MOTHERBOARD REPAIR

Motherboard Repair

I had stopped repairing PC motherboard  since i left my former computer distributor company back in 1994. Those days the famous motherboard board were the 486sx, 486dx and the Pentium. I was provided with every model of the motherboard schematic diagrams,  Chipset (all range of IC’s), SMD desoldering tools, troubleshooting notes and even the POST diagnostic card. Repairing PC motherboards on those days were quite easy but i doubt nowadays it will be easy unless you are working in the motherboard manufacturers or you have the sources for all kind infmotherboard. 

Occasionally i do have motherboard sent for repair by my friend who deal with selling computer systems. Most of the time was the electrolytic capacitors bulged and quite simple to fix it. Nowadays PC motherboard is quite cheap and less people want to repair it and prefer to buy a new board unless if the motherboard is in the higher range (branded). As mentioned, if you can’t source for the parts it would be very difficult to repair the board. Those days the boards were only using normal SMD IC’s (spider IC’s) but most of the motherboard now are using the BGA IC’s which is very difficult to extract unless you have the special equipment to do the job.

It will be very time consuming to do this precision job unless the profit that you gonna make could cover your cost otherwise it would not be economical to repair the motherboard. If any of the readers in my blog repair motherboard i would like to listen to what you have to say about motherboard repairing business-thanks

Troubleshooting Motherboard problems

Troubleshooting Motherboardtechniques

You will find moremotherboardTroubleshooting techniques in theSelf Computer Repair Unleashed! Manual(view asample of the manual).

Troubleshooting Motherboardproblems is like trouble shooting your car when it won't start. Is the battery dead, is it out of gas, is the spark getting to the spark plugs. See where I am going with this. Your problem could be any where from the power cord plugged into the wall socket all the way to the keyboard.

When you have a problem and have ruled out all the external devices [mouse, keyboard, commercial power, and monitor] then you start on the internal devices, hard drive, cd rom, floppy, video card, any installed auxiliary cards like the sound card, NIC, power supply, and so forth.

One indication that yourmotherboardis experiencing problems is when you power it up and goes straight into the BIOS setup. Some times you will get an error message about why it went into the BIOS setup, some times nothing but the setup screen. Another indication is with the newer motherboard one of the embedded devices has failed, you can press on and install a card to replace that device or if under warranty send it back to the manufacture for repair or replacement.

So what is your motherboard doing that is out of the ordinary?

• Not starting at all?
• Dumps to BIOS setup?
• Can't see the hard drive or cd rom?
• Mouse not working or intermittent? Keyboard not functioning?
• No sound from the embedded sound device?
• No network connectivity from the embedded NIC?
• Your USB will not connect on one or more ports?

Well let's see if you can fix that problem.

Before we run down the list did you get a POST error or beep code? If you did then go to the manufactures web site and look it up, this will be faster than trying to find the solution through this check list.

Question: Have you changed anything in the BIOS? Added any new cards? Removed any cards? Added memory? Upgrades of any kind?

If you have changed any thing from theBIOSto adding or removing cards then the problem is not your motherboard!

If you have not changed any thing then we know that the problem has something to do with hardware, let's assume that the power supply, mouse, keyboard, and video is good.

First go into BIOS, check the time and date [yup this is an indicator] if it has reverted to the default time [any time other than the current date and time will be the default]then your internal battery has diedand needs to be replaced. You can set the time and date and reset all the BIOS settings but when you power the system down you will lose those settings and have to do it again when you power it back up. [This is assuming you have your computer connected to a power strip with surge protections and power everything down while not in use!]

If the BIOS settings are correct then we need to look at your problem.

Observe ESD! 

Troubleshooting Motherboardinstructions:

Normal trouble shooting is to reseat all cable connections including power connectors, memory, cards, and the processor [use care while removing and reseating the processor!].

Problem still persisting?

If reseating everything did not cure your problem next disconnect all cables from your mother board, remove any cards with the exception of the video card, leave the power to the motherboard, the memory, and the processor. Did the problem go away?

Let's assume that your problems is not an embedded device [sound, nic, video, or usb] and it persists once you have the board stripped down to minimum support devices [mouse, keyboard, video card, and memory].

You are down to four possibilities:

• The processor is failing [over heated and intermittent].


• A memory module has failed.


• Something on the motherboard has burnt and is shorting out.


• A auxiliary wire [power led, hard drive activity led, reset button, or soft power button] has shorted out.

After checking the memory [if you have two or more memory modules try removing one if that doesn't swap them out] and the aux wires and the problem persists  you will need a magnifying glass to look at all the ic's and wire traces on the motherboard looking for burnt areas or ic's.