View Single Post
Old 05-01-2005, 07:47 AM   #11
Super Modulator
willawake's Avatar
Join Date: Nov 2003
City & State: Αθήνα
Posts: 8,006

10. [ Check the board more and then you can apply power to it ]

10.1. Check the board against the diagram you made : see that ALL the capacitors you have installed are the correct values and are installed in the right direction before you apply power to it. Check again that you did NOT install caps in positions where there were not before.

10.2 Apply power to the board : connect processor/ram/keyboard/floppy disk and monitor, then power up the board. It is useful to have cpus and ram which are for testing only so you do not fry customers or friends parts if you made a mistake.

10.3 If it does not POST : Don't jump to the conclusion that you screwed the board on the basis of the boards leds which show a post error or if you do not get a video signal. Stay calm and check your monitor connections, ram seating, cpu seating before you decide you made a soldering mistake. Check the manual for the board leds to see what is the problem. I guarantee that if you were reasonably careful you will get a boot. The boards can take some soldering abuse. If you burnt or scratched some board traces while you were working or have a short that is another thing though. Sometimes clearing the bios using the jumper or taking the battery out can solve problems.

damaged traces from excessive heating. not good shots because those are after attempted repair but you get the idea.

10.4 Run test utilities
: first I would start off booting a ram test utility disk like or DocMemory from and checking for ram errors for a few hours while using known GOOD ram, then you can run some burn in utilities like prime95 or sandra from also in Windows and you would want to see the board totally stable with no errors after running them for some days. At least run the board overnight if you are in a hurry.

10.5 Good luck with your new board.
: DIY will make you very happy and you may go on to some other soldering task such as making a stereo amp kit or something. A worthwhile way to pass the weekend and very rewarding. If you progress to doing nice looking cap replacements then you can start doing your friends' boards as well and make some money. If you can do this work then you have nothing to worry about, many component failures are due to bad caps. You could even progress to buying stuff with bad caps for cheap and repairing it yourself. At least you will never worry about buying components with cheap caps again, you will be able to restore them to longevity yourself.

11. Where can i get more info about repairing and testing electronics?
Attached Images
File Type: jpg trace2.jpg (82.5 KB, 5370 views)
File Type: jpg trace.jpg (101.4 KB, 5331 views)

Last edited by willawake; 06-04-2006 at 03:14 PM..
willawake is offline   Reply With Quote