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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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#1
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dead motherboards...
hi people..
im interested in repairing computers motherboards.. mostly the older ones ( based around socket 370, socket A and lower) and have some questions... when there is a motherboard fried from a power surge, is it worth trying repairing? what components usually die in such situations? how to check all those SMD componentes and small ICs on easiest way to find out if they work or no? well, any info about such problems is needed... thanks in advance bye -- hr.rec.ronjenje °((( contact me: |
#2
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dead motherboards...
On Sat, 19 May 2007 12:02:38 +0200, Papcina
wrote: hi people.. im interested in repairing computers motherboards.. mostly the older ones ( based around socket 370, socket A and lower) and have some questions... when there is a motherboard fried from a power surge, is it worth trying repairing? Never. There are zillions of these out there you can get for free, so why try to fix one? what components usually die in such situations? how to check all those SMD componentes and small ICs on easiest way to find out if they work or no? well, any info about such problems is needed... thanks in advance bye |
#3
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dead motherboards...
You will find that the economics of the repair parts and your time -- may
not make sense. For your overall education (and a leading cause of many failures) http://www.badcaps.net/ http://en.wikipedia.org/wiki/Capacitor_plague "Papcina" wrote in message ... hi people.. im interested in repairing computers motherboards.. mostly the older ones ( based around socket 370, socket A and lower) and have some questions... when there is a motherboard fried from a power surge, is it worth trying repairing? what components usually die in such situations? how to check all those SMD componentes and small ICs on easiest way to find out if they work or no? well, any info about such problems is needed... thanks in advance bye -- hr.rec.ronjenje °((( contact me: |
#4
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dead motherboards...
http://www.capacitorlab.com/index.htm
"Papcina" wrote in message ... hi people.. im interested in repairing computers motherboards.. mostly the older ones ( based around socket 370, socket A and lower) and have some questions... when there is a motherboard fried from a power surge, is it worth trying repairing? what components usually die in such situations? how to check all those SMD componentes and small ICs on easiest way to find out if they work or no? well, any info about such problems is needed... thanks in advance bye -- hr.rec.ronjenje °((( contact me: |
#5
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dead motherboards...
Bilo je to Sat, 19 May 2007 08:56:29 -0500, kada je poznati "w9gb"
napisao ove stvari: You will find that the economics of the repair parts and your time -- may not make sense. For your overall education (and a leading cause of many failures) http://www.badcaps.net/ http://en.wikipedia.org/wiki/Capacitor_plague yes ano about the capacitors... but what when a mobo gives no sign of being alive? the capacitors r fine, bios is reflashed and no visible sign of burnt stuff? how to find an error in that case? FETs works normally, every other bigger chip is wroking fine... any ideas where to check more? im sentimentaly affected to this mbo ) -- hr.rec.ronjenje °((( contact me: |
#6
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dead motherboards...
PeterD wrote in
: On Sat, 19 May 2007 12:02:38 +0200, Papcina wrote: hi people.. im interested in repairing computers motherboards.. mostly the older ones ( based around socket 370, socket A and lower) and have some questions... when there is a motherboard fried from a power surge, is it worth trying repairing? Never. There are zillions of these out there you can get for free, so why try to fix one? WHERE does one get these FREE motherboards? -- Jim Yanik jyanik at kua.net |
#7
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dead motherboards...
"Papcina" wrote in message
... Bilo je to Sat, 19 May 2007 08:56:29 -0500, kada je poznati "w9gb" napisao ove stvari: You will find that the economics of the repair parts and your time -- may not make sense. For your overall education (and a leading cause of many failures) http://www.badcaps.net/ http://en.wikipedia.org/wiki/Capacitor_plague yes ano about the capacitors... but what when a mobo gives no sign of being alive? the capacitors r fine, bios is reflashed and no visible sign of burnt stuff? how to find an error in that case? FETs works normally, every other bigger chip is wroking fine... any ideas where to check more? im sentimentaly affected to this mbo ) Most computer motherboards are 4 layer and many are 6 layer -- so problems may be present you can not see (but testing would --- takes time -- to find bad component,etc.) START with Power Bus and go from there. |
#8
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dead motherboards...
