Dead P4P800 Desktop Repair
Often when I want to check if my USB bootable memory sticks work I test them on my older P4P800 desktop computer. This way avoiding the risk in damaging the bootsystem on my newer computers. But this time my old trusted Asus computer refused to start up. And nothing worked, not even the Num lock led on the keyboard. Which always is a good indicator.
After a quick look on the component side of the mainboard I immediately noticed one larger bulged e-cap. Here marked in the photo with the purple arrow. Removing it was easy with using my Ersa MS6000 solder station by melting the solder on the solder side and at the same time carefully bit by bit pulling the legs of the e-cap out the very narrow tin filled holes.
As in these cases it is impossible to do it any better other ways. This way keeping tracks and through hole via’s intact. It was a 1500uF 6.3V e-cap. These are mostly special low ESR type of capacitors. Below the now removed bad e-cap.
I tried to open the holes after the e-cap was removed to make it free for a new capacitor but it was very hard and I probably could have done it by using my hot air gun to provide heat on the component side and at the same time suck out the tin on the solder side. But there was no need to risk damaging the tracks or the mainboard because 2 of those small 1000uF 6.3V e-caps in parallel would easily fit under the mainboard on the solder side without sticking out too far at all.
Previous photo now shows the open spot where previously the bulged e-cap was soldered.
And above photo shows the new mounted e-caps that also were glued to each other and to the solder side to give them some extra mechanical strength and some extra electrical insulation.
They were very small and really did easily fit under the mainboard even without ever touching the metal outside plate. And I had enough of those in stock for future Mainboard repairs. But of course I first checked if my Asus P4P800 desktop booted again and it worked like a new computer again!
This Rev.2.0 mainboard may be rather old now but it is still a perfectly good computer to copy a cd or dvd, read a memory stick or to test the boot system of any media. And it has a perfect speed controllable Zalman cooler fan, IDE ports, and 2 Sata ports. And a good old 3.5 inch floppy drive and a card reader. With a removable harddisk in bracket plus selectable system boot harddisks. Furthermore it has a special Nvidia card with remote media controller to play videos with it.
And after both new e-caps were added everything worked again like it always did! Next photo shows one of both boot systems.
Albert van Bemmelen, Weert, The Netherlands
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Note: You can read his previous repair article in the below link: