Question about Dell Computer Refurbished OPTIPLEX SX270 SYSTEM BOARD Computer Motherboard

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Blown dell motherboard

When a motherboard blows and theres no power and it looks dead what is the first component you would check because id like to really try to get this machine running again cheers map9966

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Have you checked to make sure it wasn't the power supply? If this motherboard is still inside the pc and the cd/dvd lights up, or the network card shows life, fans, case lights, etc: than I would rule bad mobo. If nothing shows signs of life, try power supply or even better maybe a lose connection.Check all cabling and wire plugs. Clean out any dust.

Posted on Jan 10, 2009

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Dell xps 435


check if the power cord is correctly attached and current is available.
If you then hit the power button and nothing happens, this means the power supply is down. This compenent can be sold in any local specialized computer dealer.

It looks like this: http://www.bestbuy.com/site/Computer-Cards-Components/Computer-Power-Supplies/abcat0507009.c?id=abcat0507009

Jul 16, 2012 | Intel Computers & Internet

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My epson 340 has no power


You have to disassemble the printer and check the power supply. Make sure that the fusehas not blown or some other component is damaged. If there are damaged components,to remedy these switching power supply components.
If the power supply is working perfectly, Check all the connections of the logic board andpanel board looking for damaged cables.

Apr 10, 2012 | Epson Office Equipment & Supplies

1 Answer

Is there any fuse inside the KH624 power supply?


Typically, there are no fuses inside these devices. You'd think that there should be - but it's not the case. Most of the time, power supply units (PSU) begin to overheat and ever so slowly die. Replacement PSU have dropped in price - like everything else. Your best bet is to replace it and maintain it from here on in to ensure a long life.

PSU's overheat and fail because of dust. Lots of it. The fan inside blows air into the PSU case to help keep the component cool. Unfortunately, dust gets blown in at the same time - and slowly builds up on all surfaces and components. The dust build up acts as a thermal insulator that prevents the air from removing the heat. A PC on the floor will have a great deal more dust build up inside than if it were on a desk top. Oh, and the fans in the PC (not just the PSU) blow dust all over the motherboard components and expansion cards inside it, too. The most expensive components are the CPU and video card(s).

Move the PC to the desk and regularly clean the components that have fans on or near them ideally with a vacuum or if unable to vacuum - blow out with compressed air to keep them running reliably.

Nov 26, 2011 | Dell L375P00 (KH624) 375Watt Power Supply

2 Answers

Just had a thunderstorm last night. My Dell Inspiron 700m was connected to a Triplett Power Strip. Other devices connected to the power strip seem to be working. When I put the power supply plug in the...


Hi
Normally the AC adaptor gets fried, the fuse inside the plug that goes into the mains normally blows. If you are getting power to the laptop in some form, you should first of all check the adapter.

Plug this into the mains and, with a multimeter set to 20 volts DC place the red probe onto the inner jack pin, and the black probe to the outer part of the jack, see if the voltage reading is 20 volts, give or take a volt. ONLY do this if you have first inspected the charger, check for any burning smell or melting of the case or wires (to be safe).

If the voltage is correct, (remember that dell laptops will only charge with genuine Dell chargers), the charger may be powering the laptop but NOT charging it..If you can, try and obtain another Dell charger to eliminate the charger being at fault.

Now remove the battery, press and hod the power button for 30 seconds and try it on ac power alone, a fried battery will sometimes stop the laptop from booting, if it DOES boot, the battery has been damaged (possibly the battery charge circuit too).

If it does NOT boot, the problem lies on the motherboard. There is, near the charger port on the motherboard a small ceramic fuse of about 3mm length with metal caps. This may look intact but if again, you apply a multimeter set to 10 Ohms across the terminals of the fuse and do not get a reading, the fuse is dead and will need replaced. I normally bridge the fuse connections with a soldered wire of 3 amps but this is NOT a recommended fix long term

If the laptop still does not boot, there is a resistor or possibly a capacitor blown, remove the motherboard fully and check , you will see a blown resistor as it will appear charred and blackened, whilst capacitors tend to burst at the top (usually).

In this case, it is probably not worth the cost of fixing.

If the laptop does boot, but does not charge even with a new charger, look at the motherboard again, near the battery I THINK there is a similar ceramic fuse for the battery charging circuit, check this also

Jul 28, 2011 | Dell Inspiron 700M Notebook

1 Answer

Cpu fan works, power supply fan works why wont' computer come on?


Could be a number of reasons:
The CPu fan and the PSU fans will come on, even though the system is not working. There is a possibility that the CPU has blown, you can check this easily by (carefully) feeling the heatsink after it has been running a while. A dead CPU will not use power and therefore not heat up. If after say 10 minutes of running, the heatsink is clay cold, suspect the CPU. Replace with another one, spreading CPU grease on the top before putting the heatsink back on.