"Jim Yanik" wrote in message ... PeterD wrote in : On Sat, 19 May 2007 12:02:38 +0200, Papcina wrote: hi people.. im interested in repairing computers motherboards.. mostly the older ones ( based around socket 370, socket A and lower) and have some questions... when there is a motherboard fried from a power surge, is it worth trying repairing? Never. There are zillions of these out there you can get for free, so why try to fix one? WHERE does one get these FREE motherboards? For computers that old, check businesses that are doing tech refreshes. Many of them -pay- to have their computers hauled away. And many of the computers aren't that old. -- Jim Yanik jyanik at kua.net |
#9
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dead motherboards...
Papcina wrote:
yes ano about the capacitors... but what when a mobo gives no sign of being alive? the capacitors r fine, bios is reflashed and no visible sign of burnt stuff? how to find an error in that case? FETs works normally, every other bigger chip is wroking fine... any ideas where to check more? Check the RAM. Those old DIMM slots suffer frequently from bent pins. Also try another RAM stick (DIMMS must be in pairs). Then try to replace the CPU, supply and video card. |
#10
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dead motherboards...
You will find that the economics of repairing old mother boards does not
make sense. The devices are all surface mounted, and the troubleshooting and servicing requires extensive knowledge, sophisticated tools and sophisticated equipment. Then there will be the problem if finding the replacement parts. You are best off to look around for older computers and rebuild them. But, having older computers will be limited in their capability, especially with the newer operating systems and software's. This is why they are going to the landfills in the first place! I think you should seriously look for something that is more profitable. If fixing old computers was profitable, there would be many more companies doing it! -- Jerry G. "Papcina" wrote in message ... hi people.. im interested in repairing computers motherboards.. mostly the older ones ( based around socket 370, socket A and lower) and have some questions... when there is a motherboard fried from a power surge, is it worth trying repairing? what components usually die in such situations? how to check all those SMD componentes and small ICs on easiest way to find out if they work or no? well, any info about such problems is needed... thanks in advance bye -- hr.rec.ronjenje °((( contact me: |
#11
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dead motherboards...
Bilo je to Sat, 19 May 2007 15:53:44 -0400, kada je poznati "Jerry G."
napisao ove stvari: You will find that the economics of repairing old mother boards does not make sense. The devices are all surface mounted, and the troubleshooting and servicing requires extensive knowledge, sophisticated tools and sophisticated equipment. Then there will be the problem if finding the replacement parts. You are best off to look around for older computers and rebuild them. But, having older computers will be limited in their capability, especially with the newer operating systems and software's. This is why they are going to the landfills in the first place! I think you should seriously look for something that is more profitable. If fixing old computers was profitable, there would be many more companies doing it! xD lol... well in fact i dont want to get in bussines with nothing, its just i have some old motherboards with no sign of life, which i would like to repair... and a wonderful cubx mbo ) thx for answers bb -- hr.rec.ronjenje °((( contact me: |
#12
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dead motherboards...
On 19 May 2007 16:57:24 GMT, Jim Yanik wrote:
PeterD wrote in : On Sat, 19 May 2007 12:02:38 +0200, Papcina wrote: hi people.. im interested in repairing computers motherboards.. mostly the older ones ( based around socket 370, socket A and lower) and have some questions... when there is a motherboard fried from a power surge, is it worth trying repairing? Never. There are zillions of these out there you can get for free, so why try to fix one? WHERE does one get these FREE motherboards? MOst any independent computer repair shop will do. THey frequently have to pay to dispose of them, and are glad to give them away. Many are the result of upgrades. The local shop generates a couple of them a week, sometimes more. THey usualy have a pile of 20 or so in the scrap pile at any time. |
#13
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dead motherboards...
On Sat, 19 May 2007 16:30:09 +0200, Papcina
wrote: yes ano about the capacitors... but what when a mobo gives no sign of being alive? the capacitors r fine, bios is reflashed and no visible sign of burnt stuff? how to find an error in that case? FETs works normally, every other bigger chip is wroking fine... any ideas where to check more? im sentimentaly affected to this mbo ) I've fixed a lot of dead motherboards by removing the CMOS battery for a day or two. This has worked several times, even when the clear CMOS jumper didn't help. Andy Cuffe |
#14
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dead motherboards...
