500uF at 10V, I can and will find them, just wondering if I can replace them with higher Volt rating caps if found and also high uF rating without damaging the mobo. These components, the Regulator and the 3 caps make up part of the Voltage Regulator Module on the mobo, integrated, not seperately plugged in. I'm hoping to salvage the mobo and get this running again. Thank you, please email me directly. The biggest issue is to find a replacement (hopefully cheap) either from RadioShack, spare parts, or someone like Mouser or the like for the Regulator listed above. I don't read online USENET any more, so please email me directly. I really appreciate your thoughts and help! Best wishes. |
#2
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What to replace a blown voltage regulator... Cross referencing...
"Todd Nathan" wrote in message m... I'm trying to fix a netvista mobo that shot the bucket... 3 caps and one (I think it is a voltage regulator) blew the roost. I'm looking for replacement information on the regulator CET CDB6030L (delta)13U1A I just need to know what item I can order or get at RadioShack or some online seller, or find as commonly found spare on tossaway boards (I rip apart alot of junk for fun, so maybe I can find one on a mobo somewhere). Your help is apreciated. NOTE, I lost 3 caps (at least visually they are the only other parts fried) which I know the values, 1500uF at 10V, I can and will find them, just wondering if I can replace them with higher Volt rating caps if found and also high uF rating without damaging the mobo. These components, the Regulator and the 3 caps make up part of the Voltage Regulator Module on the mobo, integrated, not seperately plugged in. I'm hoping to salvage the mobo and get this running again. Thank you, please email me directly. The biggest issue is to find a replacement (hopefully cheap) either from RadioShack, spare parts, or someone like Mouser or the like for the Regulator listed above. I don't read online USENET any more, so please email me directly. I really appreciate your thoughts and help! Best wishes. I'm 99% sure that is a Mosfet, not a voltage regulator. It is used as a switching transistor in the switchmode regulator. I'm not sure you'll find an exact replacement easily, you might be stuck with finding a similar spec device. What makes you think it is faulty? Obviously if it's cracked then it is bad. However there's other components can fail causing over voltage in these circuits, check the Mosfet for shorts first, it may be OK. The bad capacitors themselves may have been the fault, it's pretty common on motherboards. Dave |
#3
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What to replace a blown voltage regulator... Cross referencing...
"Todd Nathan" wrote in message Ok, I'm not knowledgable, but I can include an image for you to see, just email me and I'll zap it back to you. What makes you think it is faulty? The legs/leads on it were melted, disconnected, and the back grounding (assuming it is grounding) that was soldered to the mobo was burned off and thus it was lifted off (about 2-3 mm) off the mobo. it is fried, no question, charded mobo under it too. I figured if the caps can be salvaged from another scrap board, and this item (whatever it is) that was right next to the 3 caps that blew (1500uF @ 10V) and expanded, oozed out, could be had for cheap, I can fix it myself. 1.1 Ghz cpu, IBM mobo and components, maybe I get 'free' DVD/DivX player to go on top of TV OK, I've looked at the photos. The Mosfet has shorted causing overvoltage on the output of the regulator. Maybe the caps caused this, maybe the shorted Mosfet caused the caps to go bad, who knows. One other possibility is something downstream overstressed the Mosfet, like a bad CPU. Have you checked the processor in another mobo? I really think you'll have trouble sourcing that Mosfet new. You may find a spare dead mobo with a good one, I've seen these Mosfets on countless mobos, and subbing it, and all the faulty caps, might get you working. However, the survival of the CPU should be checked out, and I'm not sure I'd want to put in another CPU to test it after the repair! BTW, I hope you cleaned that electrolyte of the mobo ASAP, it doesn't do the traces any good! Dave |
#4
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What to replace a blown voltage regulator... Cross referencing...
