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motherboard troubleshooting

By zekeallmon ·
I am servicing this customers Mobo, which has come in for modem/front usb port problems. He cant get his usb ports to work, and modem wont dial out. I quickly fixed the modem problem, and noticed that this persons usb jumpers on the board were setto disable, so I enabled them. But they still wouldnt recognize. So, I was fooling with the wiring on the board, that the usb ports hook up to.. when all of the sudden NO POWER!!!

Nothing will come on, I did everything, and it was dead. I have no Idea what happened. I was wearing my esd bracelet the whole time.

So, I order a new MOBO, and get the new one in. I have another tech by my side, as I put in the new MoBo. We go to power it up, and it wont even finish post before it gives alow, low groggy beep, and dies out. The wierd thing is that a split second before it beeps the power fan's rpm's go up slightly then it dies. Does anybody have any ideas??
I am going to RMA the Mobo on Monday if I have to. I have switched out the Power Supply, processor, DDR Ram, everything, to no avail. The switches on the board have all been checked... Im lost..

Thank you...
Zeke

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motherboard troubleshooting

by dmiles In reply to motherboard troubleshooti ...

Inspect all the Power cords to insure they are okay,then sceck that power supply switch voltage is set correctly

Also check the surge protector to make sure it is not causing problem

Check the CPU,to see if it is operating properly,check for overheating and possible damage from the surge

Check the mounting of the motherboard to the case,so that it is not gounding to case

Have you checked the power switch and made sure that it is not causing the problem.

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motherboard troubleshooting

by zekeallmon In reply to motherboard troubleshooti ...

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motherboard troubleshooting

by kmdigit In reply to motherboard troubleshooti ...

Just a Hint,not Sure
As it gets on for Split of second and goes of,
means there is short circuit in the system so it gets auto trip(Possibilities -SMPS/Motherboard
It would have help u more if u had specified the Mobo or configuration of system

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motherboard troubleshooting

by zekeallmon In reply to motherboard troubleshooti ...

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motherboard troubleshooting

by OTL In reply to motherboard troubleshooti ...

I agree with answer # 1 except replace the power cord, a breakdown in the wire insulation may not be visable on an inspection of the sheath. Also a broken/shorting conductor would only be found by ohming the cable and flexing it at the same time.Sounds like input power to the computer, not necessairly a problem with the computer, with all that has been changed out.

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motherboard troubleshooting

by zekeallmon In reply to motherboard troubleshooti ...

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motherboard troubleshooting

by Digital_DNA In reply to motherboard troubleshooti ...

Zeke,

I was just going through some of the old posts at Techrepublic and happened across your post "motherboard troubleshooting". I'm kind of curious as to whether you resolved you problem or not. If so, what was the problem? If not I have another suggestion or rather information regarding what your problem may be.

Some computer manufacturers don't use industry standard parts. For example, DELL uses custom built motherboards and power supplies. When replacing a motherboard or power supply on a dell computer, you must replace the motherboard and power supply at the same time - unless you get the replacement part direct from dell. If you try to replace one of these parts (motherboard or power supply) with an industry standard motherboard or power supply, you will fry the motherboard and/or power (possibly other parts as well).

When installing a new power supply from dell, or any other computer manufacturer for that matter, pay close attention to the cabling for the old and new power supply. On DELL powersupplys, there is a 12 volt power wire (yellow) where on an industry standard power supply there is a Ground wire (black). Plugging this power supply into a dell motherboard will supply 12 volts of power to a ground pin on the motherboard. As you can imagine that is very bad. Same applies to the motherboard. As a rule, you should replace both the motherboard and power supply at the same time, or get your replacement part direct from the computer manufacture.

ebcdic

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motherboard troubleshooting

by zekeallmon In reply to motherboard troubleshooti ...

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motherboard troubleshooting

by zekeallmon In reply to motherboard troubleshooti ...

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