Dead Motherboard? (Gigabyte GA-MA785GPM-US2H)

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Z

ZCheetahZ

Honorable
Oct 23, 2013
8
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10,510
I just tried to turn on the PC today and the only thing I saw for a second or so is that RED light of the POWER switch. After that, nothing.
I opened it up and replaced the PSU with another one which works, same thing! the fan inside the PSU moves a bit and stops right away. (both PSU demonstrated the same problem).
How can I be sure that the MOBO is dead? maybe it's the CPU? or even both?
I tried turning it on without connecting any component inside the case, same outcome.
oh, and another thing worth mentioning, there's no power indicating LED on this mobo.

Specs:
Gigabyte GA-MA785GPM-US2H
AMD Athlon II X2 250 3GHz AM3
Corsair 2X1GB 800MHz DDR2 CL4
PSU 300W and also tried another one of 350W which is operational

UPDATE TO PROBLEM:
I checked the PSU - it's OK.
I disconnected the 4 PIN power cable and the PSU suddenly works - But the CPU Fan is struggling to rotate.
Can I now be sure that there's a problem with the motherboard?
 
Solution
lonewolf7
I don't think the CPU is dead, cause CPU's are hard nut to crack, all I mean is they are durable wont fail that easy. So its best for you to buy a MB, its cheap to try, OR find a local service centre to isolate the problem.

Another thing, it could be the PSU's are ok, but they have not enough power to run the components, it happens frequently, I see it regularly.
So when you turn it on without any components attached to it, it will spin, but when in load it will not spin. So I can suggest you to get a more powerful PSU from someone and test with it. See what happens. Good luck.
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lonewolf7

lonewolf7

Splendid
May 6, 2013
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I don't think the CPU is dead, cause CPU's are hard nut to crack, all I mean is they are durable wont fail that easy. So its best for you to buy a MB, its cheap to try, OR find a local service centre to isolate the problem.

Another thing, it could be the PSU's are ok, but they have not enough power to run the components, it happens frequently, I see it regularly.
So when you turn it on without any components attached to it, it will spin, but when in load it will not spin. So I can suggest you to get a more powerful PSU from someone and test with it. See what happens. Good luck.
 
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Solution
Z

ZCheetahZ

Honorable
Oct 23, 2013
8
0
10,510
Actually I tested the PSU with a multimeter and the "paper clip" for voltage on the 5V (got ~5.2V) and for 12V (got ~12.4V), and also tried another PSU (more powerful) which didn't do anything (unless I disconnect the 4 pin Power plug - then only the cpu fan and the PSU are working - no POST or beeps).
I also noticed that the CPU FAN plug (on the mobo) is having trouble giving the proper amount of juice. But if I connect it to the CASE FAN plug it runs OK. So maybe this MB had problems from the start and I just haven't noticed it till it was too late.

By the way, Does the 4 pin power plug give juice to the CPU? because when i'm not connecting it the CPU doesn't get hot at all.
Remember, I only get response from the system while the 4PIN power is Disconnected. If I connect it - all is dead, even the PSU.
 
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carlo_bigtunes

carlo_bigtunes

Honorable
Nov 18, 2013
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10,960
hi there i. from indonesia...sory for my bad english
yes my friend u'r motherboard has a short part...like if u plugin 4pin into motherboard there's cpu fan only spin for a 1-2s then mobo off...right?but if 4pin unplug u'r motherboard work normally but u can't shutdown from power button ...right?

if it so your motherboard have a bad MOSFET there..or a short mosfet 12v to ground, that make dea MB...
u can check it with digital multimetee buzzer
- black probe multimeter plug in to 4pin groung (black cable)
- red probe , touch it to to 1 mosfet alternately ( source first then drain) if there only 1 beep that mosfet normally
if 2 leg mosfet beep there u are the bad mosfet,,u must replace it, and your MB work again...


 
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Z

ZCheetahZ

Honorable
Oct 23, 2013
8
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10,510
emmm, are you sure that those giving two beeps are the faulty ones? or only one beep is faulty?
I checked it, and almost every MOFSET around the 4PIN power beeps on two legs. with the exception of two MOFSETs:
one is near the mini power plug for the CPU FAN, the other is closer to the FSB cooler fins.
 
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Z

ZCheetahZ

Honorable
Oct 23, 2013
8
0
10,510
Hi again guys, I tested the CPU on another motherboard but got no display. Although the CPU got a little hot this time. So now I believe that the CPU died along with the motherboard..
 
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Z

ZCheetahZ

Honorable
Oct 23, 2013
8
0
10,510
I don't know about this.. I could end up spending these 80 bucks on the motherboard and then another 80 for a cpu.. this is already too expansive for a "fix".
at twice the price (~320$) I can replace the whole system for a new core i3 4130 with a new motherboard and 4gb of DDR3 RAM.
Thank god I didn't order that motherboard yet...
Anyway, I will try to find another AMD setup to test this CPU before going on with it.
 
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