A blown CPU will usually be indicated bu there being NO beeps from the system (see below)

If the CPU appears to be generating heat, visually inspect the board, look for blown or blowing capacitors (the small cylinder like components) on the motherboard, any that are bulging or leaking a brown residue, or have blown, will render the motherboard inoperative.

If these appear ok (they still may be damaged), unplug all components except the hard drive, and ram and video card, see if the system then boots. If it does, proceed to re-installation of each in turn, until the faulty peripheral halts the boot.

Listen for any beeps as the ssytem switches on these beeps describe the type of problem
(repost if you hear any beeps)

Remove one stick of ram and try rebooting, if it works, suspect the ram module, try the other and see if that makes any difference.

Failing that, your last recourse is to power the system off, remove the bios battery, replace after 2 minutes and see if clearing the Cmos "unsticks" the computer.

After That, suspect the motherboard is dead.

Apr 25, 2011 | Computers & Internet

1 Answer

I have a 2005 del optiplex gx280 my power is tl dead no lights at all is this the mother board ?


Open case and look at capacitors around the processor, ( round metal looking components standing
up) if the look like the tops have popped open they are bad...this is a common problem with these
systems from dell

Feb 05, 2011 | Dell Optiplex GX280 (99301) Motherboard

1 Answer

The picture does not come on when I turn it on.


Hello

Your TV is now in dead condition I should say. You should strart from its power supply regulation section itsef to rectify the fault. Look into the fuse, a glass fuse is there, in power supply board. If It has found blown, make sure that there is something short in either power supply regulator side, of on the other part of the printed circuit board.
You just place a fuse of same rating as used, if the fuse is blown. If the fule you installed newly also blows off, check first the retifier stalk for any leak. The stalk contains four diodes, even any one of them gets shorte, fule will blow up. If there is no leak in the retifier stalk, measure the voltage resistance across the main filter capacitor, a bulky one capacitor fitted in the power regulator section. If you see a full deflection on meter, it means that there is some dead short inside the power regualtor system.
Usually Sony uses STR regulated type power supplies, and some uses MOSFET [Metal Oxide Semiconductor Field Effect Transistors], as switching elements. Bothe of these types can be shorted, due to a high voltage spikes, or a sudden supply failure and restart.
Check out short test on these components, out of board, that is, desolder it out from the circuit board. You just resolder one by one and measure the resistance ad described above. Thus you can find out the exact component, that have a short. If any of these components shorted, check the entire power regulator section for any more component failure, like zener diode short, resistors opened, and so on. You should have a concept of soldering and a little knoledge in electronics. There will be a MOV [Metal Oxide Varistor] fitted across the power supply input, which look like a disc capacitor. it will get shorted when a certain voltage spike occures abvve its rated voltage, and apply a dead short at the supply stage. If any of them used, desolder it out and check for any leak, and is found leaky, replace it. It is used as a saftey measure, and without it the set will work fine.
Just check these and if you find any difficulty, contact me through Fixya. Ok.

Nov 29, 2010 | Sony KV-36XBR450 36" TV

1 Answer

I have a Dell Latitude D510 with the input power circuitry has blown components. I am trying to locate a schematic Diagram of this section. I need to find the values of several components.


In this regard if there are circuits blown from the laptop of motherboard, my best advise is have the motherboard replace or call DELL technical support for assistance to have same model of the motherboard that your laptop had. Thank you.

Oct 12, 2009 | Dell Latitude D510 Notebook

1 Answer

Dell Dimension 9200 PC will not power on


Well, either way it sounds like something in your motherboard or your system got fried. Either a surge occurred frying some if not all components (yes, voltage can still flow through them even when they're dead allowing things such as the LED on the motherboard to glow) within the computer, or your PSU blew out taking some components with it.

Due to what you're describing, I'm more inclined to believe your PSU blew out due to some form of an overload taking your motherboard (if not more components) with it. An overdraw of power on the PSU or just a cheaply constructed PSU will easily blow taking some of the components with it (essentially killing the components).

Sorry if this is not the solution you were after. However, everything you described matches with either a power surge or a blown PSU. Always sad when perfectly good electronics get fried. Let me know if I can help you with anything else.

Mar 22, 2009 | Dell Dimension 9200 PC Desktop

3 Answers

OptiPlex GX270 fan starts and stops amber ligth goes on on motherboard


check this tread.. it could be your motherboard or a component on it that may not be working, try reseating everything connected to your motherboard ,then test.. try replacing the power supply and test.. then replace memory and test.. if no your motherboard or cpu are the problem
http://www.dellcommunity.com/supportforums/board/message?board.id=oplex_other&message.id=23925&c=us&l=en&cs=&s=gen

Sep 02, 2008 | Dell OptiPlex GX260 PC Desktop

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