Problem my pentium 4 motherboard first has a problem with the cpu fan spining slowly then i replace, now 3 capacitors near the processor are fat & board blow my power supply. i replace capacitors with new ones with same value and new power supply but my motherboard can't switch on even the cpu fan can't spin. Please assist. Thank you in advance my email is "email@example.com
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IF, the Electrolytic Capacitors were failing in the motherboard voltage regulator circuit, that regulates voltage to the Processor; you would think the voltage regulator circuit would support the Core2 Duo, before it would support the older Pentium 4.
However you may want to closely inspect the Electrolytic Capacitors surrounding the processor socket.
These are NOT the only capacitors in the circuit, that regulate voltage for the Processor.
If you read the article from Hardwaresecrets, you will see how to find all of them.
This is what happens, when Electrolytic Capacitors in the motherboard voltage regulator circuit, (For the Processor), go bad,
The bottom example with a blue plastic sleeve, is the Radial design. The top example is an Axial design. The leads come out of both ends.
In the example above there is a blue plastic sleeve, over an aluminum case. The case resembles a 'Coke-Cola- can with the top, and bottom removed.
The top is a thin flat round disk. It has a shape etched partway into it. The shape is usually an X, or a lK.
The bottom is called a Bung. It is a synthetic rubber flat round disk. The leads coming from the metal strips inside, poke through it.
Inside the case are 3 strips. A) One is a thin, aluminum 'foil'. It is the Conducting Strip, and the Positive lead is connected to it.
B) One is a thin, aluminum 'foil', and has a non-conducting medium applied to it. It is the Non-Conducting Strip, and has the Negative lead connected to it.
C) The last strip is a paper-like substance, and is soaked with Electrolytic Paste.
The paper-like strip is laid in-between the two metal strips, and all three strips are rolled up tightly.
When the capacitor starts to fail, the Electrolytic Paste inside starts to develop a gas. Hydrogen gas. The gas expands, and pushes against the seals of the case.
(Top disk, and synthetic rubber Bung)
The top disk's X, or lK will split open, and paste will slowly ooze out. Or the rubber Bung will have one edge poked out of the case, and paste will slowly ooze out.
So much paste loss, and the capacitor operates at a weakened state. TOO much paste loss, and the capacitor fails.
(A Capacitor is designed to slowly build up a charge, then release it all at once. Crude comparison, is a large swimming pool slowly filled by a garden hose, then one wall of the pool is taken down all at once.
Some cameras use capacitors for the flash unit )
It isn't so much that the computer isn't giving a display. The reason for no display, is that the computer isn't working, in order to send out a video signal. (No Signal)
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Intel LGA775 Pentium 4 CPU This motherboard supports the latest Pentium 4 CPU from Intel in LGA775 package. With 800MHz FSB, 1 MB L2 cache, Hyper-Threading Technology and core-speeds up to 3.6GHz and beyond, Intel's LGA775 Pentium 4 is one of the fastest desktop processors to date.
Hi oilian, Be glad it did shut down. If it didn't, your new CPU could haveover heated. There are a few reasons for a CPU to over heat. 1.) There is no thermal grease or too little on the heat-sink assembly. 2.) The old thermal grease was not removed or the old thermal tape was not removed. 3.) The heat-sink assembly was not cleaned completely with alcohol before applying new thermal grease. 4.) The CPU fan is running too slowly. 5.) The heat-sink fins are possibly filled with dust build-up & the CPU fan can not cool the heat-sink assembly. Boot to the bios & go to Hardware Monitor. There you can check voltage, CPU fan speed, CPU temp & other bios monitored settings.
When you say power is going to the mobo, are other fans and lights turning on? You also may have forgotten to plug in the large ATX power cord from the PSU, or the smaller 4-pin rectangular 12V power cord. Is the correct local voltage setting for your PSU selected (110 or 220)?