Computer Won't boot? Check the Capacitors!

Something small & noticeable by many can cause you some problems

http://www.ubunite.com

Category:

Science & Technology

Tags:

• cpu
• motherboard
• Capacitors
• electronics
• booting up

[axel1973w]

WTF?!?! Soldering out Capacitors from a modern multi layer PCB ??!? u kidding? When did You tried this yourself the last time on a PCB like that ? Thats pretty much waste of time!!! the chance of damaging your board is even better than to successfully replace those caps and have the board run again. the chance to repair it like that is nearly ZERO. N what r u talking about electrical storrm? usualy the power supply will filter out those and gets damaged instead of the mainboard.

[ubunite]

@axel1973w I've serviced from my store a few "oops" with some timing relays on the boards before. yes it's possible to fix them. The PSU given a direct hit won't save yourself. Brownouts more often here though. Summer storm season was the best times to stock up on power supplies. My shop was busy. :)

[axel1973w]

@ubunite OF COURSE you are never protected if receiving a direct lightning hit (even indirect). Of course brownouts cannot be filled by a simple PSU. pls stay to the topic! if hit by a lightning a replacement of the capacitors wont help you anymore. and simple brownouts wont harm the capacitors. in your video you said: if your puter does not boot check/replace the caps. and i say....thats no good advice since the chance for a success repair is practically zero. not even PCM makers do this.

[ubunite]

@axel1973w yea, it;s a crapshot trying it.

[firebomber39]

@Slaterking2010 If we're here, we probably know what a capacitor is. But thanks, that gives a simple explanation to my class what a capacitor is.

[UnivegaSuperSport]

@axel1973w Looks like you have a bad grammar capacitor and a blown spelling resistor.

[sylontuk]

@binoers That is what I am experiencing right now with a Dell Optiplex GX620 I have come across this capacitor problem many times in my search to fix the problem online, but on checking the capacitors they seem ok..

The other thing I have noticed people saying is the USB on the front and the cards that they are attached to..

I think I'm just gonna end up saving up for a new PC to be honest...

[PikusAlbtech]

@binoers

Is there a beep sound (or few beeps) when you connect the 4pin you are talking about ?

or no beeps at all ?

What type of motherboard is it ?

I think you should give some more info.

I have came across some intel motherboards & those go bad very easily.

Not worth to spend time& money on that type.

[Slaterking2010]

All capacitors are two flat pieces of metal, where one hold more electrons then the other, make the capacitor have a high potential difference (Voltage). To make them practical, there is a special insulating substance between the metal and they rolled it up in the shape you see as the capacitor.

[binoers]

Sir!, can u help me, when I connect 4 pins near the processor, after I switch power on, the fan will run after a few seconds, it automatically turned off,... do I have some bad capacitors or do you have any Idea where on the motherboard should be replaced,... if i don not connect the 4 pins, the fan on the procie works, but no display,... I hope you have any suggestions.... thanks.

[gbenifits1968]

lol..throw it in the garbage!! wasting time fixing that shit!!!

[PcTestCardCom]

I agreed capacitor may cause a lot of problem as well as no boot.

There are 3 major stages PC will do when we press the power button:

1. Power On, 2 POST-show PC logo 3. boot to the Winodws

if there is anything wrong with the capacitor, we probably won't see the 2nd stage POST with PC mainboard logo screen.

boot is the process that HDD take a lot of workload, so i will check the HDD and the HDD controller first.

[rhblakeman]

Also the ones in the vicinity of the CPU are part of the voltage regulator module to regulate CPU voltages which is why the CPU sits there going "duh". Either power is out of spec or none at all.