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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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  • Master
  • 5,660 Answers

1) http://capacitorlab.com/visible-failures/index.htm

2) Starts at 0:04,

http://www.youtube.com/watch?v=KN6_-8fYHo0

3) http://www.hardwaresecrets.com/article/616

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.

Regards,
joecoolvette

Posted on Dec 03, 2012

  • 7 more comments 
  • Juan Barreto Dec 04, 2012

    Thank you for the links, specially hardwaresecrets.com. 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)http://www.hardwaresecrets.com/article/H... 2)http://www.youtube.com/watch?v=YCSNWi3UH... 3)http://www.mouser.com/Passive-Components... 4)http://www.radioshack.com/product/index....

  • 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)http://www.repairfaq.org/REPAIR/F_SMD_tr...

  • 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,http://en.wikipedia.org/wiki/Capacitor_p... 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)http://www.hardwaresecrets.com/article/H...http://www.hardwaresecrets.com/article/6...

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