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Join Date: Mar 2008
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Newbie Poster
Wow, Trionztek, thank you very much for your kind response. This is exactly the type of information I've been looking for. I haven't reviewed all the information in your post yet, but I've printed it out and will save it for the next time I again feel the urge to venture into a board level repair. I'll continue to use this thread as a reference also. I've found amazingly little information regarding this type of work at the library and on the internet, so it's much appreciated. As another poster stated, there are areas of the world where it still makes more sense to repair instead of replace, and in certain situations also. I'm very busy right now but I just wanted to add this reply. Thanks again.
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Join Date: Jun 2008
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@cart0181,
You are most welcome. Do keep in mind to always use step by step troubleshooting and always use common sense.
The ICs that give clock pulses to drive the Mosfets can and do fail. To test these you need the pinouts and an oscilloscope.
In general faults like a keyboard not working, you need to check if there are any open fuses or inductors. These can be replaced by a wire if needed in case a replacement isn't available. Do check if power is available to the keyboard. Most pinouts are on the net.
In case all fuses and inductors are fine then its the I/O chip that can be faulty. These can and do fail and generally this is the problem when several I/O ports like keyboard, mouse, USB all fail at once. IN case of serial port failures, the RS232 controller IC can fail. Replacing it generally solves the prob, if not its the I/O IC that's controlling the RS232 IC. Do check supplies to all ICs before jumping to conclusions.
Board repair can be useful in cases when its not possible to easily replace the system.
If you take some time to learn to repair boards, the skills can be used to fix almost any modern digital equipment- XBOX360s, IPods, Laptops, mobile phones, Arcade games, simulators, CAT-scan machines, etc... And the bigger the equipment, the bigger the bucks.
Good techs who can fix things will always have avenues to make good money. You just have to be flexible to keep updating your knowledge and never fixing something thats broken.
Live long and prosper!
You are most welcome. Do keep in mind to always use step by step troubleshooting and always use common sense.
The ICs that give clock pulses to drive the Mosfets can and do fail. To test these you need the pinouts and an oscilloscope.
In general faults like a keyboard not working, you need to check if there are any open fuses or inductors. These can be replaced by a wire if needed in case a replacement isn't available. Do check if power is available to the keyboard. Most pinouts are on the net.
In case all fuses and inductors are fine then its the I/O chip that can be faulty. These can and do fail and generally this is the problem when several I/O ports like keyboard, mouse, USB all fail at once. IN case of serial port failures, the RS232 controller IC can fail. Replacing it generally solves the prob, if not its the I/O IC that's controlling the RS232 IC. Do check supplies to all ICs before jumping to conclusions.
Board repair can be useful in cases when its not possible to easily replace the system.
If you take some time to learn to repair boards, the skills can be used to fix almost any modern digital equipment- XBOX360s, IPods, Laptops, mobile phones, Arcade games, simulators, CAT-scan machines, etc... And the bigger the equipment, the bigger the bucks.
Good techs who can fix things will always have avenues to make good money. You just have to be flexible to keep updating your knowledge and never fixing something thats broken.
Live long and prosper!
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