MOSFETs are among the most substitution-friendly parts I've come across, I
wouldn't be surprised if some random mosfet worked just fine there, but it would surprise me if nothing else was damaged. "Dave D" wrote in message ... "Todd Nathan" wrote in message Ok, I'm not knowledgable, but I can include an image for you to see, just email me and I'll zap it back to you. What makes you think it is faulty? The legs/leads on it were melted, disconnected, and the back grounding (assuming it is grounding) that was soldered to the mobo was burned off and thus it was lifted off (about 2-3 mm) off the mobo. it is fried, no question, charded mobo under it too. I figured if the caps can be salvaged from another scrap board, and this item (whatever it is) that was right next to the 3 caps that blew (1500uF @ 10V) and expanded, oozed out, could be had for cheap, I can fix it myself. 1.1 Ghz cpu, IBM mobo and components, maybe I get 'free' DVD/DivX player to go on top of TV OK, I've looked at the photos. The Mosfet has shorted causing overvoltage on the output of the regulator. Maybe the caps caused this, maybe the shorted Mosfet caused the caps to go bad, who knows. One other possibility is something downstream overstressed the Mosfet, like a bad CPU. Have you checked the processor in another mobo? I really think you'll have trouble sourcing that Mosfet new. You may find a spare dead mobo with a good one, I've seen these Mosfets on countless mobos, and subbing it, and all the faulty caps, might get you working. However, the survival of the CPU should be checked out, and I'm not sure I'd want to put in another CPU to test it after the repair! BTW, I hope you cleaned that electrolyte of the mobo ASAP, it doesn't do the traces any good! Dave |
#5
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What to replace a blown voltage regulator... Cross referencing...
"Dave D" wrote in message ...
"Todd Nathan" wrote in message Ok, I'm not knowledgable, but I can include an image for you to see, just email me and I'll zap it back to you. What makes you think it is faulty? The legs/leads on it were melted, disconnected, and the back grounding (assuming it is grounding) that was soldered to the mobo was burned off and thus it was lifted off (about 2-3 mm) off the mobo. it is fried, no question, charded mobo under it too. I figured if the caps can be salvaged from another scrap board, and this item (whatever it is) that was right next to the 3 caps that blew (1500uF @ 10V) and expanded, oozed out, could be had for cheap, I can fix it myself. 1.1 Ghz cpu, IBM mobo and components, maybe I get 'free' DVD/DivX player to go on top of TV OK, I've looked at the photos. The Mosfet has shorted causing overvoltage on the output of the regulator. Maybe the caps caused this, maybe the shorted Mosfet caused the caps to go bad, who knows. One other possibility is something downstream overstressed the Mosfet, like a bad CPU. Have you checked the processor in another mobo? I have no other mobo to test the CPU, however I will look around. I undrestand your concerns about putting a good working CPU into a 'fixed' board to test the board repair. I would not do such a thing. I was told this machine/mobo took a good zap in a storm. I see the discoloration from the heat of the Mosfet around the location. Other than the discoloration I don't see any other damage (in the photos, things are cleaned up a bit now) other than this, no trace pealing or board delamination. I'm confident I can do the repairs, whether or not that works and I'm back running is another issue. The obvious we look, the not-so-obvious I am not skilled enough to know or see. I really think you'll have trouble sourcing that Mosfet new. You may find a spare dead mobo with a good one, I've seen these Mosfets on countless mobos, and subbing it, and all the faulty caps, might get you working. However, the survival of the CPU should be checked out, and I'm not sure I'd want to put in another CPU to test it after the repair! I'll look around, I don't know what I'm looking for, but if our other posting friend is correct, and Mosfets are fairly interchangable, then I just need to find one that works. I'm not sure what a Mosfet does, or how to verify it works. I have a voltage meter from Radio Shack, so if that would help, this could get quite easy with the correct information. BTW, the caps are 1500uF @ 10V and maybe I can find some of those on other boards. Can I safely use a higher rated uF and V on a replacement cap (say a 2000 or 2200uF rated at 12 or 15V?). BTW, I hope you cleaned that electrolyte of the mobo ASAP, it doesn't do the traces any good! I used 99+% rubbing as soon as I found the problem, and the board is really clean. My concern for oxidation or errosion was also of a concern. Dave Thanks for all your help, and I'm glad the pictures seemed to help out quite a bit. The noticably visible non missing mosfet next to the one that was burned off and removed in the photos is IDENTICAL to the one that I removed prior to the pictures being taken. It was burned off, and lifted, so I figured I may as well remove it, then I thought to take some photos. The caps are now off, and the board is now cleaned. 99 cents of 99% rubbing alcohol is nice price So would working components from a mobo or PS, something electronic and scrapped. Todd |
#6
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What to replace a blown voltage regulator... Cross referencing...
"Wong Sy Ming" wrote in message ...
I would bet that a suitable replacement would be the FDB6030L from Fairchild. Wong Thank you, would seem that is the same number 6030, and maybe the FDB is the fairchild lettering? Any recommendation on sourcing Fairchild FDB6030L? Really appreciate your help and advice. Finding caps now, do you think that a 2000/2200 uF at 10+ volts is fine also? [ ... stuff deleted for brevity ... ] |
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