Bilo je to Sat, 19 May 2007 19:08:33 -0400, kada je poznati PeterD
napisao ove stvari: MOst any independent computer repair shop will do. THey frequently have to pay to dispose of them, and are glad to give them away. Many are the result of upgrades. The local shop generates a couple of them a week, sometimes more. THey usualy have a pile of 20 or so in the scrap pile at any time. it could be, but not in all countries over the world -- hr.rec.ronjenje °((( contact me: |
#15
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dead motherboards...
"Andy Cuffe" wrote in message
... On Sat, 19 May 2007 16:30:09 +0200, Papcina wrote: yes ano about the capacitors... but what when a mobo gives no sign of being alive? the capacitors r fine, bios is reflashed and no visible sign of burnt stuff? how to find an error in that case? FETs works normally, every other bigger chip is wroking fine... any ideas where to check more? im sentimentaly affected to this mbo ) I've fixed a lot of dead motherboards by removing the CMOS battery for a day or two. This has worked several times, even when the clear CMOS jumper didn't help. Andy Cuffe If a motherboard is showing no signs of life, how can you say that every other bigger chip is working fine? If the board is dead, meaning that it won't boot up, or even run POST tests, then how are you checking the "bigger chips? You can't assume anything in this case... everything has to be verified conclusively. The only way that I can think of doing that in the case of a dead motherboard is to unsolder the chips and put them on a known good board. Given the lack of service information on any of the PC boards that have been produced in the past 25 years, it's shooting in the dark. -- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Life is like a roll of toilet paper; the closer to the end, the faster it goes. |
#16
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dead motherboards...
"Jim Yanik" wrote in message ... PeterD wrote in : On Sat, 19 May 2007 12:02:38 +0200, Papcina wrote: hi people.. im interested in repairing computers motherboards.. mostly the older ones ( based around socket 370, socket A and lower) and have some questions... when there is a motherboard fried from a power surge, is it worth trying repairing? Never. There are zillions of these out there you can get for free, so why try to fix one? WHERE does one get these FREE motherboards? -- I gave away a pile of them on Craigslist, I probably have some more laying around I need to dump off on there. |
#17
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dead motherboards...
On Sun, 20 May 2007 16:51:37 -0400, "DaveM"
wrote: If a motherboard is showing no signs of life, how can you say that every other bigger chip is working fine? If the board is dead, meaning that it won't boot up, or even run POST tests, then how are you checking the "bigger chips? You can't assume anything in this case... everything has to be verified conclusively. The only way that I can think of doing that in the case of a dead motherboard is to unsolder the chips and put them on a known good board. Given the lack of service information on any of the PC boards that have been produced in the past 25 years, it's shooting in the dark. There's no way to know. Fortunately, the big chips are very reliable. They don't normally fail unless something really bad happened (like excessive voltage from a bad power supply, or someone shorting something out). Testing the chips is completely impractical. The soldering equipment alone would cost thousands. The way to trouble shoot a motherboard is to eliminate the few things you can fix before scrapping the board. Once you eliminate the simple stuff, it doesn't really matter whether it's a bad chipset chip, bad internal connection on the board, or some other unfixable problem. I've repaired a lot of boards by replacing exploded caps. I've also replaced melted ATX power connectors. On one board, I even replaced some bad voltage regulator transistors (they were over heated because of bad caps). If you know the board suffered from a failed BIOS flash, you can reprogram the flash chip (it helps if it's in a socket). Andy Cuffe |
#18
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dead motherboards...
Papcina wrote in
: it could be, but not in all countries over the world Around here, it is not worth upgrading the innards of older computes, as they don't meet modern power and cooling requiremnts, and the cases don't "match" modern fashions, so old PCs are thrown out whole, and new ones bought. |
#19
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dead motherboards...
Gary Tait wrote:
Around here, it is not worth upgrading the innards of older computes, --- as they don't meet modern power and cooling requiremnts, and --- the cases don't "match" modern fashions, so old PCs are thrown out whole, and new ones bought. If we are asked, in the year 2525, what we did with all energy, then we can gladly answer: We built things and dumped them. (SCNR) Regards, H. |
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