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Symptom k7s5a shuts down after 1 second

After blackout. Changed PSU... same symptom. If all disconnected (disks, pci slots, etc) except Mobo, cpu, ram ... same symptom; reset cmos... same symptom. Hardware troubleshooting needed; e.g. bad caps? some burnt component?

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2) Starts at 0:04,


However, the Electrolytic Paste inside the Radial Aluminum Electrolytic Capacitors; can also dry up, and show no outward visual signs of damage.

4) If the Thermal Paste (Or Thermal Pad), has dried up in-between the Processor, and Heatsink. you can see the same.


Posted on Dec 03, 2012

  • 7 more comments 
  • Juan Barreto Dec 04, 2012

    Thank you for the links, specially Looking forward for next weekend to replace all the 2200uF capacitors around the chokes and mosfets

  • joecoolvette
    joecoolvette Dec 05, 2012

    You're welcome Juan, and thank you for the rating! 1) 2) 3) 4)

  • Juan Barreto Dec 06, 2012

    Not only Gluxon capacitors, a big mosfet L3103S is short-circuit (removed and verified; i have replacement). It seems that one additional small surface transistor (SOT23 packaging) is damaged too. Its labeled "1P", other aside is labeled "2F". How can I find the complete code? Could be IRLML9301 but not sure. Thanks for ANY hint to find and solve this.

  • Juan Barreto Dec 06, 2012

    Found :-) 1P = FMMT2222A (NPN), 2F = FMMT2907A (PNP)

  • joecoolvette
    joecoolvette Dec 06, 2012

    Excellent job Juan! I'm following right along. You should try motherboard component level repair, for other people too. They could use your knowledge, and you may be able to save them loads of money. Just my 2Cents. Regards, joecoolvette

  • Juan Barreto Dec 06, 2012

    Hello... it worked!! completely. In fact i'm posting from the repaired PC :-) Resuming a) Replaced 11 x Gluxon capacitors, several were bulged b) Replaced 1 mosfet IRL3103S (smd) with equivalent IRF3205 (TO-220 case) with a heatsink; c) Replaced small driver labeled "1P" (smd) with 2N2222A (TO-18 case). I first turned on with only CPU, RAM and ATX conector to Mobo, same original PSU; it didn't shut off :-) and beeped (expected). Then I plugged PCI, hard disks, etc Then beeped again, lost CMOS (expected). Then plugged all: keyboard, monitor,etc, entered BIOS to see voltages... all normal. Once reconfigured cmos, booted, windows, tested disks, temperatures, etc ALL normal so far. I hope this stands up a couple of years :-)

  • joecoolvette
    joecoolvette Dec 07, 2012

    Years ago a Capacitor Plague happened. It is still affecting us today, A tale of revenge, and espionage. Lab tech is fired from major Japanese electrolytic capacitor company. Felt wrongly fired, a female co-worker decides to steal the heavily guarded electrolytic paste formula. She was found out beforehand, and given a bogus formula. Formula doesn't have ingredient/s needed to hold down Electrolytic Paste gas formulation. Formula is taken to another country, and this manufacturer manufacturers Thousands, upon thousands of bad capacitors. Also if an electronic unit sits around not plugged into power, for a trickle charge to those 'Caps', the Electrolytic Paste chemically breaks down. My guess is that those 1200uf caps are in the motherboard voltage regulator circuit, and without regulated needed voltage to the Power MOSFET, the Gate/Source was too high, and smoked the IRL3103S Power MOSFET. The rest were just 'dominos' in the circuit 'chain'. And now back to you Bobby.............................................

  • Juan Barreto Dec 11, 2012

    Yes, I'd seen that Wikipedia entry. Interesting story. In fact, it's not the first time I repair something just replacing bad caps... I repaired 2 years ago an ADSL WiFi Router just replacing 4 10uF capacitors.

  • joecoolvette
    joecoolvette Dec 12, 2012

    Interesting Juan, about the ADSL router. AT&T wireless routers had a problem with the Electrolytic 'Cap's. Capacitance was correct, but Voltage value was too low. I believe it went from 16 Volts to 24 Volts, but don't quote me. Been a long time since I replaced caps in an AT&T router, and read the information I just stated. (May have been 20 Volt) Wikipedia entry? Yes. the added info I added, may not be found on the 'net anymore. Made a certain country look bad, and it's resident Electrolytic Capacitor manufacturer/s. (This is also why Japanese Electrolytic Capacitors are looked on with great favor)


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SOURCE: CPu fan turns for 1 second and then stops.

If all was working fine before, then, you have either not connected the cpu power cable, as is sometimes required other than being powered by the processor socket, or your power supply unit is not pentium 4 compatable and is unable to power the processor.

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SOURCE: P4i65G - brand new want start.

What kind of P4 3.4Ghz is it? if it has 2mb of L3 cache, it doesn't work with that motherboard

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SOURCE: shutting down then starting back up whenever

Ya. If it keeps re-booting then it may be a virus (my things virus)
If not, go to system properties and start up and recovery settings. remove reboot on error settings (in XP) It doesnt fix the root cause but may stop your frustration

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Posted on Jun 18, 2008

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SOURCE: NO video @ bootup

Are you sure that the memory you have installed is compatible with your motherboard.

It is weired but some memory do not work with certain motherboards, irespective of speed or voltage rating.

Posted on Aug 05, 2008

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Motherboard booting problems...How do I solve?


Try to boot with 1 stick of ram then swap it with the other and try again. Next unplug the case front connections from the mobo header (pins). Draw a sketch where they all go so you don't forget. I'm talking about the power switch, reset SW, HDD LED etc. Also remove anything connected to the back panel printers etc. Also remove the mouse and keyboard. Carefully, momentarily short the pins that were connected to the power switch and note results.

If it still doesn't boot, remove all parts from the mobo except 1 Stick of RAM, graphics card, PSU, and of course CPU. Leave the mouse and keyboard unplugged. Try to boot by shorting the mobo pins again. If it doesn't boot it is most likely either the PSU or the mobo. It could also be the CPU or RAM but it is less likely.

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I have a Compaq Presario SR1830NX desktop, I leave it on all the time, when I got up this morning, it was off, so I pressed the power button, but it doesn't power on, nothing happens.. I checked the power...

step 2 the TECH uses a voltmeter and checks all wires on PSU for correct voltage.

PSU in Desktop dead, my guess fans dead too right>
you never said, what it does inside PC ,except nothing
does nothing mean dead silence?
the fan must run for 1second, then goes off.
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15 and 16?
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There are 2 causes, of dead power button.
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3: the MOBO is bad.

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the power good pin, does that #8,
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pull all power cables there, hdd, power, cdrom.
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in most cases, the PSU is bad. but not always.

This is a feature, of ATX it keeps you from blowing up say a
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When I turn on the computer it starts to beep every four or five seconds; it doesn't even turn on the screen. The display at the motherboard is "04". What does it mean? There was nothing wrong with my...

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Computer in black screen, no energy outputted

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